5551 Zinc Open End Bulge Lug Nut – 9/16" Thread, 19mm Hex, 0.827" Tall, 60° Degree
Part Number: 5551
Upgrade or replace your wheel hardware with this durable zinc-plated open end bulge lug nut, designed for secure and precise wheel mounting. The open end design accommodates longer wheel studs, while the 60° Degree conical seat ensures proper contact with compatible wheels.
Manufactured from strong steel with a corrosion-resistant zinc-plated finish, this lug nut is built for factory and aftermarket wheels requiring a 9/16" right-hand thread, 19mm hex, 0.827" overall height, and a 60° Degree conical seat.
Product Features
- Zinc-plated open end bulge lug nut
- Durable steel construction
- Open end design clears longer wheel studs
- Bulge seat for a wider seating surface
- 60° Degree conical seat
- 0.827" overall height
- 19mm hex drive
- 9/16" right-hand thread
- Designed for compatible factory and aftermarket wheels
- Suitable for replacement and custom wheel installations
Product Specifications
- Part Number: 5551
- Thread Size: 9/16"
- Thread Direction: Right-Hand Thread
- Hex Size: 19mm
- Overall Height: 0.827"
- Seat Type: Open End Bulge
- Seat Angle: 60° Degree Conical
- Material: Steel
- Finish: Zinc Plated
- Washer Included: No
- Wheel Lock Key Included: No
Important Fitment Information
Please confirm the 9/16" thread size, 19mm hex, 60° Degree conical seat, 0.827" overall height, and wheel mating surface before purchasing.
An incorrect thread size or seat style may result in improper wheel installation. Professional installation and tightening to the vehicle manufacturer's recommended torque specifications are strongly recommended.
Frequently Asked Questions
Will this 9/16" lug nut fit my wheels? It fits wheels that use a 60° conical (tapered) seat with 9/16" right-hand wheel studs. Confirm your stud thread size and the wheel's seat shape before ordering.
Why choose an open end lug nut instead of a closed end acorn nut? The open end lets extra-long or protruding wheel studs pass through the nut, so it seats fully where a closed end acorn nut would bottom out.
What size socket does it take? A 19mm socket. A thin-wall lug nut socket is recommended to avoid marking the wheel.
How many lug nuts do I need? Most vehicles use 4, 5, 6, or 8 per wheel. Order individually, by the 50-piece box, or by the 300-piece case.
Also Known As
9/16 open end lug nut, 9/16-18 lug nut, open end bulge acorn lug nut, 19mm hex wheel nut, 60 degree conical seat lug nut, zinc plated open end wheel nut, C-HORSE part 5551.