AUTOPTIM 7/16-20 Spline Lug Nuts 20-Pack Chrome Closed-End with Socket — 60° Taper, Cold-Forged Steel

AUTOPTIM 7/16-20 spline lug nuts are a 20-piece set of chrome, closed-end, one-piece wheel nuts supplied with a matching socket for secure, rust-resistant wheel fastening.

These lug nuts are engineered to replace or upgrade factory wheel fasteners on vehicles using a 7/16-20 thread. Built as one-piece, cold-forged steel units with a conical 60° seat and a chrome finish, the set includes twenty nuts and an installation socket to simplify mounting and removal. The closed-end design keeps contaminants out of the thread, while the supplied socket fits the spline profile for a snug, anti-slip engagement.

How do these lug nuts fit my vehicle?

The AUTOPTIM set uses a standard 7/16-20 UNF thread and a tapered 60° seat, which matches many aftermarket and OEM wheels that specify that thread and seat angle. Confirm thread pitch and seat type on your hub or original lug nut before purchasing to ensure compatibility. The external 17 mm hex helps with socket access where space allows.

• Thread size: 7/16-20 UNF — verify against your studs
• Seat type: 60° conical/tapered — common for many wheels
• Hex width: 17 mm — standard tool compatibility
• Length/width: 35 mm length, 20 mm body width — fits typical lug recesses

What makes the construction durable and rust-resistant?

Each nut is cold-forged and heat-treated as a single solid piece to minimize weak points that can cause cracking under load. A triple-layer chrome finish adds corrosion resistance and simplifies cleaning, especially in regions with road salt or frequent moisture. The closed-end body further protects internal threads from dirt and moisture, helping maintain a reliable, long-term fit.

• One-piece forged steel reduces fracture risk
• Heat treatment improves strength and fatigue life
• Triple chrome plating resists corrosion and pitting
• Closed-end design blocks contaminants from threads

How does the included socket help with installation?

The kit’s socket is shaped for the spline profile of the nuts so it engages securely without slipping or marring the nut face. Using the supplied socket ensures even torque transfer when tightening or loosening nuts and reduces the chance of rounding. It’s convenient for home mechanics and pros alike and fits standard 1/2" drive tools or compatible wrenches depending on your setup.

• Spline-fit socket prevents stripping and surface damage
• Compatible with common torque tools for correct tightening
• Designed for easy hand-start then torque to factory spec
• Useful for both installations and routine wheel maintenance

Who is this for? This AUTOPTIM kit is ideal for car owners, hobbyist mechanics, and professional shops replacing worn lug nuts or upgrading to a closed-end, chrome finish for corrosion protection and cleaner looks. Choose this set if your vehicle uses 7/16-20 studs and a 60° seat, and you want a durable, one-piece nut that resists rust while providing dependable thread engagement. If you’re unsure about fitment, compare these specifications with your vehicle’s manual or consult a wheel specialist prior to installation. AUTOPTIM also offers 12 months of customer support if you need help after purchase.