Origin: ImportedSocket head cap screws are bolts (cap screws) with a hexagonal recessed driveAlso know as Allen bolts, they are driven with a hex key or Allen wrenchSocket cap screws are popular in tight spaces where an Allen wrench would fit when another type of drive may notCommonly used in machinery and assembliesDiameter: M20 Drive Type: Internal Hex Finish: Plain Head Diameter: 29.67 - 30.33 mm Head Diameter Max: 30.33mm Head Height: 19.48 - 20.00 mm Head Height Max: 20mm Head Style: Socket Industry Standard: DIN 912 Item: Socket Cap Screw Key Size: 17 mm Length: 50 mm Material: A2 Stainless Steel Measurement: Metric Origin: Imported Specification: DIN 912 Tensile Strength : 101500 psi Thread Length: 50 mm Thread Type: Coarse Type: Full Threaded