Mark Williams Enterprises® 51521 - Black Flat Seat Encapsulated Lug Nuts

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Universal Black Flat Seat Encapsulated Lug Nuts by Mark Williams Enterprises®. Thread Size: 3/8" x 24. Material: Aluminum. Quantity: 10 Pieces. The nut has a fixed counter bore depth that is equivalent to using the standard nut/washers combinations in the 1/8 and 3/8 thickness. The MW integral aluminum lug nuts are for applications where every ounce of weight is critical. The part is produced from 7075-T6 aluminum alloy with a durable anodized hard coat finish. The integral stainless steel washer snaps on to the nut and spins freely, but will not separate from the nut, preventing accidental loss. The nuts have fixed counter bore depths of 1/8" and 3/8" that make them equivalent to using a standard nut and washer combination of equal thickness. These nuts come standard with all MW titanium drive stud kits for the lightest possible combination. Can also be used with steel drive studs

Mark Williams Enterprises


  • Quality control ensures maximum reliability
  • Manufactured from first-rate materials
  • Proudly made in the USA

Mark Williams® manufactures a full range of racing axles, spools, rear end housings, steel, aluminum or carbon fiber driveshafts and disc brake kits. M-W also makes an assortment of chassis and driveline components at its Denver-area facility. All the parts required to set up 9” Ford, 12-bolt Chevy, 8.8 Ford, 8-3/4 Mopar and Dana 60 rear ends, including ring and pinion gears, Detroit Lockers, Posi-Traction differentials, and bearings are in stock at Mark Williams Enterprises. Special driveline and/or brake packages available for Acura, Camaro, Chevelle, Corvette, Fairlane, GM, Honda, Mustang, Mustang II and Pinto applications.

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This product is sold "as is" and without warranties of any kind, whether express or implied. To the fullest extent permissible pursuant to applicable law, the manufacturer disclaims all warranties, express or implied, including, but not limited to, implied warranties of merchantability or fitness for a particular purpose, and non-infringement. Some states do not permit limitations or exclusions on warranties, so the above limitations may not apply to you.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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