# Needle roller bearings NK, NKS, RNA4900 (NK10/16, NK20/20, RNA4904 and more): Fw, OD, width, r min + 14 ring-envelope STEP/STL files

> 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?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- 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
- Page: https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/ · JSON: https://xemstudio.com/api/geometry?object=needle-roller-bearings-nk-rna-nks · Plain text: https://xemstudio.com/objects/needle-roller-bearings-nk-rna-nks/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
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**Exact dimensions.** True size, with no tolerance added.

## 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).

## Sizes

| bearing | roller-set bore Fw, mm | OD D, mm | width C, mm | r min, mm | source |
|---|---|---|---|---|---|
| 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) |

## Where the files are

- 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](https://aimsindustrial.com.au/cdn/shop/files/Koyo-Machined-Needle-Roller-Bearings-without-Inner-Ring-Catalogue-Pages-147-to-151-Selected.pdf) — web — Publisher's page; dimensions are facts
- Nose Seiko (JNS): [Machined ring needle roller bearings without inner ring, NK / RNA catalogue pages 60 to 77 (Fw, D, C, rs min)](https://www.albeco.com.pl/data/catalogueb/rna_nk_jns.pdf) — web — Publisher's page; dimensions are facts
- Emerson Bearing: [NK style standard needle roller bearings without inner ring: Fw, D, C](https://products.emersonbearing.com/viewitems/standard-needle-roller-bearings/nk-style-standard-needle-roller-bearings?plpver=10) — web — Publisher's page; dimensions are facts
- Emerson Bearing: [RNA 4900 standard needle roller bearings without inner ring: Fw, D, C](https://products.emersonbearing.com/printitems/standard-needle-roller-bearings/rna-4900-standard-needle-roller-bearings?plpver=10) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Needle bearings (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/needle-bearings) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Free STEP/STL (14 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/index.json

- NK8-12-needle-roller-bearing-envelope-8x15x12: [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) — 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
- NK10-16TN-needle-roller-bearing-envelope-10x17x16: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK10-16TN-needle-roller-bearing-envelope-10x17x16.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK10-16TN-needle-roller-bearing-envelope-10x17x16.stl) — 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
- NK12-16-needle-roller-bearing-envelope-12x19x16: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK12-16-needle-roller-bearing-envelope-12x19x16.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK12-16-needle-roller-bearing-envelope-12x19x16.stl) — 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
- NK15-16A-needle-roller-bearing-envelope-15x23x16: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK15-16A-needle-roller-bearing-envelope-15x23x16.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK15-16A-needle-roller-bearing-envelope-15x23x16.stl) — 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
- NK20-20A-needle-roller-bearing-envelope-20x28x20: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK20-20A-needle-roller-bearing-envelope-20x28x20.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK20-20A-needle-roller-bearing-envelope-20x28x20.stl) — 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
- NK25-20A-needle-roller-bearing-envelope-25x33x20: [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) — 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
- NK30-30A-needle-roller-bearing-envelope-30x40x30: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK30-30A-needle-roller-bearing-envelope-30x40x30.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/NK30-30A-needle-roller-bearing-envelope-30x40x30.stl) — 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
- RNA4900-needle-roller-bearing-envelope-14x22x13: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4900-needle-roller-bearing-envelope-14x22x13.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4900-needle-roller-bearing-envelope-14x22x13.stl) — 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
- RNA4902-needle-roller-bearing-envelope-20x28x13: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4902-needle-roller-bearing-envelope-20x28x13.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4902-needle-roller-bearing-envelope-20x28x13.stl) — 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
- RNA4904-needle-roller-bearing-envelope-25x37x17: [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) — 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
- RNA4905-needle-roller-bearing-envelope-30x42x17: [STEP](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4905-needle-roller-bearing-envelope-30x42x17.step) · [STL](https://xemstudio.com/files/hardware/needle-roller-bearings-nk-rna-nks/RNA4905-needle-roller-bearing-envelope-30x42x17.stl) — 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
- RNA6905A-needle-roller-bearing-envelope-30x42x30: [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) — 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
- NKS25A-needle-roller-bearing-envelope-25x38x20: [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) — 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
- RNA49-32-needle-roller-bearing-envelope-40x52x20: [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) — 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

## Questions

**What are the dimensions of an NK 10/16 needle bearing?**

Roller-set bore Fw 10, OD 17, width 16 mm, r min 0.3 (Koyo and Emerson agree).

**What are the dimensions of an RNA4900?**

Fw 14, OD 22, width 13 mm, r min 0.3.

**What are the dimensions of an NK 20/20?**

Fw 20, OD 28, width 20 mm (the Koyo name is NK20/20A).

**What does Fw mean on a needle bearing?**

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.

**Do the makers agree on RNA4906?**

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.

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