Spur gears with hub are straight-tooth cylindrical gears with a 20° pressure angle and a single-sided extended hub. This is the most frequently chosen version of module gears: you can mount them directly on a motor or gearbox shaft or use them as the driving pinion for a gear rack.

Spur gears with hub - stable seating on the shaft

The hub lengthens the fit on the shaft, so the gear sits stably without runout, and the hub has room for a keyway and set screw. You bore out the pilot bore to the exact shaft diameter, so one gear fits many designs. You can choose gears in C45E steel, with induction-hardened teeth (45-55 HRC) for high loads, in selected modules in stainless steel for damp conditions and the food industry, and in PA6+FV polyamide - light and quiet-running.

Spur gears with hub to DIN 867 - divided by module

Gears with hub with an involute profile to DIN 867, divided into subgroups by module. The gear length and face width increase with the module, and exact hub and bore dimensions are given on the product page. O3D gears 3D printed from PA12 polyamide reinforced with chopped carbon fibre (PA12-CF15) are also available in intermediate modules that are rarely found in steel. Gears without a hub can be found in the Plate spur gears group.

Questions and answers: module spur gears with hub

What does hub height A mean in the technical data?

It is the total length of the gear along the axis, i.e. the face width of the gear rim together with the hub.

Can a hardened gear with hub be bored out?

Yes. Only the teeth are induction-hardened, and the bore area remains soft, so it is machined the same way as in an unhardened gear.

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Spur gears with hub