3BK34-7/8 PD 3.55" OD 3-Groove Cast Iron Sheave 7/8" Bore A/B Belts

3BK34-7/8PD 3.55" OD 7/8" Finished Bore 3-Groove Cast Iron Sheave (A/B V-Belt Pulley)

The 3BK34-7/8PD is a heavy-duty 3-groove cast iron sheave engineered for reliable power transmission in commercial and industrial HVAC and machinery applications.

Key Specifications

• Part / Model Number: 3BK34-7/8PD (3BK34-7/8)
• Number of Grooves: 3
• Outer Diameter (OD): 3.55 Inches
• Bore Size: 7/8 Inch Finished Bore
• Bore Type: Fixed Bore w/ Standard Keyway & Setscrews
• Belt Section Compatibility: A, B, 4L, and 5L V-Belts
• Material: Class 30 Heavy-Duty Cast Iron
• Finish: Protective Gray Powder / Rust-Resistant Coating

Product Features & Fitment

Manufactured from high-tensile Class 30 cast iron, the 3BK34-7/8PD is built to resist wear, heat, and distortion under continuous heavy loads. Equipped with a precision 7/8-inch factory-bored hub, integrated keyway, and dual threaded setscrews, this sheave provides a secure, slip-free lock on drive shafts. It is an ideal replacement pulley for commercial air handlers, HVAC blower drives, industrial compressors, electric motors, and agricultural machinery.