Plastic Spur Gear Precision grade : JIS Grade N9 (JIS B 1702-1:1998) JIS Grade 5 (JIS B 1702:1976) Core hardness HRR115120 Gear teeth Standard full depth Surface hardness - Pressure angle 20 Surface treatment - Material MC901 Nylon Surface finish Hobbed Heat treatment - Datum reference surface for gear cutting Bore
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