Browning 1VL25X5/8 VL Series Variable Pitch Sheave 1 Groove 2.5" OD 5/8" Finished Bore Cast Iron

The Browning 1VL25X5/8 is a VL Series variable pitch sheave designed for fractional horsepower (FHP) belt drive applications. Constructed from durable cast iron, this single-groove sheave features a 5/8-inch finished bore and a 2.5-inch outside diameter, offering an adjustable pitch diameter range of 1.6 to 2.4 inches to allow precise speed tuning without changing belts or pulleys.

Variable pitch sheaves work by allowing the two angular-faced disc halves that form the V-groove to be moved relative to each other. Moving the discs closer together raises the belt in the groove, increasing the effective pitch diameter and driven speed. Moving them apart lowers the belt, reducing the pitch diameter and driven speed. This adjustment is expressed in number of turns open from the closed position, making fine-tuning straightforward in the field.

Key Features:

• Series: VL Series Variable Pitch
• Outside Diameter: 2.5 in (2-1/2 in)
• Bore Size: 5/8 in (0.625 in) finished bore with keyway
• Number of Grooves: 1
• Belt Compatibility: 3L cross-section FHP V-belt (Gripbelt® compatible)
• Pitch Diameter Range: 1.6 in (min) to 2.4 in (max)
• Face Width Range: 17/32 in (min) to 25/32 in (max)
• Overall Length: 1-11/16 in
• Material: Cast iron with external rib design for enhanced cooling
• Mounting: Finished bore, no bushing required
• Adjustment Method: Manual turn (turns open from closed position)
• Manufacturer Part Number: 1VL25X5/8 | Also cataloged as: 1046325

The external rib design promotes heat dissipation for extended belt life, and the sheave is precision balanced to deliver smooth, vibration-free performance. Ideal for HVAC blower assemblies, small conveyors, fans, and other FHP drive applications requiring adjustable output speed.