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Product Description Hillman Split Lock Washers keep threaded fasteners from working loose under vibration and repeated movement. Sized for a 5/16 inch bolt, the washer sits under a nut or bolt head and uses spring tension to keep constant pressure on the joint, so the fastener stays tight in equipment, machinery, and assemblies that shake or move in service. The split ring is the working feature: as the fastener is tightened, the ring compresses flat, and its two sharp cut ends dig into both the nut and the mating surface. Those biting ends resist the rotation that normally backs a nut off over time, giving a simple, reliable lock without any added parts or adhesives. Made from 18-8 stainless steel, the washer resists rust, corrosion, and staining while keeping its spring action intact. That lets it lock fasteners reliably in marine, coastal, and washdown settings where a plated or standard lock washer would corrode and lose its grip over time. Use these lock washers for marine, coastal, outdoor, and washdown settings such as boats, docks, railings, and exposed equipment where corrosion and vibration are both concerns. The stainless build also means the washer will not streak or stain the surrounding surface over time. This pack provides a ready supply for marine, dock, and outdoor fastening projects around the home and waterfront. From the Manufacturer This split lock washer provides a circular bearing surface with offset split ends which help bite into the mating material to provide a locking feature when tightened beneath a nut. It is round with a hole in the center and can be used where loosening from corrosion or vibration is a concern. Lock washers are commonly used in any application using a bolt where two pieces are being drawn together. LOCKS AGAINST VIBRATION: This split lock washer keeps a nut or bolt from working loose under vibration and movement, using spring tension to hold the fastener tight so bolted joints stay secure in equipment and moving assemblies. SPLIT SPRING DESIGN: Sized for a 5/16 inch bolt, the split ring spreads open under load and its sharp cut ends bite into the nut and the mating surface, resisting the back-off that loosens fasteners on machinery and vibrating equipment. 18-8 STAINLESS STEEL: Made from 18-8 stainless steel, the washer resists rust, corrosion, and staining while keeping its spring action, locking fasteners reliably in marine, outdoor, and washdown settings where plated washers would corrode. MARINE AND OUTDOOR USE: Ideal for marine, coastal, outdoor, and washdown environments where a lock washer must resist corrosion as well as vibration, a dependable choice for boats, docks, railings, and exposed equipment. TRUSTED HILLMAN QUALITY: Hillman supplies dependable fasteners and hardware that homeowners and pros rely on for everyday projects. Keep a supply of these washers on hand for assembly, mounting, and repair jobs around the home. UPC 008236142884 ASIN B000BDB8H0 Brand Hillman Color Stainless Steel Model 830668 Set Name Set of 100 Size Name 5/16 Metal Type Stainless Steel Unit Count 100 Count Item Weight 6.4 ounces Part Number 0830668 Thread Size 5/16'' Washer Type Split Lock Finish Types glossy Grade Rating Grade 18-8 Manufacturer The Hillman Group Fastener Size 5/16 Fastener Type Screw Mount Item Diameter 0.31 inches Material Type Stainless Steel Item Highlight Locks against vibration, spring ring bites in, resists rust and salt, fits 5/16 inch bolts, marine, outdoor, washdown ready Item Thickness 0.35 inches Item Type Name 5/16 SS SPLIT LOK WASHER Exterior Finish Ultra-Corrosion-Resistant Item Dimensions 2.31 x 2.68 x 1.56 inches Number Of Items 100 Number of Pieces 100 Outside Diameter 0.63 inches Screw Head Style Round Washer Application construction, general hardware Included Components Hardware; Fasteners & Hooks;lock-washers Washer Compatibility bolts, screws Inside Diameter Tolerance 0.31 inches Compatible Groove Diameter 0.31 inches Global Trade Identification Number 00008236142884