The SPB180-3-2517 pulley is a fundamental transmission component designed for medium-to-heavy loads and high-impact operating conditions. Compared with the SPA series, the SPB groove profile has a wid...
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The Mn5 β20° Z20 large-module helical gear is designed for low-speed, high-torque, high-shock heavy industrial equipment. The thick tooth root of module 5 combined with a large 20° helix angle keeps it far smoother than a spur gear even when transmitting huge torque, making it a core transmission part of heavy-duty reducers and mining machinery.
| Item | Specification |
| Normal module | 5 |
| Number of teeth | 20 |
| Helix angle | 20° |
| Normal pressure angle | 20° |
| Material | 45# steel, quenched and tempered |
| Pitch circle diameter | approx. 106.42mm |
| Tip circle diameter | approx. 116.42mm |
| Transmission ratio | 1:1~5:1 |
| Pitch line velocity | ≤15m/s |
| Machining | Gear hobbing; custom bore and keyway available on request |
Shanghai Rentai Transmission Equipment Co., Ltd. is a manufacturer specializing in R&D, production and export of mechanical transmission components. Our main products include taper lock pulleys, taper lock bushes, timing pulleys, V-belts and timing belts. We also provide OEM & ODM custom service for non-standard transmission parts. Our factory covers over 8000 square meters, with more than 100 employees including 22 technical staff. We integrate casting, machining and finishing, equipped with CNC machines and testing instruments, with an annual casting output of 2000 tons. Supported by complete quality management system and international standards, our products are exported to Southeast Asia, Middle East, Europe and America, delivering reliable transmission solutions for global industrial clients.

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