Metric DIN 7991 hexagon socket cap screws have a flat countersunk head with an internal hexagonal drive suited for a hex / Allen key or wrench. The internal drive is ideal for situations where externally wrenched screws are impractical such as in applications where limited space is available. Bhalla Fasteners offers an extensive range of metric DIN 7991 hexagon socket cap screws in both mm and inches dimensions. Diameters ranging from M4to M20 in lengths up to 150mm
While holding the key insert the key into the socket and apply the torque on the nut .The torque be applied on the screw itself it should be reduced accordingly.
Bhalla Fasteners is the leading manufacturer, supplier and exporter of Din7991 screw used in wood applications in USA ,UK ,Poland, Germany , Austrailia, Ireland, and European countries