Check the listing for details. 3/8-16 Hex Cap Nuts Solid Brass Grade 360 Commercial Plain Finish Quantity 10. Condition: New. Listed at 16.19 USD. 3/8-16 Hex Cap Nuts Solid Brass Grade 360 Commercial Plain Finish Quantity 10 Acorn nut is its common name and it is also called a crown hex nut, blind nut, cap nut or domed cap nut. It is a nut that has a domed top to cover the threads. This is to prevent contact with the external thread to protect the threads or protect other things the threads would rub against. A closed nut having a domelike cap over the back, protruding part of the engaged screw or bolt. Cap nuts, also referred to as acorn nuts are used to cover exposed bolt ends and add a finished appearance. These cap nuts are composed of a solid brass hex nut and top cap. General Product Information Drive Style : Socket Drive Size : 5/8" Thread : 3/8-16 Material : Brass 360 Quantity of Fasteners in Package : 10 Detailed Product Information: Width - Flat to Flat : 5/8" Overall Height : 1/2" Threads Per Inch (TPI) : 16 Thread Depth : 1/4" Coarse or Fine Thread : Coarse Thread Direction : Right Hand Shipping: All orders placed before 3:30 pm EST Will Ship Same Day Tracking is provided on ALL Orders Priority Mail Shipping service is offered at a discount of only $3.95 UPS Ground UPS Next Day Air is available, Please inquire for pricing Returns : ALL returns are accepted if returned within 60 days. Money Back or exchange guaranteed. NO Restocking Fees. For YOU, we constantly strive to find ways of improving our performance.