Bolt Head Standards Table

Hex Bolt Head Standards Chart (DIN 931 / DIN 933)

Hex bolt heads to DIN 931 (partial thread) and DIN 933 (full thread) have clearly defined across-flats widths (S) and head heights (K) for each thread size — for example, an M12 has a 19 mm head width and a 7.5 mm head height. This data helps you select the right wrench, set drilling clearances, and design assemblies with precision.

Samakkee Salukpan manufactures hex-head bolts to international standards in carbon steel, alloy steel, and stainless steel, with a wide range of surface-plating services.

Socket Head Cap Screw (DIN 912 / ISO 4762)

Countersunk Socket Head / Flat Head (DIN 7991 / ISO 10642)

Flat Countersunk Nib Bolt / Square Neck (DIN 604)