v belt pulley 1.Material: high quality cast iron 2.ISO/British standard pulleys: SPZ/SPA/SPB/SPC 3.MPTA standard pulleys: 3/5/8V 4.Available in various sizes (inch) MPTA Standard PulleygbtefPa°3V0.350.0250.350.4070.3443.534°±0.5°3.5638°±0.5°6.011240°±0.5°1242°±0.5°5V0.60.050.60.6880.510.138°±0.5°10.11640°±0.5°1642°±0.5°8V10.111.1250.751638°±0.5°1622.440°±0.5°22.442°±0.5° (mm)ISO Standard PulleygwpbtefPa°SPZ9.7+0.18.5211+0.6-012±0.28±0.38034°±0.5°-08038°±0.5°SPA12.7+0.1112.7513.8+0.6-015±0.210±0.311834°±0.5°-011838°±0.5°SPB16.3+0.1143.517.5+0.6-019±0.212.5±0.319034°±0.5°-019038°±0.5°SPC22+0.1194.823.8+0.6-025.5±0.217±0.331534°±0.5°-031538°±0.5°