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If you only run plastic spur gears these pinions are the perfect choice.
32 pitch alloy pinions are not heat treated and should only be used with plastic spur gears.
The 48 Pitch Hard Nickel Plated Alloy Steel Pinions are precision cut gears that last and last when used with a plastic spur gear. Pinions are stamped with tooth number.
RRP1223 - Extra Hard Steel 5mm Bore 1 Module Pinion, 23T