These fine pitch, stainless steel spur gears have an integral hub locking mechanism which enables the gear to be fastened to the shaft without any keys or set screws.
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Stainless Steel F-Loc Hub Spur Gears SUSF

KHK SUSF0.5-16, Module 0.5, 16 Tooth, F-Loc Hub Stainless Steel Gears
Stainless Steel F-Loc Hub Spur Gears SUSF

KHK SUSF0.5-18, Module 0.5, 18 Tooth, F-Loc Hub Stainless Steel Gears
Stainless Steel F-Loc Hub Spur Gears SUSF

KHK SUSF0.5-20, Module 0.5, 20 Tooth, F-Loc Hub Stainless Steel Gears
Stainless Steel F-Loc Hub Spur Gears SUSF

KHK SUSF0.5-24, Module 0.5, 24 Tooth, F-Loc Hub Stainless Steel Gears
Stainless Steel F-Loc Hub Spur Gears SUSF

KHK SUSF0.5-25, Module 0.5, 25 Tooth, F-Loc Hub Stainless Steel Gears
Gear Type N/A Spur Gears
Construction N/A F-Loc Hub Stainless Steel Gears
Bore Type N/A F-Loc
Module N/A 0.5
No. of Teeth N/A 16 N/A 18 N/A 20 N/A 24 N/A 25
Shape N/A S3
Bore Diameter (A) N/A 0.157 in4 mm N/A 0.157 in4 mm N/A 0.157 in4 mm N/A 0.197 in5 mm N/A 0.197 in5 mm
Hub Diameter (B) N/A 0.551 in14 mm
Pitch Diameter (C) N/A 0.315 in8 mm N/A 0.354 in9 mm N/A 0.394 in10 mm N/A 0.472 in12 mm N/A 0.492 in12.5 mm
Outer Diameter (D) N/A 0.354 in9 mm N/A 0.394 in10 mm N/A 0.433 in11 mm N/A 0.512 in13 mm N/A 0.531 in13.5 mm
Face Width (E) N/A 0.276 in7 mm
Hub Width (F) N/A 0.315 in8 mm
Total Length (G) N/A 0.866 in22 mm
Cap Screw Size N/A M2.5
Cap Screw Offset from Hub (J) N/A 0.130 in3.3 mm
Cap Screw Offset from Center (K) N/A 0.173 in4.4 mm
Bending Strength N/A 0.4 N·m0.04 kgf·m N/A 0.47 N·m0.048 kgf·m N/A 0.56 N·m0.057 kgf·m N/A 0.72 N·m0.074 kgf·m N/A 0.76 N·m0.078 kgf·m
Surface Durability N/A 0.023 N·m0.0023 kgf·m N/A 0.03 N·m0.0031 kgf·m N/A 0.038 N·m0.0039 kgf·m N/A 0.056 N·m0.0057 kgf·m N/A 0.061 N·m0.0062 kgf·m
Reference Slipping Torque N/A 0.62/0.36 N·m
Backlash N/A 0-0.0039 in0-0.10 mm
Precision Grade N/A JIS grade N8 (JIS B 1702-1: 1998)
Gear Teeth Type N/A Standard Full Depth
Pressure Angle N/A 20 º
Material N/A SUS303
Tooth Hardness N/A less than 187HB
Weight N/A 0.0137 kg0.030 lb N/A 0.0152 kg0.034 lb N/A 0.0169 kg0.037 lb N/A 0.0197 kg0.043 lb N/A 0.0208 kg0.046 lb