FLYCLE Bulge Acorn Lug Nuts 1/2-20 20-Pack Black 1.4in 60° Conical Seat 19mm Hex

FLYCLE 20-pack black closed-end 1/2-20 bulge acorn lug nuts are durable, corrosion-resistant wheel fasteners engineered for many Jeep, Ford, Dodge, and aftermarket 5-lug wheels.

These lug nuts combine a classic acorn shape with a bulge acorn (bulge seat) design and a 60° conical seat to secure aftermarket wheels while offering a clean, finished appearance. Made from SCM435 cold-forged steel with additional heat treatment and a protective coating, they are machined to consistent dimensions: 1/2-20 thread, 1.4 inch (35.56mm) length, 22.1mm width, and a 3/4" (19mm) hex. This set of 20 is intended for aftermarket wheel applications that require the specified thread and seat type.

What vehicles and wheels are these lug nuts compatible with?

These lug nuts are compatible with many older and newer 5-lug vehicles when the wheel requires a 1/2-20 thread and a conical (60°) bulge acorn seat. Always confirm stud thread and seat type on your vehicle and wheel before purchase.

• Common fits: various Jeep Wrangler/TJ/CJ/KJ models, Ford Bronco and F-150 (selected years, 5-lug only), Dodge RAM and Nitro, Jeep Cherokee/Liberty/Grand Cherokee, and Mustang models noted in compatibility list.
• Designed specifically for aftermarket wheels that accept a bulge acorn (conical) seat.
• Not suitable for factory wheels that require different thread sizes or tapered/ball seats.

How strong and corrosion-resistant are these nuts?

Manufactured from SCM435 cold-forged steel and given an additional heat-treating step, these lug nuts are built for strength and long-term durability. The outer finish adds corrosion resistance while maintaining a black aesthetic that matches many aftermarket wheel designs.

• Material: SCM435 cold-forged steel for improved tensile strength.
• Heat-treated to enhance toughness under load and repeated torque cycles.
• Protective coating reduces rust and preserves appearance in typical road conditions.

Will these fit my wheel studs and with what wrench size?

The internal thread is 1/2-20, so they fit studs with 1/2-20 threading. The external hex is 3/4" (19mm), which is the wrench/socket size required to install or remove them safely and apply proper torque.

• Thread spec: 1/2-20 UNF standard thread pitch.
• Hex size: 3/4" (19mm) socket or wrench for installation and removal.
• Length and width: 1.4" (35.56mm) long and 22.1mm wide for clearance checks with aftermarket wheels.

What should I check before installing these lug nuts?

Before installation, verify your wheel’s seat type, the stud thread, and that the lug nut length clears any wheel opening or decorative center cap. Proper torque is important; use a calibrated torque wrench and follow the vehicle or wheel manufacturer’s torque specifications.

• Confirm wheel seat matches a 60° bulge acorn (conical) profile.
• Verify stud thread is 1/2-20; mismatch can damage studs or nuts.
• Check wheel clearance for 1.4" nut length and 19mm hex access.

Who is this for: These 20 black closed-end bulge acorn lug nuts are intended for owners and installers of aftermarket wheels on compatible 5-lug vehicles—especially Jeep, Ford, Dodge, and Mustang enthusiasts—who want a robust steel fastener with a finished appearance. They suit DIY mechanics, professional installers, and anyone replacing worn or mismatched lug nuts on aftermarket wheels that require a 1/2-20 thread and 60° conical seat. If you’re unsure about fitment, check your wheel and stud specifications or contact a wheel professional before ordering.