DIN 933 / DIN 931 Black Hex Bolts and Nuts

Hotop Fasteners supplies DIN 933 / DIN 931 black hex bolts and nuts for machinery, structural assembly, construction, industrial equipment, and general fastening applications. Manufactured from carbon steel materials such as 35K and 45# steel, these fasteners are available in multiple strength grades, including 4.8, 6.8, 8.8, 10.9, and 12.9. The black oxide finish gives the product a clean industrial appearance and makes it a practical choice for mechanical assembly and hardware supply.