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Unbored Solid Hub V-Belt Pulleys

Unbored Solid Hub SPZ, SPA, SPB, SPC V-belt pulleys are the basic type of V-belt pulleys. They are produced in standard series and dimensions. They are made of gray cast iron.

The V-belt pulley design is based on DIN 2211 and ISO 4183 standards.

The pulleys are supplied as semi-finished products and the bore must be modified before mounting the pulleys on the shafts.

SPZ Standard

For belts SPZ, XPZ, 3V, 3VX, Z/10, ZX/10
Groove widht b (mm): 10.0
Diameter Dm (mm): 45 - 400

SPA Standard

For belts SPA, XPA, A, AX, 13
Groove widht b (mm): 13.0
Diameter Dm (mm): 40 - 630

SPB Standard

For belts SPB, XPB, 5V, 5VX, B, BX, 17
Groove widht b (mm): 17.0
Diameter Dm (mm): 56 - 630

SPC Standard

For belts SPC, XPC, C, CX, 22
Groove widht b (mm): 22.0
Diameter Dm (mm): 100 - 630

Pulleys Fields of Use

The solid hub V-belt pulleys meet the highest requirements of modern drive technology and are used in all areas of mechanical engineering, from fine mechanics to heavy engineering.

They are typically used in compressors, blowers, machine tools, in the paper and chemical industry and in many other machines.

Pulleys Material

Fine grain cast-iron grade 220-260.

Other materials to order.

Parameter Standard
Eccentricity of O/D to bore DIN 2211 Part. 1
Groove side wobble tolerance DIN 2211 Part. 1
Surface roughness ISO 254
Balance quality grade VDI 2060, ISO 1940

Pulleys with Dw > 125 mm are statically balanced, degree q 6.3 at 1500 rpm. On request, the pulleys can be balanced dynamically in two planes, degree q 6.3 - q 2.5.

Pulleys Basic Profile

  • Pulley SPZ for belts SPZ, XPZ, 3V, 3VX, Z, ZX, 10
  • Pulley SPA for belts SPA, XPA, A, AX, 13
  • Pulley SPB for belts SPB, XPB, 5V, 5VX, B, BX, 17
  • Pulley SPC for belts SPC, XPC, C, CX, 22

Pulleys Code Description

SPB 180-2 Unbored

Code Part Description



Nominal diameter of pulley in mm


Number of grooves


Unbored without a hole

Pulleys Profile and Dimensions

Single and Multiple Wedge Groove Dimensions

Profile Dm
SPZ (≤80) >80 (38) 34 9.7 8.5 12.0 8 2.0 11.0
SPA (≤118) >118 (38) 34 12.7 11.0 15.0 10 2.8 13.8
SPB (≤190) >190 (38) 34 16.3 14.0 19.0 12 3.5 17.5
SPC (≤315) >315 (38) 34 22.0 19.0 25.5 17 4.8 23.8

Crown width \(B\): \[B = {E^{(n-1)} + 2 \cdot F}\ {[mm]}\] where \(n\) is the number of grooves.

Other technical data for particular groove dimensions are to be found in the technical documentation.

Documents for Download

Dimensions and Parameters of Unbored Solid Hub V-Belt Pulleys - Preview

Dimensions and Parameters of Unbored Solid Hub V-Belt Pulleys

TYMA CZ Data Sheets

Czech and English (PDF 1.57 MB)

Pulleys and Clamping Bushes - Preview

Pulleys and Clamping Bushes

TYMA CZ Catalogue

Czech and English (PDF 3.64 MB)