Imperial Socket Head Cap Screws

Socket head cap screws, often called Allen cap screws, have a tall cylindrical head with a hex socket drive. Imperial sizes are needed when repairing or matching machinery built to inch threads, and BS 2470 is the British standard for inch socket screws.

This range runs from #4 number sizes up to 1 1/2", plus BA sizes from 8BA to 0BA. Threads include UNC and UNF (Unified coarse and fine), BSW and BSF (British Standard Whitworth and Fine) and BA, in bare and zinc plated finishes.

Check the thread form as well as the diameter, because they do not interchange. For stainless, see Imperial Stainless Steel Socket Head Cap Screws.

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