Socket head cap screw DIN 912 / ISO 4762, hex socket AF 17, M 20x55, steel 10.9 plain (black)

Where the screw head has to disappear flush into a counterbore, this DIN 912 socket head cap screw works with M 20 and 55 mm length. Head diameter 30.0 mm and head height 20.0 mm define the counterbore, and the tool engages in the AF 17 hex socket. The material is steel 10.9 plain (black).

Benefits

• Dimensions to DIN 912 and ISO 4762, therefore interchangeable with existing M 20 joints.
• The AF 17 hex socket transmits the tightening torque without wrench flats on the head.
• Property class 10.9 allows higher preload than 8.8 at the same size M 20.
• The thread running nearly up to the head uses the full length of 55 mm for engagement.
• Head diameter 30.0 mm at 20.0 mm head height to DIN 912, matching a cylindrical counterbore.

Applications

• Hydraulic and pneumatic power units
• Highly loaded flange joints
• Drive and gearbox engineering
• Clamping fixtures in tool making

Standards and conformity

The screw is dimensioned to DIN 912 and ISO 4762, which allows replacement of like-for-like parts in M 20. The material is stated as steel 10.9 plain (black).