V-Idler Pulley, 4-1/2"ODX3/8" Bore

V-Idler Pulley, 4-1/2"OD X 3/8" Bore

The 280-321 V-Idler Pulley is a steel idler pulley designed to maintain proper belt tracking and tension in V-belt drive systems. With a 4-1/2" outside diameter and 3/8" bore, it provides reliable support in compact applications where smooth belt guidance matters—and where a wandering belt is not part of the plan.

Country of Origin
Varies by production batch

Key Features / Specifications

• Model / Part Number: 280-321
• Product Type: V-idler pulley
• Outside Diameter (A): 4-1/2 in
• Bore (C): 3/8 in
• Overall Width (B): 3 in
• Hub Diameter (D): 3/4 in
• Material: Steel
• Thickness (T): 0.075 in
• Mounting Hole / Feature (E): 7/32 in
• Additional Dimension (H): 7/32 in
• Dim F: N/A

Ideal For

• V-belt systems needing an idler pulley for belt guidance or tensioning
• Equipment with a 3/8" shaft and compact pulley clearance
• Repairs or replacements where steel construction is preferred for durability
• Keeping belts running straight, quiet, and where they belong—on the pulley, not the guard