Weld nuts are designed to be specifically welded with another nut, tip or object to provide better structural strength and durability. Raptor Supplies offers a wide range of adapters, nuts, tips, bases, rings, cones, screws & more, from brands like 3M, American Torch Tip, Grainger & Norton. 3M disc-retainer nuts securely fasten a fibre disc to 3M disc pad hubs, disc holders or face plates and are used with a rotary power tool. These nuts feature 1/4 inch diameter holes to easily fit a spanner wrench for fastening into holes. American Torch Tip copper adapter tips are ideal for Mazak laser welders. They are available in 1, 1.2, 1.5, 1.8, 2, 2.5 & 4 mm sizes.