Lock Washers

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. Prime-Line Size: 4.15" H x 3.65" W x 0.5" D