Value Collection 30771 Split Lock Washer 5/16 in Silicon Bronze 25pk

Product Description

The VALUE COLLECTION 30771 is a silicon bronze split lock washer sized for 5/16 inch screws. Split lock washers create tension under a fastener head or nut to resist loosening caused by vibration and torque relaxation. The 30771 is made from silicon bronze, which offers corrosion resistance in marine, coastal, and chemical environments where steel fasteners are unsuitable. With a nominal inside diameter of 0.314 inches and an outside diameter of 0.583 inches, this washer is a standard helical spring type that seats cleanly against fastener bearing surfaces. Plumbers, marine maintenance technicians, electricians, and general contractors working in corrosive conditions use these washers in structural and mechanical assembly work.

These split lock washers are suited for use in residential and commercial applications where corrosion resistance is a priority. Silicon bronze is commonly specified in saltwater-adjacent environments, on copper piping assemblies, and on electrical panel work where galvanic compatibility with copper or brass hardware is needed. This 25-piece pack supports single-job use or small-batch stocking. The washer conforms to ASME B18.21.1, the governing standard for helical spring lock washers in inch fastener systems.

Key Features

• Silicon bronze construction resists corrosion in marine, coastal, and chemical service environments
• Helical split design applies spring tension to resist fastener back-out under vibration
• Conforms to ASME B18.21.1 dimensional standard for inch-series lock washers
• Inside diameter range of 0.317 to 0.326 inches fits standard 5/16 inch fastener shanks
• Outside diameter range of 0.586 to 0.596 inches provides consistent bearing surface coverage
• Sold in a 25-piece pack with a minimum order quantity of 1 pack

Compatibility

Designed for use with 5/16 inch screws and bolts in applications requiring an inch-series helical split lock washer meeting ASME B18.21.1.

Installation Notes

Install the split lock washer between the fastener head or nut and the mating surface, with the open ends of the helix facing down toward the workpiece. Tighten the fastener until the washer is fully compressed flat. Do not reuse split lock washers after full compression, as the spring tension is not recoverable. Follow all applicable mechanical and electrical codes for the specific assembly being fastened.