Socket Head Bolts are round cylindrical headed bolt fasteners with hexagon hole or hex socket punched into the head of the bolt along and externally threaded body. Allen keys or hexagon keys are used for torqing socket head allen bolts. These bolts come with plain head or knurled head for thumb grip. Hexagon socket head and socket head allen bolts are aliases of socket head bolts. Socket head bolts are manufactured in high tensile, stainless steel, duplex steel and astm specifications. Socket head bolt dimensions are defined in both metric and imperials sizes with unified national coarse pitch (UNC), fine pitch (UNF), fixed pitch (UN) and iso metric thread profile. ASTM A574 is a dedicated material specification for socket head allen bolts.
Browse the page for information on socket head bolt manufacturing process, forming method, available sizes, sub-types, thread types, metric and imperial dimension standards, weight charts, torque values, material categories, grades and astm specifications.
Forming | Hot & Cold Forged |
Metric Size | M10 to M100 |
Imperial Size | 3/8 to 8" |
Threads | UNC, UNF, ISO, BSW & ACME. |
Standards | ASME,BS,DIN,ISO,UNI,DIN-EN |
Sub types | 1. Fully Threaded Socket Head Bolts 2. Partial Threaded Socket Head Bolts 3. Metric Socket Head Bolts 4. Imperial Socket Head Bolts |
ASME B18.2.1 | 3/8 inch to 3 inch |
BS 1769 | ½ inch to 2 inch |
ASME B18.2.3.6M | M12 to M36 |
ASME B18.2.3.7M | M16 to M36 |
DIN 6914 | M12 to M36 |
ISO 7412 | M12 to M36 |
UNI 5712 | M12 to M36 |
DIN-EN 14399-4 | M12 to M36 |