{
 "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": "v-belts-classical-z-a-b-c-d-e",
 "name": "Classical V-belts Z, A, B, C, D, E (ISO 4184 / DIN 2215): top width, height, datum width and inside / datum length",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the width and height of an A, B or C section V-belt, and how is a belt's length measured (inside length vs pitch / datum length)?",
 "tags": [
  "v-belt",
  "classical v belt",
  "a section",
  "b section",
  "c section",
  "belt",
  "sheave",
  "iso 4184",
  "din 2215",
  "rma"
 ],
 "aliases": [
  "a section v belt dimensions",
  "b section v belt width",
  "c section v belt size",
  "classical v belt sizes",
  "v belt cross section dimensions",
  "a belt 13 x 8",
  "b belt 17 x 11",
  "c belt 22 x 14",
  "v belt top width height chart",
  "v belt pitch length vs inside length",
  "datum length v belt",
  "a68 belt length",
  "v belt size chart a b c d e",
  "z section v belt 10 x 6",
  "hi-power v belt dimensions",
  "classic v belt iso 4184"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/v-belts-classical-z-a-b-c-d-e/",
 "sheet_txt": "https://xemstudio.com/objects/v-belts-classical-z-a-b-c-d-e/sheet.txt",
 "sheet": {
  "basis": "Optibelt and ZZR (DIN 2215 / ISO 4184 widths, heights, datum widths), Gates and Tameson (rounded or differing sections), Dayco and ContiTech Li / Ld rows; disagreements shown, numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Classical (conventional) V-belts are the older wide section: Z, A, B, C, D, E in ISO 4184 / DIN 2215 and RMA IP-20 (the US also uses AX, BX, CX cogged and AA, BB, CC double-V). The letter stands for the section; in the metric designation the number after it is the nominal top width in mm (A/13, B/17, C/22). Top widths and heights are the numbers in the table; the datum width bd is the groove width at the belt's pitch line (the same numbers the ISO 4183 pulley-groove page uses: Z 8.5, A 11, B 14, C 19, D 27, E 32 mm).",
   "Sources: the Optibelt range sheet and ZZR Parts agree on the DIN 2215 widths and heights (Z 10 × 6, A 13 × 8, B 17 × 11, C 22 × 14, D 32 × 20, E 40 × 25). Gates' catalogue prints D 32 × 19 and E 38 × 25 (E top width 38 instead of 40); Tameson prints D 19 and E 40 × 25. Where they differ both are shown; the belt's maker catalogue is the authority for its own belt. Inch sections are as printed by VBeltSupply (A 1/2 × 5/16, B 21/32 × 7/16, C 7/8 × 17/32, D 1-1/4 × 3/4) and Tameson (B 13/32).",
   "Length conventions. Classical belts are sold by inside length Li (RMA: 'A68' = 68 in inside length, 'B75' = 75 in) or in the ISO / European system by datum length Ld (the length at the pitch line; 'pitch length' is the older name for the same thing). Ld = Li + an add-on that depends on the section. The add-ons below are what two brands print: Dayco (one example per section, Li to Ld, in mm): Z +25, A +33, B +40, C +59, D +76, E +81; ContiTech (every row read, constant per section): A +30 mm, B +45 mm. The two systems differ (A +33 vs +30, B +40 vs +45) and C to E add-ons come from one brand only, so use your belt maker's table, not a single add-on. Outside length La (measured with a tape over the top) is approximate; Aims Industrial gives Z 1, A 2, B 3, C 4, D 5, E 6 in as the outside-to-inside deduction.",
   "Not on this page: sizes between the sections (Y, 5, 8, 20, 25), the 40° belt-angle tolerance, per-length tables, tolerances and matching. McMaster-Carr's V-belt category is linked below for per-belt CAD.",
   "Li to Ld examples as printed: Z16DR (Dayco): Li 406 → Ld 431 mm (+25); A16DR (Dayco): Li 406 → Ld 439 mm (+33); B22DR (Dayco): Li 559 → Ld 599 mm (+40); C43DR (Dayco): Li 1092 → Ld 1151 mm (+59); D79DR (Dayco): Li 2007 → Ld 2083 mm (+76); E144DR (Dayco): Li 3658 → Ld 3739 mm (+81); A60 (ContiTech): Li 1525 → Ld 1555 mm (+30); A82 (ContiTech): Li 2083 → Ld 2113 mm (+30); A98 (ContiTech): Li 2500 → Ld 2530 mm (+30); B35 (ContiTech): Li 889 → Ld 934 mm (+45); B43 (ContiTech): Li 1090 → Ld 1135 mm (+45); B67 (ContiTech): Li 1700 → Ld 1745 mm (+45)."
  ],
  "table": {
   "columns": [
    "section (RMA letter / ISO width)",
    "top width b0, mm (DIN 2215 / ISO 4184 tables)",
    "datum width bd, mm (ZZR)",
    "height h, mm (ISO tables)",
    "Gates width × height, mm",
    "inch top width × height as printed",
    "differences between sources"
   ],
   "rows": [
    [
     "Z / 10",
     "10",
     "8.5",
     "6",
     "10 × 6",
     "3/8 × 1/4 (Tameson)",
     "Dayco Z16DR, Tameson 10 × 6"
    ],
    [
     "A / 13",
     "13",
     "11",
     "8",
     "13 × 8",
     "1/2 × 5/16 (VBeltSupply, Tameson)",
     "Dayco 'A: Profile (13mm X 8mm)'"
    ],
    [
     "B / 17",
     "17",
     "14",
     "11",
     "17 × 11",
     "21/32 × 7/16 (VBeltSupply); 21/32 × 13/32 (Tameson)",
     "the two inch heights differ: 7/16 in is 11.1 mm, 13/32 in is 10.3 mm"
    ],
    [
     "C / 22",
     "22",
     "19",
     "14",
     "22 × 14",
     "7/8 × 17/32 (VBeltSupply, Tameson)",
     "—"
    ],
    [
     "D / 32",
     "32",
     "27",
     "20 (Optibelt, ZZR); 19 (Gates, Tameson)",
     "32 × 19",
     "1-1/4 × 3/4 (VBeltSupply, Tameson)",
     "height 19 vs 20 mm: sources differ"
    ],
    [
     "E / 40",
     "40 (Optibelt, ZZR, Tameson); 38 (Gates)",
     "32",
     "25",
     "38 × 25",
     "1-1/2 × 29/32 (VBeltSupply, Tameson)",
     "top width 40 vs 38 mm: sources differ"
    ]
   ]
  }
 },
 "sheet_text": "Classical V-belts Z, A, B, C, D, E (ISO 4184 / DIN 2215): top width, height, datum width and inside / datum length — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/v-belts-classical-z-a-b-c-d-e/  (sheet CC BY 4.0)\nBasis: Optibelt and ZZR (DIN 2215 / ISO 4184 widths, heights, datum widths), Gates and Tameson (rounded or differing sections), Dayco and ContiTech Li / Ld rows; disagreements shown, numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Classical (conventional) V-belts are the older wide section: Z, A, B, C, D, E in ISO 4184 / DIN 2215 and RMA IP-20 (the US also uses AX, BX, CX cogged and AA, BB, CC double-V). The letter stands for the section; in the metric designation the number after it is the nominal top width in mm (A/13, B/17, C/22). Top widths and heights are the numbers in the table; the datum width bd is the groove width at the belt's pitch line (the same numbers the ISO 4183 pulley-groove page uses: Z 8.5, A 11, B 14, C 19, D 27, E 32 mm).\n- Sources: the Optibelt range sheet and ZZR Parts agree on the DIN 2215 widths and heights (Z 10 × 6, A 13 × 8, B 17 × 11, C 22 × 14, D 32 × 20, E 40 × 25). Gates' catalogue prints D 32 × 19 and E 38 × 25 (E top width 38 instead of 40); Tameson prints D 19 and E 40 × 25. Where they differ both are shown; the belt's maker catalogue is the authority for its own belt. Inch sections are as printed by VBeltSupply (A 1/2 × 5/16, B 21/32 × 7/16, C 7/8 × 17/32, D 1-1/4 × 3/4) and Tameson (B 13/32).\n- Length conventions. Classical belts are sold by inside length Li (RMA: 'A68' = 68 in inside length, 'B75' = 75 in) or in the ISO / European system by datum length Ld (the length at the pitch line; 'pitch length' is the older name for the same thing). Ld = Li + an add-on that depends on the section. The add-ons below are what two brands print: Dayco (one example per section, Li to Ld, in mm): Z +25, A +33, B +40, C +59, D +76, E +81; ContiTech (every row read, constant per section): A +30 mm, B +45 mm. The two systems differ (A +33 vs +30, B +40 vs +45) and C to E add-ons come from one brand only, so use your belt maker's table, not a single add-on. Outside length La (measured with a tape over the top) is approximate; Aims Industrial gives Z 1, A 2, B 3, C 4, D 5, E 6 in as the outside-to-inside deduction.\n- Not on this page: sizes between the sections (Y, 5, 8, 20, 25), the 40° belt-angle tolerance, per-length tables, tolerances and matching. McMaster-Carr's V-belt category is linked below for per-belt CAD.\n- Li to Ld examples as printed: Z16DR (Dayco): Li 406 → Ld 431 mm (+25); A16DR (Dayco): Li 406 → Ld 439 mm (+33); B22DR (Dayco): Li 559 → Ld 599 mm (+40); C43DR (Dayco): Li 1092 → Ld 1151 mm (+59); D79DR (Dayco): Li 2007 → Ld 2083 mm (+76); E144DR (Dayco): Li 3658 → Ld 3739 mm (+81); A60 (ContiTech): Li 1525 → Ld 1555 mm (+30); A82 (ContiTech): Li 2083 → Ld 2113 mm (+30); A98 (ContiTech): Li 2500 → Ld 2530 mm (+30); B35 (ContiTech): Li 889 → Ld 934 mm (+45); B43 (ContiTech): Li 1090 → Ld 1135 mm (+45); B67 (ContiTech): Li 1700 → Ld 1745 mm (+45).\n\nsection (RMA letter / ISO width)  top width b0, mm (DIN 2215 / ISO 4184 tables)  datum width bd, mm (ZZR)  height h, mm (ISO tables)  Gates width × height, mm  inch top width × height as printed  differences between sources\nZ / 10  10  8.5  6  10 × 6  3/8 × 1/4 (Tameson)  Dayco Z16DR, Tameson 10 × 6\nA / 13  13  11  8  13 × 8  1/2 × 5/16 (VBeltSupply, Tameson)  Dayco 'A: Profile (13mm X 8mm)'\nB / 17  17  14  11  17 × 11  21/32 × 7/16 (VBeltSupply); 21/32 × 13/32 (Tameson)  the two inch heights differ: 7/16 in is 11.1 mm, 13/32 in is 10.3 mm\nC / 22  22  19  14  22 × 14  7/8 × 17/32 (VBeltSupply, Tameson)  —\nD / 32  32  27  20 (Optibelt, ZZR); 19 (Gates, Tameson)  32 × 19  1-1/4 × 3/4 (VBeltSupply, Tameson)  height 19 vs 20 mm: sources differ\nE / 40  40 (Optibelt, ZZR, Tameson); 38 (Gates)  32  25  38 × 25  1-1/2 × 29/32 (VBeltSupply, Tameson)  top width 40 vs 38 mm: sources differ\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Optibelt: Belt range: classical V-belt table (DIN 2215 / ISO 4184 width b, height h, Li / Ld) and wedge / narrow belt tables — web — Publisher's page; dimensions are facts — https://santent.in/wp-content/uploads/2020/08/Optibelt-Belt-Range.pdf\n- ZZR Parts: Classic V-series (DIN 2215 / ISO 4184): top width bo, datum width bd, height h — web — Publisher's page; dimensions are facts — https://www.zzr-parts.com/?p=944\n- Gates (Statewide Bearings copy): Industrial V-belt catalogue: section widths and heights, datum and outside lengths — web — Publisher's page; dimensions are facts — https://www.statewidebearings.com.au/wp-content/uploads/2018/06/Gates-Industrial-V-Belts-1.pdf\n- VBeltSupply: Belt spec guide: inch top width x height for classical, 3V / 5V / 8V, SPZ to SPC; length designation examples — web — Publisher's page; dimensions are facts — https://www.vbeltsupply.com/media/wysiwyg/guides/belt-spec-guide.pdf\n- Tameson: V-belt size chart: top width and height of Z, A, B, C, D, E, 3V, 5V, 8V, SPZ, SPA, SPB, SPC — web — Publisher's page; dimensions are facts — https://tameson.com/v-belt-size-chart.html\n- Dayco: Industrial product guide: V-belt Li and Ld examples per section, A 13 x 8, 3V 9.5 x 8, SPA 13 x 10 — web — Publisher's page; dimensions are facts — https://na.daycoaftermarket.com/wp-content/uploads/IND-DR-VB-PG-0619-Industrial-Product-Guide.pdf\n- acorn-ind.co.uk (ContiTech listing): Wrapped classical V-belt rows with Li and Ld in mm (A, B) — web — Publisher's page; dimensions are facts — https://www.acorn-ind.co.uk/contitech/power-transmission/industrial-belts/v-belts/wrapped-classical-v-belts/?start=240\n- acorn-ind.co.uk (ContiTech listing): Wrapped classical V-belt rows with Li (in) and Ld (mm) — web — Publisher's page; dimensions are facts — https://www.acorn-ind.co.uk/power-transmission/industrial-belts/v-belts/wrapped-classical-v-belts/?start=600\n- Aims Industrial: How to measure a V-belt: Li, La, Ld definitions; narrow-section inside-to-pitch length additions — web — Publisher's page; dimensions are facts — https://aimsindustrial.com.au/blogs/product-guides/blog-how-to-measure-a-v-belt\n- ISO: ISO 4184:2025 Belt drives, classical and narrow V-belts, lengths in datum system (standard; sold, not reproduced) — standard — ISO; dimensions are facts [verify license at link] — https://www.iso.org/standard/88704.html\n- McMaster-Carr: V-belts (classical, narrow, banded) (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/c81-v-belts\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=v-belts-classical-z-a-b-c-d-e\n",
 "sources": [
  {
   "publisher": "Optibelt",
   "title": "Belt range: classical V-belt table (DIN 2215 / ISO 4184 width b, height h, Li / Ld) and wedge / narrow belt tables",
   "url": "https://santent.in/wp-content/uploads/2020/08/Optibelt-Belt-Range.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ZZR Parts",
   "title": "Classic V-series (DIN 2215 / ISO 4184): top width bo, datum width bd, height h",
   "url": "https://www.zzr-parts.com/?p=944",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Gates (Statewide Bearings copy)",
   "title": "Industrial V-belt catalogue: section widths and heights, datum and outside lengths",
   "url": "https://www.statewidebearings.com.au/wp-content/uploads/2018/06/Gates-Industrial-V-Belts-1.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "VBeltSupply",
   "title": "Belt spec guide: inch top width x height for classical, 3V / 5V / 8V, SPZ to SPC; length designation examples",
   "url": "https://www.vbeltsupply.com/media/wysiwyg/guides/belt-spec-guide.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Tameson",
   "title": "V-belt size chart: top width and height of Z, A, B, C, D, E, 3V, 5V, 8V, SPZ, SPA, SPB, SPC",
   "url": "https://tameson.com/v-belt-size-chart.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Dayco",
   "title": "Industrial product guide: V-belt Li and Ld examples per section, A 13 x 8, 3V 9.5 x 8, SPA 13 x 10",
   "url": "https://na.daycoaftermarket.com/wp-content/uploads/IND-DR-VB-PG-0619-Industrial-Product-Guide.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "acorn-ind.co.uk (ContiTech listing)",
   "title": "Wrapped classical V-belt rows with Li and Ld in mm (A, B)",
   "url": "https://www.acorn-ind.co.uk/contitech/power-transmission/industrial-belts/v-belts/wrapped-classical-v-belts/?start=240",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "acorn-ind.co.uk (ContiTech listing)",
   "title": "Wrapped classical V-belt rows with Li (in) and Ld (mm)",
   "url": "https://www.acorn-ind.co.uk/power-transmission/industrial-belts/v-belts/wrapped-classical-v-belts/?start=600",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Aims Industrial",
   "title": "How to measure a V-belt: Li, La, Ld definitions; narrow-section inside-to-pitch length additions",
   "url": "https://aimsindustrial.com.au/blogs/product-guides/blog-how-to-measure-a-v-belt",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ISO",
   "title": "ISO 4184:2025 Belt drives, classical and narrow V-belts, lengths in datum system (standard; sold, not reproduced)",
   "url": "https://www.iso.org/standard/88704.html",
   "formats": [
    "standard"
   ],
   "license": "ISO; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "V-belts (classical, narrow, banded) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/c81-v-belts",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "v-belts-narrow-3v-5v-8v-spz-spa-spb-spc",
  "v-belt-pulley-grooves-iso-4183-narrow",
  "timing-belt-profiles-pitch-and-tooth",
  "taper-lock-bushings-1008-to-5050",
  "qd-bushings-sh-sds-sd",
  "parallel-keys-din-6885"
 ],
 "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": [
  {
   "feature": "datum width bd",
   "exact": "Z 8.5, A 11, B 14, C 19, D 27, E 32 mm",
   "mates": "pulley groove datum width wd (ISO 4183): see v-belt-pulley-grooves-iso-4183-narrow",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "How wide is an A-section V-belt?",
   "a": "13 mm (1/2 in) top width and 8 mm (5/16 in) high; datum width 11 mm."
  },
  {
   "q": "How wide is a B-section V-belt?",
   "a": "17 mm (21/32 in) top width, 11 mm high (7/16 in; Tameson prints 13/32 in); datum width 14 mm."
  },
  {
   "q": "What is the difference between inside length and pitch length?",
   "a": "Inside length Li is measured round the inner face; pitch (datum) length Ld at the belt's pitch line. Ld = Li + a section-dependent add-on: ContiTech prints +30 mm for A and +45 mm for B, Dayco +33 and +40."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/v-belts-classical-z-a-b-c-d-e/index.md"
}