Square Nuts

Prime‑Line® square nuts provide strong, reliable fastening for applications where extra grip and alignment stability are needed. Designed with a four‑sided shape, these nuts offer increased surface contact that helps resist turning during installation and tightening, making them easier to secure than standard hex nuts in certain applications. Ideal for use in wood assemblies, metal framing, channel systems, furniture, machinery, and restoration projects, Prime‑Line square nuts are intended for use with same‑size matching bolts or machine screws to ensure proper fit and dependable holding power. Manufactured from quality materials for durability and consistent performance, they install easily using standard hand tools and deliver long‑lasting results. Trusted by DIY homeowners and professionals across the U.S., Prime‑Line square nuts make fastening more stable, secure, and efficient. Prime-Line Size: 4" H x 2.9" W x 0.6" D