The BK25-7/8 is a v-belt sheave for v-belt power transmission drives in industrial, agricultural and HVAC equipment. Precision-machined for accurate belt tracking, smooth operation and long service life. Specifications: - Manufacturer Part Number: BK25-7/8 - Product Type: V-Belt Sheave - Material: Cast Iron - Belt Section Size: 4L, A, 5L, B - Pitch Diameter: 1.96 in - Pitch Diameter for 3L Belts: 1.9 in - Pitch Diameter for 4L or A Belts: 2.3 in - Pitch Diameter for 5L or B Belts: 2.3 in - Number of Grooves: 1 - Bore Diameter: 0.875 in - Bore Type: Finished Bore with Keyway and 2 Set Screws - Outer Diameter: 2.5 in - Overall Width: 1.625 in - Overall Length: 2.5 in - Overall Height: 2.5 in - Length Through Bore: 1.063 in - Hub Diameter: 1.575 in - Hub Length: 0.4094 in - Face Width: 0.811 in - Side Face Offset: 0.1575 in - Sheave Construction: Solid - Keyway Size: 3/16 X 3/32 - Set Screw Size: 5/16/2018 - Set Screw Quantity: 2 - Finish/Coating: Grey Paint - Recommended Tightening Torque (Lb-In): 110 in-lbs - Part Weight: 0.57 lb Stocked and shipped fast from offroadbelts.com. Industrial-grade replacement part for OEM, MRO and maintenance buyers — order with confidence.