0.5M 38T Spur Gears Steel Pinion Gears Metal Spur Transmission Gear 45 Steel

Measure your motor or drive shaft diameter with calipers. Select the bore that matches: 6 mm for small hobby motors, 8 mm for mid-range DC or stepper motors, and 10 mm for larger shafts. The bore should be a snug fit — use a set screw or keyway to secure the gear on the shaft.

Yes. Any two gears with the same module (0.5M) and pressure angle (20°) will mesh correctly regardless of tooth count. These 38T gears will pair with any other 0.5M spur, rack, or pinion gear in your system.

45# carbon steel has significantly higher tensile strength and hardness than common engineering plastics such as POM or nylon. For applications with moderate-to-high torque, repeated load cycles, or elevated temperatures, steel gears provide far greater durability and dimensional stability.

45# carbon steel is not inherently stainless. For indoor or dry environments, the natural steel finish is adequate. For humid or outdoor applications, apply a light machine oil or anti-rust coating after installation to extend service life.

Gear ratio depends on the tooth count of the mating pinion. For example, pairing a 38T gear with a 19T pinion gives a 2:1 reduction ratio. Pair with different tooth counts to achieve your target speed or torque multiplication.

Yes. 0.5M spur gears are commonly used in compact extruder drives, axis transmission systems, and small CNC routing heads. Verify that your existing gear train uses 0.5 module and that the bore matches your motor shaft before ordering.

Multi-packs (3, 5, 10, 20, 30, or 50 pcs) reduce per-unit cost and ensure you have spares on hand for repairs or batch builds. For production runs or classroom robotics kits, bulk packs offer the best value per gear.