{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "needle-roller-bearings-nk-rna-nks",
 "name": "Needle roller bearings NK, NKS, RNA4900 (NK10/16, NK20/20, RNA4904 and more): Fw, OD, width, r min + 14 ring-envelope STEP/STL files",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the dimensions of an NK 10/16, NK 20/20, RNA4900, RNA4904 or RNA4905 needle roller bearing: roller-set bore Fw, outside diameter, width and chamfer?",
 "tags": [
  "needle roller bearing",
  "NK",
  "NKS",
  "RNA4900",
  "RNA4904",
  "machined needle bearing",
  "needle bearing without inner ring",
  "Fw",
  "ring envelope"
 ],
 "aliases": [
  "NK10/16 dimensions",
  "NK 12/16 dimensions",
  "NK15/16 dimensions",
  "NK20/20 dimensions",
  "NK25/20 dimensions",
  "NK30/30 dimensions",
  "RNA4900 dimensions",
  "RNA4901 dimensions",
  "RNA4902 dimensions",
  "RNA4904 dimensions",
  "RNA4905 dimensions",
  "RNA4906 dimensions",
  "NKS25 dimensions",
  "NK 10/16 10x17x16",
  "NK 20/20 20x28x20",
  "RNA4900 14x22x13",
  "needle bearing without inner ring stl",
  "needle roller bearing step",
  "NK vs RNA needle bearing",
  "needle bearing Fw meaning",
  "NK needle bearing sizes",
  "RNA49 and RNA69 needle bearing"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 14,
 "url": "https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/",
 "sheet_txt": "https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/sheet.txt",
 "sheet": {
  "basis": "Koyo (JTEKT) machined needle roller catalogue rows (Fw, D, C, r min) checked against Emerson Bearing NK and RNA 4900 lists; Nose Seiko (JNS) used for the r min disagreement; McMaster-Carr needle bearings linked",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "NK, NKS and RNA bearings are machined-ring needle roller bearings without an inner ring: the needles run directly on a hardened shaft (or on an IR / LRT inner ring). Fw is the diameter of the circle inscribed to the needles, so the shaft or inner ring raceway must be Fw (tolerance F6-type fit, see the maker's catalogue). NK has a plain outer ring, NKS a wider-OD (heavier) ring, RNA49 and RNA69 the 49 and 69 dimension series (RNA69 is the wide one). With the matching inner ring they become NKI / NA.",
   "Numbers: Koyo (JTEKT) machined-ring needle roller catalogue pages (Fw, D, C, r min). Independent check on Fw, D and C: Emerson Bearing's NK list (every one of the 25 rows read matches a Koyo row) and RNA 4900 list (the ten rows that Koyo also has agree, except RNA4906). Disagreements kept: RNA4906 is 18 mm wide in Koyo and 17 mm in Emerson; the four smallest rows NK5/10, NK5/12, NK6/10, NK6/12 have r min 0.2 in Koyo and 0.15 in Nose Seiko (JNS) (no file is made for them). Emerson's page lists NK5/10 under the name NK 5/12 TN (its C is 10).",
   "RNA4907 to RNA4922 are Emerson-only rows (Fw, D, C, no r min); NK / NKS rows above NK40 were not read. The mid-size 'A' versions are the current ones; the Koyo table names are given as printed (A, TN and other suffixes only differ in cage or tolerance details that are not in this table).",
   "Files: 14 ring envelopes with r min from Koyo (NK8/12, NK10/16TN, NK12/16, NK15/16A, NK20/20A, NK25/20A, NK30/30A, RNA4900, RNA4902, RNA4904, RNA4905, RNA6905A, NKS25A, RNA49/32): one solid ring, bore Fw, OD D, width C, corners rounded at r min. No needles, cage, oil hole or groove.",
   "Left out: load ratings and speeds (the makers differ), NKI / NA with-inner-ring types (see the IR page for the rings), RNA48 and RNA59, NQ series, sizes above 40 mm shaft with r min, drawn-cup HK / BK (separate page)."
  ],
  "table": {
   "columns": [
    "bearing",
    "roller-set bore Fw, mm",
    "OD D, mm",
    "width C, mm",
    "r min, mm",
    "source"
   ],
   "rows": [
    [
     "NK5/10TN",
     "5",
     "10",
     "10",
     "0.2 (Koyo) / 0.15 (JNS)",
     "Koyo + Emerson; JNS differs in r min"
    ],
    [
     "NK5/12TN",
     "5",
     "10",
     "12",
     "0.2 (Koyo) / 0.15 (JNS)",
     "Koyo + Emerson; JNS differs in r min"
    ],
    [
     "NK6/10",
     "6",
     "12",
     "10",
     "0.2 (Koyo) / 0.15 (JNS)",
     "Koyo + Emerson; JNS differs in r min"
    ],
    [
     "NK6/12TN",
     "6",
     "12",
     "12",
     "0.2 (Koyo) / 0.15 (JNS)",
     "Koyo + Emerson; JNS differs in r min"
    ],
    [
     "NK7/10TN",
     "7",
     "14",
     "10",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK7/12TN",
     "7",
     "14",
     "12",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK8/12",
     "8",
     "15",
     "12",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK8/16",
     "8",
     "15",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK9/12",
     "9",
     "16",
     "12",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK9/16",
     "9",
     "16",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK10/12",
     "10",
     "17",
     "12",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK10/16TN",
     "10",
     "17",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK12/12A",
     "12",
     "19",
     "12",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK12/16",
     "12",
     "19",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA4900",
     "14",
     "22",
     "13",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK14/16A",
     "14",
     "22",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK14/20A",
     "14",
     "22",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK15/16A",
     "15",
     "23",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK15/20A",
     "15",
     "23",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA4901",
     "16",
     "24",
     "13",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK16/16A",
     "16",
     "24",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK16/20A",
     "16",
     "24",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA6901",
     "16",
     "24",
     "22",
     "0.3",
     "Koyo"
    ],
    [
     "NK17/16A",
     "17",
     "25",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK17/20A",
     "17",
     "25",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK18/16A",
     "18",
     "26",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK18/20A",
     "18",
     "26",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NKS18A",
     "18",
     "30",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK19/16A",
     "19",
     "27",
     "16",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK19/20A",
     "19",
     "27",
     "20",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA4902",
     "20",
     "28",
     "13",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK20/16A",
     "20",
     "28",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK20/20A",
     "20",
     "28",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "RNA6902A",
     "20",
     "28",
     "23",
     "0.3",
     "Koyo"
    ],
    [
     "NKS20A",
     "20",
     "32",
     "20",
     "0.6",
     "Koyo"
    ],
    [
     "NK21/16A",
     "21",
     "29",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK21/20A",
     "21",
     "29",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "RNA4903",
     "22",
     "30",
     "13",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "NK22/16A",
     "22",
     "30",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK22/20A",
     "22",
     "30",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "RNA6903A",
     "22",
     "30",
     "23",
     "0.3",
     "Koyo"
    ],
    [
     "NKS22A",
     "22",
     "35",
     "20",
     "0.6",
     "Koyo"
    ],
    [
     "NK24/16A",
     "24",
     "32",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK24/20A",
     "24",
     "32",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NKS24A",
     "24",
     "37",
     "20",
     "0.6",
     "Koyo"
    ],
    [
     "NK25/16A",
     "25",
     "33",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK25/20A",
     "25",
     "33",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "RNA4904",
     "25",
     "37",
     "17",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA6904A",
     "25",
     "37",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS25A",
     "25",
     "38",
     "20",
     "0.6",
     "Koyo"
    ],
    [
     "NK26/16A",
     "26",
     "34",
     "16",
     "0.3",
     "Koyo"
    ],
    [
     "NK26/20A",
     "26",
     "34",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK28/20A",
     "28",
     "37",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK28/30A",
     "28",
     "37",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "RNA49/22",
     "28",
     "39",
     "17",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA69/22A",
     "28",
     "39",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS28A",
     "28",
     "42",
     "20",
     "0.6",
     "Koyo"
    ],
    [
     "NK29/20A",
     "29",
     "38",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK29/30A",
     "29",
     "38",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NK30/20A",
     "30",
     "40",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK30/30A",
     "30",
     "40",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "RNA4905",
     "30",
     "42",
     "17",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA6905A",
     "30",
     "42",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS30A",
     "30",
     "45",
     "22",
     "0.6",
     "Koyo"
    ],
    [
     "NK32/20A",
     "32",
     "42",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK32/30A",
     "32",
     "42",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "RNA49/28",
     "32",
     "45",
     "17",
     "0.3",
     "Koyo + Emerson"
    ],
    [
     "RNA69/28A",
     "32",
     "45",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS32A",
     "32",
     "47",
     "22",
     "0.6",
     "Koyo"
    ],
    [
     "NK35/20A",
     "35",
     "45",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK35/30A",
     "35",
     "45",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "RNA4906",
     "35",
     "47",
     "18 (Koyo) / 17 (Emerson)",
     "0.3",
     "Koyo; Emerson differs in C"
    ],
    [
     "RNA6906A",
     "35",
     "47",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS35A",
     "35",
     "50",
     "22",
     "0.6",
     "Koyo"
    ],
    [
     "NK37/20A",
     "37",
     "47",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK37/30A",
     "37",
     "47",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NKS37A",
     "37",
     "52",
     "22",
     "0.6",
     "Koyo"
    ],
    [
     "NK38/20A",
     "38",
     "48",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK38/30A",
     "38",
     "48",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "NK40/20A",
     "40",
     "50",
     "20",
     "0.3",
     "Koyo"
    ],
    [
     "NK40/30A",
     "40",
     "50",
     "30",
     "0.3",
     "Koyo"
    ],
    [
     "RNA49/32",
     "40",
     "52",
     "20",
     "0.6",
     "Koyo + Emerson"
    ],
    [
     "RNA69/32A",
     "40",
     "52",
     "36",
     "0.6",
     "Koyo"
    ],
    [
     "NKS40A",
     "40",
     "55",
     "22",
     "0.6",
     "Koyo"
    ],
    [
     "RNA4907",
     "42",
     "55",
     "20",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4908",
     "48",
     "62",
     "22",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4909",
     "52",
     "68",
     "22",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4910",
     "58",
     "72",
     "22",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4911",
     "63",
     "80",
     "25",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4912",
     "68",
     "85",
     "25",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4913",
     "72",
     "90",
     "25",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4914",
     "80",
     "100",
     "30",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4915",
     "85",
     "105",
     "30",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4916",
     "90",
     "110",
     "30",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4917",
     "100",
     "120",
     "35",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4918",
     "105",
     "125",
     "35",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4919",
     "110",
     "130",
     "35",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4920",
     "115",
     "140",
     "40",
     "—",
     "Emerson (Fw, D, C only)"
    ],
    [
     "RNA4922",
     "125",
     "150",
     "40",
     "—",
     "Emerson (Fw, D, C only)"
    ]
   ]
  }
 },
 "sheet_text": "Needle roller bearings NK, NKS, RNA4900 (NK10/16, NK20/20, RNA4904 and more): Fw, OD, width, r min + 14 ring-envelope STEP/STL files — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/  (sheet CC BY 4.0)\nBasis: Koyo (JTEKT) machined needle roller catalogue rows (Fw, D, C, r min) checked against Emerson Bearing NK and RNA 4900 lists; Nose Seiko (JNS) used for the r min disagreement; McMaster-Carr needle bearings linked\nCatalog version: 2026-10-20\n\nSizes: see table below\n- NK, NKS and RNA bearings are machined-ring needle roller bearings without an inner ring: the needles run directly on a hardened shaft (or on an IR / LRT inner ring). Fw is the diameter of the circle inscribed to the needles, so the shaft or inner ring raceway must be Fw (tolerance F6-type fit, see the maker's catalogue). NK has a plain outer ring, NKS a wider-OD (heavier) ring, RNA49 and RNA69 the 49 and 69 dimension series (RNA69 is the wide one). With the matching inner ring they become NKI / NA.\n- Numbers: Koyo (JTEKT) machined-ring needle roller catalogue pages (Fw, D, C, r min). Independent check on Fw, D and C: Emerson Bearing's NK list (every one of the 25 rows read matches a Koyo row) and RNA 4900 list (the ten rows that Koyo also has agree, except RNA4906). Disagreements kept: RNA4906 is 18 mm wide in Koyo and 17 mm in Emerson; the four smallest rows NK5/10, NK5/12, NK6/10, NK6/12 have r min 0.2 in Koyo and 0.15 in Nose Seiko (JNS) (no file is made for them). Emerson's page lists NK5/10 under the name NK 5/12 TN (its C is 10).\n- RNA4907 to RNA4922 are Emerson-only rows (Fw, D, C, no r min); NK / NKS rows above NK40 were not read. The mid-size 'A' versions are the current ones; the Koyo table names are given as printed (A, TN and other suffixes only differ in cage or tolerance details that are not in this table).\n- Files: 14 ring envelopes with r min from Koyo (NK8/12, NK10/16TN, NK12/16, NK15/16A, NK20/20A, NK25/20A, NK30/30A, RNA4900, RNA4902, RNA4904, RNA4905, RNA6905A, NKS25A, RNA49/32): one solid ring, bore Fw, OD D, width C, corners rounded at r min. No needles, cage, oil hole or groove.\n- Left out: load ratings and speeds (the makers differ), NKI / NA with-inner-ring types (see the IR page for the rings), RNA48 and RNA59, NQ series, sizes above 40 mm shaft with r min, drawn-cup HK / BK (separate page).\n\nbearing  roller-set bore Fw, mm  OD D, mm  width C, mm  r min, mm  source\nNK5/10TN  5  10  10  0.2 (Koyo) / 0.15 (JNS)  Koyo + Emerson; JNS differs in r min\nNK5/12TN  5  10  12  0.2 (Koyo) / 0.15 (JNS)  Koyo + Emerson; JNS differs in r min\nNK6/10  6  12  10  0.2 (Koyo) / 0.15 (JNS)  Koyo + Emerson; JNS differs in r min\nNK6/12TN  6  12  12  0.2 (Koyo) / 0.15 (JNS)  Koyo + Emerson; JNS differs in r min\nNK7/10TN  7  14  10  0.3  Koyo + Emerson\nNK7/12TN  7  14  12  0.3  Koyo + Emerson\nNK8/12  8  15  12  0.3  Koyo + Emerson\nNK8/16  8  15  16  0.3  Koyo + Emerson\nNK9/12  9  16  12  0.3  Koyo + Emerson\nNK9/16  9  16  16  0.3  Koyo + Emerson\nNK10/12  10  17  12  0.3  Koyo + Emerson\nNK10/16TN  10  17  16  0.3  Koyo + Emerson\nNK12/12A  12  19  12  0.3  Koyo + Emerson\nNK12/16  12  19  16  0.3  Koyo + Emerson\nRNA4900  14  22  13  0.3  Koyo + Emerson\nNK14/16A  14  22  16  0.3  Koyo + Emerson\nNK14/20A  14  22  20  0.3  Koyo + Emerson\nNK15/16A  15  23  16  0.3  Koyo + Emerson\nNK15/20A  15  23  20  0.3  Koyo + Emerson\nRNA4901  16  24  13  0.3  Koyo + Emerson\nNK16/16A  16  24  16  0.3  Koyo + Emerson\nNK16/20A  16  24  20  0.3  Koyo + Emerson\nRNA6901  16  24  22  0.3  Koyo\nNK17/16A  17  25  16  0.3  Koyo + Emerson\nNK17/20A  17  25  20  0.3  Koyo + Emerson\nNK18/16A  18  26  16  0.3  Koyo + Emerson\nNK18/20A  18  26  20  0.3  Koyo + Emerson\nNKS18A  18  30  16  0.3  Koyo\nNK19/16A  19  27  16  0.3  Koyo + Emerson\nNK19/20A  19  27  20  0.3  Koyo + Emerson\nRNA4902  20  28  13  0.3  Koyo + Emerson\nNK20/16A  20  28  16  0.3  Koyo\nNK20/20A  20  28  20  0.3  Koyo\nRNA6902A  20  28  23  0.3  Koyo\nNKS20A  20  32  20  0.6  Koyo\nNK21/16A  21  29  16  0.3  Koyo\nNK21/20A  21  29  20  0.3  Koyo\nRNA4903  22  30  13  0.3  Koyo + Emerson\nNK22/16A  22  30  16  0.3  Koyo\nNK22/20A  22  30  20  0.3  Koyo\nRNA6903A  22  30  23  0.3  Koyo\nNKS22A  22  35  20  0.6  Koyo\nNK24/16A  24  32  16  0.3  Koyo\nNK24/20A  24  32  20  0.3  Koyo\nNKS24A  24  37  20  0.6  Koyo\nNK25/16A  25  33  16  0.3  Koyo\nNK25/20A  25  33  20  0.3  Koyo\nRNA4904  25  37  17  0.3  Koyo + Emerson\nRNA6904A  25  37  30  0.3  Koyo\nNKS25A  25  38  20  0.6  Koyo\nNK26/16A  26  34  16  0.3  Koyo\nNK26/20A  26  34  20  0.3  Koyo\nNK28/20A  28  37  20  0.3  Koyo\nNK28/30A  28  37  30  0.3  Koyo\nRNA49/22  28  39  17  0.3  Koyo + Emerson\nRNA69/22A  28  39  30  0.3  Koyo\nNKS28A  28  42  20  0.6  Koyo\nNK29/20A  29  38  20  0.3  Koyo\nNK29/30A  29  38  30  0.3  Koyo\nNK30/20A  30  40  20  0.3  Koyo\nNK30/30A  30  40  30  0.3  Koyo\nRNA4905  30  42  17  0.3  Koyo + Emerson\nRNA6905A  30  42  30  0.3  Koyo\nNKS30A  30  45  22  0.6  Koyo\nNK32/20A  32  42  20  0.3  Koyo\nNK32/30A  32  42  30  0.3  Koyo\nRNA49/28  32  45  17  0.3  Koyo + Emerson\nRNA69/28A  32  45  30  0.3  Koyo\nNKS32A  32  47  22  0.6  Koyo\nNK35/20A  35  45  20  0.3  Koyo\nNK35/30A  35  45  30  0.3  Koyo\nRNA4906  35  47  18 (Koyo) / 17 (Emerson)  0.3  Koyo; Emerson differs in C\nRNA6906A  35  47  30  0.3  Koyo\nNKS35A  35  50  22  0.6  Koyo\nNK37/20A  37  47  20  0.3  Koyo\nNK37/30A  37  47  30  0.3  Koyo\nNKS37A  37  52  22  0.6  Koyo\nNK38/20A  38  48  20  0.3  Koyo\nNK38/30A  38  48  30  0.3  Koyo\nNK40/20A  40  50  20  0.3  Koyo\nNK40/30A  40  50  30  0.3  Koyo\nRNA49/32  40  52  20  0.6  Koyo + Emerson\nRNA69/32A  40  52  36  0.6  Koyo\nNKS40A  40  55  22  0.6  Koyo\nRNA4907  42  55  20  —  Emerson (Fw, D, C only)\nRNA4908  48  62  22  —  Emerson (Fw, D, C only)\nRNA4909  52  68  22  —  Emerson (Fw, D, C only)\nRNA4910  58  72  22  —  Emerson (Fw, D, C only)\nRNA4911  63  80  25  —  Emerson (Fw, D, C only)\nRNA4912  68  85  25  —  Emerson (Fw, D, C only)\nRNA4913  72  90  25  —  Emerson (Fw, D, C only)\nRNA4914  80  100  30  —  Emerson (Fw, D, C only)\nRNA4915  85  105  30  —  Emerson (Fw, D, C only)\nRNA4916  90  110  30  —  Emerson (Fw, D, C only)\nRNA4917  100  120  35  —  Emerson (Fw, D, C only)\nRNA4918  105  125  35  —  Emerson (Fw, D, C only)\nRNA4919  110  130  35  —  Emerson (Fw, D, C only)\nRNA4920  115  140  40  —  Emerson (Fw, D, C only)\nRNA4922  125  150  40  —  Emerson (Fw, D, C only)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Koyo (JTEKT), via AIMS Industrial: Machined needle roller bearings without inner ring (catalogue pages 147 to 151): Fw, D, C, r min for NK, NKS, RNA49, RNA69 — web — Publisher's page; dimensions are facts — https://aimsindustrial.com.au/cdn/shop/files/Koyo-Machined-Needle-Roller-Bearings-without-Inner-Ring-Catalogue-Pages-147-to-151-Selected.pdf\n- Nose Seiko (JNS): Machined ring needle roller bearings without inner ring, NK / RNA catalogue pages 60 to 77 (Fw, D, C, rs min) — web — Publisher's page; dimensions are facts — https://www.albeco.com.pl/data/catalogueb/rna_nk_jns.pdf\n- Emerson Bearing: NK style standard needle roller bearings without inner ring: Fw, D, C — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/viewitems/standard-needle-roller-bearings/nk-style-standard-needle-roller-bearings?plpver=10\n- Emerson Bearing: RNA 4900 standard needle roller bearings without inner ring: Fw, D, C — web — Publisher's page; dimensions are facts — https://products.emersonbearing.com/printitems/standard-needle-roller-bearings/rna-4900-standard-needle-roller-bearings?plpver=10\n- McMaster-Carr: Needle bearings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/needle-bearings\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 14 parts): https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/index.json\nAPI: https://xemstudio.com/api/geometry?object=needle-roller-bearings-nk-rna-nks\n",
 "sources": [
  {
   "publisher": "Koyo (JTEKT), via AIMS Industrial",
   "title": "Machined needle roller bearings without inner ring (catalogue pages 147 to 151): Fw, D, C, r min for NK, NKS, RNA49, RNA69",
   "url": "https://aimsindustrial.com.au/cdn/shop/files/Koyo-Machined-Needle-Roller-Bearings-without-Inner-Ring-Catalogue-Pages-147-to-151-Selected.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Nose Seiko (JNS)",
   "title": "Machined ring needle roller bearings without inner ring, NK / RNA catalogue pages 60 to 77 (Fw, D, C, rs min)",
   "url": "https://www.albeco.com.pl/data/catalogueb/rna_nk_jns.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Emerson Bearing",
   "title": "NK style standard needle roller bearings without inner ring: Fw, D, C",
   "url": "https://products.emersonbearing.com/viewitems/standard-needle-roller-bearings/nk-style-standard-needle-roller-bearings?plpver=10",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Emerson Bearing",
   "title": "RNA 4900 standard needle roller bearings without inner ring: Fw, D, C",
   "url": "https://products.emersonbearing.com/printitems/standard-needle-roller-bearings/rna-4900-standard-needle-roller-bearings?plpver=10",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Needle bearings (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/needle-bearings",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "needle-roller-bearing-inner-rings-ir-lrt",
  "needle-roller-bearings-hk-series",
  "one-way-clutch-bearings-hf-series",
  "thrust-ball-bearings-51100-series",
  "thrust-ball-bearings-51200-51300-series",
  "cylindrical-roller-bearings-nu2xx-nu3xx",
  "deep-groove-ball-bearings-series",
  "ball-bearings-metric"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [],
 "faq": [
  {
   "q": "What are the dimensions of an NK 10/16 needle bearing?",
   "a": "Roller-set bore Fw 10, OD 17, width 16 mm, r min 0.3 (Koyo and Emerson agree)."
  },
  {
   "q": "What are the dimensions of an RNA4900?",
   "a": "Fw 14, OD 22, width 13 mm, r min 0.3."
  },
  {
   "q": "What are the dimensions of an NK 20/20?",
   "a": "Fw 20, OD 28, width 20 mm (the Koyo name is NK20/20A)."
  },
  {
   "q": "What does Fw mean on a needle bearing?",
   "a": "Fw is the diameter of the circle inscribed to the needles: the shaft (or inner ring) raceway has to be that size, because the bearing has no inner ring of its own."
  },
  {
   "q": "Do the makers agree on RNA4906?",
   "a": "No: Koyo gives a width of 18 mm and Emerson 17 mm, with the same 35 mm Fw and 47 mm OD; check the maker's drawing before relying on the width."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "NK8-12-needle-roller-bearing-envelope-8x15x12",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK8-12-needle-roller-bearing-envelope-8x15x12.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK8-12-needle-roller-bearing-envelope-8x15x12.stl",
   "note": "NK8/12 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø8, OD Ø15, width 12; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK10-16TN-needle-roller-bearing-envelope-10x17x16",
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK10-16TN-needle-roller-bearing-envelope-10x17x16.stl",
   "note": "NK10/16TN needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø10, OD Ø17, width 16; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK12-16-needle-roller-bearing-envelope-12x19x16",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK12-16-needle-roller-bearing-envelope-12x19x16.stl",
   "note": "NK12/16 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø12, OD Ø19, width 16; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK15-16A-needle-roller-bearing-envelope-15x23x16",
   "formats": [
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK15-16A-needle-roller-bearing-envelope-15x23x16.stl",
   "note": "NK15/16A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø15, OD Ø23, width 16; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK20-20A-needle-roller-bearing-envelope-20x28x20",
   "formats": [
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK20-20A-needle-roller-bearing-envelope-20x28x20.stl",
   "note": "NK20/20A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø20, OD Ø28, width 20; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK25-20A-needle-roller-bearing-envelope-25x33x20",
   "formats": [
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK25-20A-needle-roller-bearing-envelope-25x33x20.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK25-20A-needle-roller-bearing-envelope-25x33x20.stl",
   "note": "NK25/20A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø25, OD Ø33, width 20; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NK30-30A-needle-roller-bearing-envelope-30x40x30",
   "formats": [
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   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK30-30A-needle-roller-bearing-envelope-30x40x30.stl",
   "note": "NK30/30A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø30, OD Ø40, width 30; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA4900-needle-roller-bearing-envelope-14x22x13",
   "formats": [
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4900-needle-roller-bearing-envelope-14x22x13.stl",
   "note": "RNA4900 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø14, OD Ø22, width 13; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA4902-needle-roller-bearing-envelope-20x28x13",
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   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4902-needle-roller-bearing-envelope-20x28x13.stl",
   "note": "RNA4902 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø20, OD Ø28, width 13; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA4904-needle-roller-bearing-envelope-25x37x17",
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   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4904-needle-roller-bearing-envelope-25x37x17.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4904-needle-roller-bearing-envelope-25x37x17.stl",
   "note": "RNA4904 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø25, OD Ø37, width 17; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA4905-needle-roller-bearing-envelope-30x42x17",
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   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4905-needle-roller-bearing-envelope-30x42x17.stl",
   "note": "RNA4905 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø30, OD Ø42, width 17; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA6905A-needle-roller-bearing-envelope-30x42x30",
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   ],
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA6905A-needle-roller-bearing-envelope-30x42x30.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA6905A-needle-roller-bearing-envelope-30x42x30.stl",
   "note": "RNA6905A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø30, OD Ø42, width 30; one solid ring, corners rounded at r min 0.3; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "NKS25A-needle-roller-bearing-envelope-25x38x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NKS25A-needle-roller-bearing-envelope-25x38x20.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NKS25A-needle-roller-bearing-envelope-25x38x20.stl",
   "note": "NKS25A needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø25, OD Ø38, width 20; one solid ring, corners rounded at r min 0.6; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  },
  {
   "file": "RNA49-32-needle-roller-bearing-envelope-40x52x20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA49-32-needle-roller-bearing-envelope-40x52x20.step",
   "stl": "https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA49-32-needle-roller-bearing-envelope-40x52x20.stl",
   "note": "RNA49/32 needle roller bearing (machined ring, no inner ring) envelope: roller-set bore Fw Ø40, OD Ø52, width 20; one solid ring, corners rounded at r min 0.6; the bore is the inscribed circle of the needles, not a machined bore; no needles, cage or lubrication hole; nominal values"
  }
 ],
 "markdown": "https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/index.md"
}