A spur gear is a cylindrical gear with straight teeth cut parallel to its axis, making it one of the most common and cost-effective ways to transmit rotational power between parallel shafts. 3BG Supply stocks spur gears in steel, metric, and plastic options, and can source custom spur gears to match your pitch, pressure angle, and bore requirements. Pair spur gears with our gear racks for rack and pinion applications, or contact our team for help specifying the right gear.
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FAQs
What is a spur gear?
A spur gear is a cylindrical gear with straight teeth cut parallel to the shaft axis, used to transmit rotational motion and torque between parallel shafts. It is one of the simplest and most widely used gear types in industrial power transmission.
What's the difference between a spur gear and a helical gear?
A spur gear has straight teeth that engage all at once, which is simple and efficient but can be noisier at higher speeds, while a helical gear has angled teeth that engage gradually for quieter, smoother operation. Helical gears also generate axial thrust loads that spur gears do not.
What is the module of a spur gear and how do I calculate it?
Module is a metric measurement describing tooth size, calculated by dividing the pitch diameter by the number of teeth on the gear. A larger module indicates larger, stronger teeth capable of handling higher loads, and mating gears must share the same module to mesh correctly.
What is the pressure angle of a spur gear?
Pressure angle is the angle between the line of action (where mating teeth contact) and a line tangent to the pitch circle, most commonly 14.5 or 20 degrees in industrial spur gears. Mating gears must share the same pressure angle to mesh properly and distribute load correctly.
Does 3BG Supply offer custom or metric spur gears?
Yes, 3BG Supply stocks metric spur gears alongside standard inch-pitch options, and can source custom spur gears built to your specific tooth count, module, bore, and hub configuration. Send us your prints or an existing sample for a quote.
What materials are spur gears available in?
Spur gears are commonly available in steel for heavy industrial loads, and in engineered plastics for lighter-duty, quieter, or corrosion-sensitive applications. 3BG Supply stocks both steel and plastic spur gear options across a range of sizes.
Industrial Spur Gear Manufacturers
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