Value Collection A996271 Left Hand Hex Jam Nut 5/8-18 Unf

Product Description

The VALUE COLLECTION A996271 is a 5/8-18 UNF left hand hex jam nut manufactured from steel with a zinc clear finish. Jam nuts are thin profile nuts used to lock a standard nut in place or to secure a threaded component where limited axial space is available. The left hand thread requires counterclockwise installation, making it essential for applications where shaft rotation or vibration would loosen a standard right hand nut. The zinc clear finish provides basic corrosion resistance for general industrial and mechanical service. Measuring 15/16 inches across the flats and 3/8 inches high, this nut fits standard hex wrench and socket tooling in the 5/8-18 UNF thread size.

Left hand hex jam nuts see use across a range of mechanical assemblies including motor shafts, fan hubs, conveyor components, and equipment where counter-rotation loads are present. HVAC and refrigeration technicians, maintenance mechanics, and industrial tradespeople encounter left hand threaded fasteners on blower wheel hubs, motor shaft retainers, and select equipment drive components. This nut is sold in a package quantity of 25, making it suitable for shop stock, service van inventory, or small assembly runs requiring multiple pieces.

Key Features

• Left hand thread prevents loosening under counter-rotation or reverse vibration loads
• 5/8-18 UNF thread form provides fine-pitch engagement for precise torque and positioning
• Steel construction for strength in general mechanical and industrial applications
• Zinc clear finish offers basic corrosion resistance
• Jam nut profile fits tight axial spaces where a full nut will not clear
• Package of 25 supports shop stock and multi-unit service jobs

Compatibility

Designed for use with any 5/8-18 UNF left hand threaded shaft, stud, or fastener assembly requiring a jam nut lock configuration in general industrial or mechanical service.

Installation Notes

Left hand threaded fasteners require counterclockwise rotation to tighten — confirm thread direction before installation to avoid cross-threading or damage to the mating component. A jam nut is typically run down against a primary nut or component face and tightened with two wrenches held in opposition to create a locking preload. De-energize and lock out any equipment before servicing threaded shaft or hub assemblies. Follow applicable equipment manufacturer torque guidelines and standard shop fastener practices.