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Parallel-shaft spur gearsSpur gears are geometrically straightforward, but bore location, center distance, material response and the mating gear still control working mesh quality.Spur gears are often the simplest plastic gear geometry to source, which makes it tempting to under-specify them. Tooth count and outside diameter are not enough to reproduce an existing mesh; pitch system, pressure angle and center distance also matter.What to define before opening an RFQTooth count and module/DPPressure angle and face widthCenter distance and mating gearBore, hub, key or press fitBacklash, noise and wear requirementsIf noise or life is the reason for changing from metal to plastic, include the mating gear material and the expected lubricant condition. Those details affect the wear pair and the backlash needed over the service range.How to use this categoryThe product cards below are linked to the live WooCommerce catalogue for Plastic Spur Gears. Open the closest geometry first, then compare its RFQ guidance against your drawing. If no listed product matches the interface, use the custom component route rather than forcing the part into the wrong family.