Value Collection 31345 Lock Washer 5/16 in 100-pack

Product Description

The VALUE COLLECTION 31345 is a steel external tooth lock washer sized for 5/16 inch screws, zinc-plated for corrosion resistance. It features an external tooth profile that bites into the mating surface and fastener head under load, resisting loosening from vibration and torque. Rated at Grade 2 material, these washers are suited for general mechanical assemblies where a secure, vibration-resistant connection is required. Each washer measures 0.029 inches thick, with a minimum inside diameter of 0.320 inches and a maximum outside diameter of 0.601 inches. This package contains 100 washers.

External tooth lock washers in this size are commonly used in residential, commercial, and light industrial applications. Electricians, HVAC technicians, plumbers, and general mechanical tradespeople use them when fastening panels, brackets, junction boxes, equipment housings, and structural components where fastener loosening is a concern. The zinc-plated finish provides a degree of protection in mildly corrosive or humid environments. Sold in a package of 100, this quantity is practical for service vans, shops, and job-site kits.

Key Features

• External tooth profile grips mating surfaces under load to resist loosening from vibration
• Zinc-plated finish provides corrosion resistance for general-purpose use
• Grade 2 steel construction suitable for standard mechanical fastening applications
• 0.029 inch thickness with inside diameter range of 0.320 to 0.326 inches
• Outside diameter range of 0.588 to 0.601 inches for consistent coverage
• Package of 100 washers for shop, fleet, or job-site stocking

Compatibility

Designed for use with 5/16 inch screws and bolts in general mechanical, electrical, HVAC, and plumbing fastening applications where an external tooth lock washer is specified.

Installation Notes

Install with the teeth facing the fastener head or the mating surface, not between two hardened surfaces where the teeth cannot embed. Ensure the fastener and mating material are de-energized or depressurized before servicing any assembly. Standard hand tools are sufficient for installation. Follow applicable codes and manufacturer fastener specifications for torque and assembly requirements.