Balmar Single V Pulley 2.7" (69mm) x 1/2" (13mm) Deep V with 17mm Bore

Precision-Engineered Single V-Groove Alternator Pulley for Optimal Belt Tracking

Maintaining consistent charging performance in demanding automotive, marine, and off-grid power systems requires reliable mechanical drive components. This Single V-Groove Pulley is precision-machined to provide dependable power transfer from the engine to your alternator or auxiliary driven equipment. Featuring a 2.7" (approx. 69mm) outer diameter and a 17mm centre bore, this pulley is designed to suit a wide variety of standard alternator shafts used across heavy-duty, industrial, and recreational applications.

Whether you are upgrading an existing charging system, replacing a worn drive component, or building a custom auxiliary alternator setup for a 12V, 24V, or 48V battery bank, selecting the correct pulley geometry is critical. The deep V-groove profile accommodates 1/2" (approx. 13mm) wide V-belts, offering increased surface contact and seating depth to minimise belt slippage under high electrical loads.

Key Features and Benefits

• Deep V-Groove Profile: Engineered for 1/2" (approx. 13mm) belts, the deeper groove geometry improves belt retention and reduces the risk of throwing a belt during high-RPM operation or sudden load changes.
• High-Output Ratio: The compact 2.7" (approx. 69mm) outer diameter helps maintain higher alternator rotor speeds at lower engine RPM, supporting strong charging output even when idling.
• Precision 17mm Bore: Machined to exact tolerances for a concentric, low-vibration fit on industry-standard 17mm alternator shafts, reducing premature wear on internal alternator bearings.
• Robust Metallic Construction: Built from durable metal with a protective passivated finish to resist corrosion, wear, and thermal stress in harsh engine bays and marine environments.

Why Upgrade to a Precision Deep-V Pulley?

High-output alternators place significant mechanical resistance on the drive belt, especially when recharging depleted lithium or AGM battery banks. Standard pressed-steel or shallow-groove pulleys can suffer from flex, out-of-round tolerances, and inadequate belt grip. This often leads to belt squeal, glazed belt surfaces, heat build-up, and reduced charging efficiency.

By utilising a solid, precision-machined deep-V pulley, you ensure consistent belt alignment and tension distribution. The deep groove walls provide superior lateral support, preventing the belt from rolling over or jumping out of the track when subjected to engine vibration or misalignment issues common in custom bracket installations.

Ideal Applications

This single V pulley is well-suited for mechanics, auto electricians, and DIY system builders working on:

• Marine Auxiliary Charging: Inboard diesel engines driving high-output alternators where moisture resistance and reliable belt tracking are paramount.
• 4WD and Caravan Dual Battery Systems: Custom secondary alternator installations requiring compact pulley diameters to maximise low-idle amperage.
• Industrial and Agricultural Machinery: Replacement pulley for worn or damaged drive sheaves on stationary engines, generators, and mobile plant equipment.
• Classic and Heavy-Duty Vehicles: Upgrading older single-belt drive systems to handle modern electrical loads safely and efficiently.

Secure Your Charging System Drive

Ensure your alternator delivers reliable performance without the frustration of belt slip or premature component wear. Order this precision 17mm bore Deep-V pulley today to complete your alternator installation or maintenance project with confidence.