case-hardened steel

or other materials requiring a stronger fastener

5 DIN 985 Locknuts are crafted with A4 stainless steel with a nylon insert

3/8-16 x 2 1/4 Grade 5 Hex Cap Screw Plain Domestic USA (100)

3/8-24 x 1 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (900)

1-8 x 2 3/4 A325 Type 1 Heavy Hex Bolt Plain Domestic (USA) - Bulk Keg (225) M24-3.00 Socket Cap Screws 12.9 Alloy Plain DIN 912 case-hardened steelThis high quality heavy hex bolt is manufactured with 1 8 x 2 3 4 A325 Type 1 steel, designed to meet the highest standards of strength and durability. Made in the USA, each convenient bulk keg contains 225 bolts for easy installation and maximum efficiency.