Balmar K-8 2.4" 8 Rib Serpentine Pulley with 17mm Bore Short (STD)

High-Torque 8-Groove Serpentine Pulley for Alternator and Auxiliary Drives

When configuring or maintaining a heavy-duty power generation system, the mechanical link between your engine and alternator is critical. This K-8 2.4" (Approx. 61.0mm) serpentine pulley is engineered to provide consistent, slip-free power transmission in high-load environments. Designed with a standard 17mm bore and a short (STD) offset configuration, it serves as a direct-fit solution for high-output alternators and auxiliary drive components across marine, commercial, and off-grid mobile applications.

Precision Machining for Belt Longevity

High-amperage alternators place significant mechanical load on engine drive belts, especially during bulk charging phases. Lower-tier or poorly machined pulleys often suffer from microscopic surface imperfections and runout issues, leading to premature belt wear, glazing, and audible belt squeal. This 8-rib serpentine pulley is precision-machined to exacting tolerances, ensuring that the belt tracks straight and seats properly across all eight grooves. By maximising the surface contact area, it handles higher torque loads efficiently and reduces the risk of belt slippage under heavy electrical demand.

Key Features and Benefits

• 8-Rib Serpentine Profile (K-8): Offers increased surface contact area compared to standard v-belts or narrower serpentine profiles, making it ideal for driving high-output 12V, 24V, and 48V alternators.
• Compact 2.4" (Approx. 61.0mm) Diameter: Optimises the drive ratio to achieve higher alternator rotor speeds at lower engine RPMs, significantly improving charge output at idle.
• Integrated Keyway: Features a precision-machined internal keyway within the 17mm bore to provide a positive, non-slip mechanical lock on keyed shafts.
• Yellow Zinc Plated Finish: Treated with a durable protective coating that resists rust and corrosion in harsh engine bays and humid marine environments.
• Stamped Part Identification: Clearly marked with part number 1310 on the face for straightforward identification during routine maintenance or fleet servicing.

Engineered to Reduce System Risks

Upgrading your charging system requires components that can withstand continuous thermal and mechanical stress. Using an under-specified pulley can result in catastrophic belt failure, leaving vessels or remote vehicles without primary charging capabilities or engine cooling. The robust steel construction and corrosion-resistant finish of the 1310 pulley prevent pitting and surface degradation along the belt grooves. Furthermore, the integrated keyway mitigates the risk of the pulley spinning on the alternator shaft during sudden load spikes or engine deceleration.

Typical Applications

This short-configuration K-8 pulley is widely utilised by auto electricians, marine technicians, and custom system builders for:

• Upgrading standard alternators to heavy-duty serpentine belt drives
• Secondary engine-mounted alternator installations in 4WDs, caravans, and commercial trucks
• Marine auxiliary power generation where corrosion resistance and belt grip are paramount
• Replacing worn or damaged pulleys in industrial machinery and off-grid generator setups

Upgrade Your Drive System

Ensure your high-output charging system operates with maximum mechanical efficiency and reliability. Add the K-8 2.4" (Approx. 61.0mm) 17mm Bore Serpentine Pulley to your build list today for a secure, long-lasting belt drive installation.