Reely Polyacetal Spur Gear Module 0.5, 40 Teeth, 4 mm Bore (SH0540HF)

Precision 40-tooth spur gear in low-friction polyacetal (POM) with a 0.5 module and 4 mm bore, delivering smooth, quiet power transfer for model building and robotics.

Overview

The Reely SH0540HF is an injection-molded spur gear made from polyacetal (POM), a self-lubricating engineering plastic known for high wear resistance and low friction. With a module of 0.5 and 40 teeth, it provides a pitch diameter of 20 mm and an outside diameter of 21 mm. The 4 mm bore fits standard shafts, and the involute tooth profile with a 20° pressure angle ensures efficient meshing with compatible gears.

What stands out

• Self-lubricating POM material reduces maintenance and extends service life.
• High wear resistance and low friction for reliable, low-noise operation.
• Precision injection molding ensures consistent tooth geometry.
• Operates across a wide temperature range from -40°C to +100°C.
• Good chemical resistance against many solvents and chemicals.

Technical details

• Gear type: Spur gear
• Material: Polyacetal (POM)
• Module: 0.5
• Number of teeth: 40
• Bore diameter: 4 mm
• Pitch diameter: 20 mm
• Outside diameter: 21 mm
• Pressure angle: 20°
• Tooth profile: Involute
• Shaft compatibility: 4 mm diameter shafts
• Manufacturing method: Injection molded
• Operating temperature range: -40°C to +100°C
• Chemical resistance: Good against many solvents and chemicals
• Applications: Model building, robotics, precision mechanics, RC applications

Our verdict

A dependable, precision-molded gear for demanding small-scale drivetrains where smooth, quiet operation and longevity matter.