# V-belt pulley grooves ISO 4183: SPZ, SPA, SPB, SPC datum width, groove spacing, angle and minimum diameter

> What are the groove dimensions of an SPZ, SPA, SPB or SPC V-belt pulley (ISO 4183): datum width, groove spacing, groove angle and minimum datum diameter?

- Category: Hardware › Bearings, rails & motion
- Kind: Standard part
- Basis: ISO 4183:1995 sample pages (datum widths, spacing, angles, minimum diameters) and the Miskolc pulley table; disagreements shown; partial by design
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**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- ISO 4183 defines pulley grooves for classical (Y, Z, A, B, C, D, E) and narrow (SPZ, SPA, SPB, SPC) V-belts by the datum width wd, the groove width at the datum line where the belt's effective (pitch) line sits. Datum widths: Y 5.3, Z 8.5, A 11, B 14, C 19, D 27, E 32 mm; the narrow profiles SPZ / SPA / SPB / SPC use 8.5 / 11 / 14 / 19. Allowed groove angles are 32°, 34°, 36°, 38° (± 0.5°); the narrow profiles use 34° on small and 38° on large datum diameters.
- Where the two sources agree: datum widths; groove spacing e = 12, 15, 19, 25.5 mm for SPZ / SPA / SPB / SPC (the ISO 4183 sample shows 12 / 15 / 19 / 25,5 and the Miskolc table 12 / 15 / 19 / 255, a misprint of 25.5 that is read as 25.5 here); angle breaks 80 / 118 / 190 / 315 mm (Miskolc lists them directly: 34° for P up to the value, 38° above; the ISO sample shows the 118 / 190 / 315 breaks); the minimum datum diameters 63 / 90 / 140 / 224 mm (ISO sample table; the profile order was read from the sequence).
- Where they differ or are single-source: the depth above the datum line b (Miskolc 2.0 / 2.8 / 3.5 / 4.8 against an ISO-sample reading of 2 / 2.75 / 3.15 / 4.8; shown in brackets where it differs); groove depth below the datum h (Miskolc only: 11 / 13.8 / 17.5 / 23.8 mm; the ISO sample shows 8.7 / 10.8 / 14.3 for the classical A / B / C, which share rows with SPA / SPB / SPC, so h must be taken from the standard or the maker before cutting). Edge distance f (Miskolc 8 / 10 / 12.5 / 17 mm; the ISO sample prints minimums of 7 / 9, 9 / 11, 11.5 and 16 for Z / SPZ, A / SPA, B / SPB and C / SPC), tolerances on e (± 0.3 / 0.4 / 0.5 mm) and the groove-surface finish were not tabulated.
- Left out: the RMA / MPTA IP-20 classical A / B and 3V / 5V (and 8V) sheave groove tables (groove angle 34° / 36° / 38° by outside diameter, depth, spacing): none of the readable sources gave the numbers legibly, so they are not in the table and no groove-gauge profile was drawn from the inch tables. The ISO 4183 numbers above are not enough for a groove gauge either (depth h conflicts), so no files.
- Sheave CAD: the groove profiles are in the standard (paid) and in the pulley makers' catalogues; QD and Taper-Lock bores are on the bushing pages.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| groove datum width | wd 8.5 / 11 / 14 / 19 mm (SPZ / SPA / SPB / SPC), angle 34° or 38° | SPZ / SPA / SPB / SPC V-belt of the same section | designed | all |

## Sizes

| groove profile | datum width wd, mm | groove spacing e, mm | groove angle by datum Ø dd, mm | min datum Ø dd, mm | groove depth above datum b, mm | groove depth below datum h, mm |
|---|---|---|---|---|---|---|
| SPZ | 8.5 | 12 | 34° up to 80, 38° above | 63 | 2 | 11 (Miskolc) |
| SPA | 11 | 15 | 34° up to 118, 38° above | 90 | 2.8 (ISO sample 2.75) | 13.8 (Miskolc) |
| SPB | 14 | 19 | 34° up to 190, 38° above | 140 | 3.5 (ISO sample 3.15) | 17.5 (Miskolc) |
| SPC | 19 | 25.5 | 34° up to 315, 38° above | 224 | 4.8 | 23.8 (Miskolc) |

## Where the files are

- ISO (iTeh sample pages): [ISO 4183:1995 Belt drives, classical and narrow V-belts, grooved pulleys (system based on datum width): datum widths, groove spacing, angles, minimum datum diameters](https://cdn.standards.iteh.ai/samples/25817/ae47c2ed867549cbadc47a63b459cf35/ISO-4183-1995.pdf) — web — Publisher's page; dimensions are facts
- University of Miskolc (course material): [Wedge-belt pulley table SPZ / SPA / SPB / SPC: belt and groove dimensions, 34° / 38° pitch-diameter limits](https://web.uni-miskolc.hu/gepelemek/tantargyaink/004b_gepelemek2/oktatasi-segedanyag/1_rugalmas_hajtas_mellekletek4-ekszijtarcsak.pdf) — web — Publisher's page; dimensions are facts
- ISO: [ISO 4183 Belt drives: classical and narrow V-belts, grooved pulleys (the standard itself, paid)](https://standards.iteh.ai/catalog/standards/iso/a5169929-6125-4f88-a7fb-9dfd40907936/iso-4183-1995) — web — Publisher's page; dimensions are facts

## Questions

**What is the groove datum width of SPZ, SPA, SPB and SPC?**

8.5, 11, 14 and 19 mm.

**What groove angle does an SPA pulley use?**

34° up to a 118 mm datum diameter, 38° above (Miskolc table; the ISO 4183 sample shows the same break).

**What is the groove spacing for SPB?**

19 mm centre to centre (tolerance ± 0.4 mm), with 25.5 mm for SPC.

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