Stock Drive Products & Sterling Instrument - SDP/SI 80 DP, 54 Teeth, 20° Pressure Angle, Anti-Backlash Spur Gear S1M56A-F080A054

The Fairloc® Hub Mini-Lash Gear is an 80 pitch, 20° pressure angle spur gear designed for anti-backlash applications, with a 0.104-inch face width. It is available in 303 stainless steel or 2024-T4/T351 aluminum alloy, anodized before cutting, with a 303 stainless steel hub and 302 stainless steel torsion spring. The part number S1M56A-F080A054 corresponds to a 54-tooth gear with a bore of 0.1873 inches (3/16 inch), an outside diameter of 0.713 inches, and a pitch diameter of 0.6875 inches. The gear requires a controlled shaft fit of 0.0001 to 0.0008 inch clearance. The assembly is designed for precision applications where backlash control is critical, and specifies a maximum radius of 0.31 inch for the hub. The part conforms to AGMA 10 standards for gear accuracy. The nominal bore codes for the 80 pitch series are consistent across variants, with the listed bore size and tooth count defining the specific model.