Prime-Line 9082381 Medium Split Lock Washers, 1/2 in., Hot Dip Galvanized Steel (25 Pack)

Prime‑Line lock washers are designed to help prevent nuts and bolts from loosening due to vibration, movement, or repeated use, providing added security in fastening applications. Commonly used in automotive repairs, appliances, machinery, furniture, and general home improvement projects, these washers create tension between the fastener and the mating surface to maintain a tight, reliable connection. Prime‑Line lock washers are intended for use with same‑size matching bolts, screws, and nuts to ensure proper fit and effective locking performance. Manufactured from quality materials for strength and durability, they install easily using standard hand tools and add an extra layer of stability without complex installation. Trusted by DIY homeowners and professionals across the U.S., Prime‑Line lock washers make it easy to achieve secure, vibration‑resistant fastening with confidence.

• Size: 1/2 inch
• Round washer with a split and helical shape
• When fully fastened, the edges at the split bite into the nut and material surface
• Provides a spring tension force that adds additional friction
• Helps to prevent nuts from loosening in cases where it may be subject to vibration, in some applications a flat washer is used with the split lock washer
• Specification(s) Met: ASME B18.21.1 and SAE J403