Socket Head Cap Screws (SCHS), also known as Hex Socket Head Cap Screws or Allen Head Screws, feature a cylindrical head with a recessed hex socket designed for Allen key engagement. These screws are available with either a knurled or plain head, depending on the application requirement.
SCHS are manufactured in both metric and imperial sizes, typically up to 4 inches in length. Common dimensional standards for these fasteners include DIN 912, ISO 4762, and ANSI/ASME B18.3. For high-tensile applications, ASTM A574 is the widely recognized grade specification used in producing alloy steel socket head cap screws.
