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Home / Product Range / Industrial Gears / 45# Steel Bevel Gears / 2M 25-Tooth 90° Black-Oxide Spiral Bevel Gear, for Small Gear Motors and Precision Direction Changing
  • 2M 25-Tooth 90° Black-Oxide Spiral Bevel Gear, for Small Gear Motors and Precision Direction Changing
  • 2M 25-Tooth 90° Black-Oxide Spiral Bevel Gear, for Small Gear Motors and Precision Direction Changing
45# Steel Bevel Gears

2M 25-Tooth 90° Black-Oxide Spiral Bevel Gear, for Small Gear Motors and Precision Direction Changing

The 2M 25-tooth spiral bevel gear is the core component for 90-degree direction-changing transmission in compact precision machinery. Compared with an ordinary straight bevel gear, it uses a spiral tooth design together with tooth-surface hardening, and performs with outstanding smoothness in small-size, low-noise, medium-load applications.

Item Specification
Module at large end 2M
Number of teeth 25
Shaft angle 90°
Tooth profile Spiral bevel gear (curved tooth)
Material 45# steel / 40Cr (optional)
Heat treatment Induction hardening of tooth surface
Surface treatment Black oxide for rust protection
Bore diameter 10mm (custom supported)
Tooth outside diameter 53mm
Tooth length 19mm
Overall height 31mm
Hub diameter 46mm
Hub height 20mm
Transmission ratio 1:1 (must be used in pairs with the same module and tooth count)
Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. Curved-tooth progressive meshing, quiet and smooth: The spiral teeth engage and disengage gradually in operation, with a contact ratio far higher than straight teeth. This design greatly suppresses gear whine during direction-changing transmission, giving low running noise and making it ideal for small-to-medium equipment with quietness requirements.
2. Hardened tooth surface + black oxide rust protection, wear-resistant and rugged: Made of quality 45# steel (or 40Cr) with induction-hardened teeth for high hardness and strong wear resistance. The black oxide finish further improves rust and corrosion protection for oily, humid workshop environments.
3. Compact, lightweight design: With a small 2M module, a tooth outside diameter of only 53mm, and a total height of 31mm (including the 20mm hub step), it is compact and occupies very little installation space, making it ideal for precision direction-change layouts inside automation equipment.
4. Shipped in matched pairs, smooth meshing: Spiral bevel gears must be used in pairs (1:1 constant-speed direction change). In production we strictly match them with the same module and tooth count, so customers receive gears that mesh perfectly and on-site commissioning is easier.

A "90-degree direction-change tool" for tiny spaces: An ultra-small outside diameter of about 50mm, built for micro reducers and precision machinery with limited space.
A cost-effective noise-reduction solution: Hardened 45# steel achieves wear resistance close to high-alloy steel at lower cost and faster delivery.
Ready to swap, low maintenance cost: Standardized bore (10mm) and hub dimensions make it a stock item for repair and replacement on older equipment.

Automation and light industrial machinery: Indexing mechanisms of small packaging machines and corner transmissions of light-load belt conveyor lines.
Power tools and transmissions: 90° direction changes in small gear motors, meat grinders, electric winches, and roller-shutter door motors.
Hardware and instruments: Auxiliary drives of printing presses, precision instrument gearboxes, and transmission sets of medical devices.
Agricultural machinery: Auxiliary steering and power distribution of small agricultural implements.

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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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