The 25B21H X 1/4 MPB is a roller chain sprocket for roller chain power transmission in industrial, conveyor and agricultural drives. Built for accurate chain engagement, even load distribution and long service life under continuous duty. Specifications: - Manufacturer Part Number: 25B21H X 1/4 MPB - Product Type: Roller Chain Sprocket - Material: Steel - Pitch: 6.35 mm - Pitch Diameter: 42.6212 mm - Chain Size (Number): 25 - Number of Strands: 1 - Number of Teeth: 21 - Bore Diameter: 6.35 mm - Bore Type: Stock Plain Bore - Outer Diameter: 45.9486 mm - Overall Width: 15.875 mm - Overall Length: 1.809 in - Overall Height: 1.809 in - Tooth Width: 2.794 mm - Roller Diameter: 3.302 mm - Finish/Coating: Black Oxide - Part Weight: 0.27 lb Stocked and shipped fast from offroadbelts.com. Industrial-grade replacement part for OEM, MRO and maintenance buyers — order with confidence.