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1–86 Hubless Spur Gears - Module 2.5 Did You Know? … That Fairloc® is a specially designed hub fastening device that has many unique advantages over set screw or keyway methods?  See Section 6 for a full explanation. 25 mm FACE 20° PRESSURE ANGLE ISO CLASS 8 D P.D. Catalog Number No. of Teeth S12N25M032S2515 S12N25M035S2515 S12N25M036S2515 S12N25M040S2520 S12N25M042S2520 S12N25M045S2520 S12N25M048S2520 S12N25M050S2520 S12N25M055S2520 S12N25M056S2520 S12N25M060S2520 S12N25M064S2520 32 35 36 40 42 45 48 50 55 56 60 64   80   87.5   90 100 105 112.5 120 125 137.5 140 150 160   85   92.5   95 105 110 117.5 125 130 142.5 145 155 165 Available as special order:  Number of teeth not listed, different bore size and/or material, passivation. MATERIAL:  303 Stainless Steel d* Bore H7 15 20 *Bore Tolerance:  15 mm  +0.018 20 mm  +0.021 P.D. D 25 d