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Home / Product Range / Industrial Gears / 45# Steel Helical Gears / Mn5 20° Z20 Large-Module Heavy-Duty Helical Gear, for Crushers and Heavy Construction Machinery
  • Mn5 20° Z20 Large-Module Heavy-Duty Helical Gear, for Crushers and Heavy Construction Machinery
  • Mn5 20° Z20 Large-Module Heavy-Duty Helical Gear, for Crushers and Heavy Construction Machinery
45# Steel Helical Gears

Mn5 20° Z20 Large-Module Heavy-Duty Helical Gear, for Crushers and Heavy Construction Machinery

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
Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. Large module, thick tooth root, unafraid of heavy-load shock: The M5 module gives the gear an extremely thick tooth-root cross-section and very high bending fatigue strength. In equipment with severe vibration such as crushers and rolling mills, it effectively prevents tooth breakage and runs very reliably.
2. Large 20° helix angle, very high contact ratio: Compared with the conventional 15° helix angle, this gear uses a 20° design, which greatly increases both transverse and overlap contact ratios in operation. Meshing is more continuous and gentle, contact stress per unit area is lower, and load capacity rises further.
3. Quenched and tempered 45# steel, balancing strength, toughness, and cost: Made of quality 45# carbon structural steel with overall quenching and tempering. The core has excellent impact toughness while the surface machines well, making it an ideal choice for cost-effective heavy-load transmission.
4. Suited to low-speed, high-torque conditions: Optimized for low-to-medium pitch line velocities of ≤15m/s, it is suitable for heavy machinery that does not demand ultimate quietness but demands "absolute power" and ruggedness.

A "power-type" gear for heavy transmission: Built for high-load, low-speed harsh conditions, achieving the strongest shock resistance with the most economical material.
Smoothness benefits from the large helix angle: Significantly reduces jerking when large heavy-load equipment starts, protecting the motor and main shaft.
Flexible customization service: Metric/imperial bores, double keyways, and hub dimensions can be made to drawing.

Mining and metallurgy: Jaw crusher gearboxes, ball mill drives, and main reducers of metallurgical rolling mills.
Heavy construction machinery: Slewing mechanisms of large cranes, final drives of crawler bulldozers, and winches.
Material handling and building materials: Heavy-duty scraper conveyors, cement rotary kilns, and large bucket elevators.
Rubber and plastics machinery: Gearboxes of large internal mixers and heavy-duty extruders.

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About Rentai
Transmission Equipment

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.

  • 10+

    Industry Experience

  • 100+

    Production staff

  • 2000+Ton

    Annual Production

  • 8000+㎡

    Factory Area

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