Browning 1VM50X3/4 VM Series Variable Pitch Sheave 1 Groove 4-3/4" OD 3/4" Finished Bore Cast Iron

The Browning 1VM50X3/4 is a VM Series single-groove variable pitch sheave designed for fractional horsepower V-belt drive applications. Constructed from durable cast iron with a 3/4 in. finished bore with keyway, this sheave provides reliable, adjustable speed control in belt-driven systems without requiring a full drive replacement.

Variable pitch sheaves work by using threaded, angular-faced discs that form the V-groove in which the belt rides. Moving the discs closer together causes the belt to ride higher in the groove, increasing the effective pitch diameter and raising driven speed. Moving them apart lowers the belt in the groove, reducing pitch diameter and decreasing speed. This speed adjustment is measured in number of turns open from closed position.

Key Specifications:

• Series: VM Series
• Outside Diameter: 4-3/4 in. (4.75 in.)
• Bore: 3/4 in. Finished Bore with Keyway
• Number of Grooves: 1
• Overall Length: 1-15/16 in.
• Face Width: 11/16 to 1-1/16 in.
• Compatible Belt Sections: 3L, 4L, A, 5L, B
• Pitch Diameter Range: 3.3–4.1 in. (3L) / 3.6–4.6 in. (4L/A) / 3.8–4.8 in. (5L/B)
• Material: Cast Iron

Key Features:

• External rib design provides cooling for longer belt life
• Precision balanced for smooth, vibration-free performance
• Compatible with Browning Gripbelt® 3L, 4L/A, and 5L/B cross-section FHP V-belts
• Any standard Browning sheave can be used as a companion sheave

The Browning 1VM50X3/4 is well-suited for fans, blowers, HVAC systems, pumps, conveyors, and other light-duty industrial power transmission applications requiring on-the-fly speed adjustment. Browning part number / UPC cross-reference: 1046481.