RS PRO Steel 20 Teeth Spur Gear, 0.5 Module, 4mm Bore, 10 mm Pitch Diameter, 9 mm Hub Diameter 878-7821

RS PRO 878-7821 is a steel spur gear engineered for industrial mechanical power transmission systems. This 20 teeth spur gear has a module of 0.5, a 4 mm bore diameter, a 10 mm pitch diameter, and a 9 mm hub diameter, making it suitable for precision applications requiring accurate torque multiplication and speed reduction.

Constructed from Steel EN8 (080M40/080M46) or an equivalent grade, it combines strength with reliability. The gear features a standard 20° pressure angle and conforms to DIN 867, DIN 3962, and DIN 3963 quality standards, ensuring consistency and interchangeability within industrial and laboratory equipment.

Its dimensions and standard tolerance of ±0.25 mm make it compatible with various mechanical assemblies including machine tools and transmission systems. The bore diameter of 4 mm allows for secure shaft fitting and the 9 mm hub diameter provides adequate support for torque transfer.

These spur gears are essential components for applications involving speed reduction and power transmission, commonly used in industrial manufacturing, mechanical machinery maintenance, and fluid power equipment setups.

Constructed from high-quality steel for durability and performance. 20° pressure angle compatible with industry-standard spur gears. Manufactured according to DIN 867, DIN 3962, and DIN 3963 standards for quality assurance.

Bore diameter precisely 4 mm for secure mounting. 9 mm hub diameter supports efficient torque transmission. Face width of 4 mm complements pitch diameter of 10 mm for balanced performance. Utilized in machine tools, transmissions, and speed reduction mechanisms.

Originating from China and representing new product condition, the RS PRO 878-7821 spur gear is a dependable choice for engineering tasks requiring precise gear ratios and mechanical reliability. Browse our Mechanical Gears catalog for related power transmission components and further solutions.