The BK70-3/4 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: BK70-3/4 - Product Type: V-Belt Sheave - Material: Cast Iron - Belt Section Size: 4L, A, 5L, B - Pitch Diameter for 3L Belts: 6 in - Pitch Diameter for 4L or A Belts: 6.4 in - Pitch Diameter for 5L or B Belts: 6.4 in - Number of Grooves: 1 - Bore Diameter: 0.75 in - Bore Type: Finished Bore with Keyway and 2 Set Screws - Outer Diameter: 6.75 in - Overall Width: 1.46875 in - Overall Length: 6.75 in - Overall Height: 6.75 in - Length Through Bore: 1.4685 in - Hub Diameter: 1.575 in - Hub Length: 0.6575 in - Face Width: 0.874 in - Side Face Offset: 0.063 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: 4.02 lb Stocked and shipped fast from offroadbelts.com. Industrial-grade replacement part for OEM, MRO and maintenance buyers — order with confidence.