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Aluminium Socket Countersunk Screws (DIN 7991)

Aluminium Socket Countersunk Screws are created to DIN 7991 standard and feature a hexagonal recess. They are driven using a hex wrench or insert bit, which makes them more efficient than slotted products.

The hex socket drive has a higher resistance to cam out and can be used with power drives, which enables faster use and higher achievable torque.

Countersunk screws are often used in applications that require an aesthetically pleasing finish as they sit flush in the target housing.

They are designed to be used in pre-drilled countersunk recesses.

There are a number of variants available also, including vented and captive.

Available from Fastenright as standard in M2 to M36 and in lengths from 3mm upwards, with specials available to order. Imperial diameters are also available.

Non-standard sizes are available to order as specials, including custom parts made to drawings.

Aluminium Socket Countersunk Screw

Technical Data & Available Sizes
Thread Diameter d2 (mm) k max. (mm) S min. (mm) t (mm) Pitch (mm) Available Lengths
M2
4.0 1.2 1.27 CALL 0.40 From 3mm
M2.5 5.0 1.45 1.5 CALL 0.45 From 3mm
M3 6.0 1.7 2.0 1.2 0.50 From 4mm
M3.5 7.0 CALL CALL CALL CALL From 5mm
M4 8.0 2.3 2.5 1.8 0.70 From 4mm
M5 10.0 2.8 3.0 2.3 0.80 From 6mm
M6 12.0 3.3 4.0 2.5 1.00 From 8mm
M8 16.0 4.4 5.0 3.5 1.25 From 10mm
M10 20.0 5.5 6.0 CALL 1.50 From 12mm
M12 24.0 6.5 8.0 CALL 1.75 From 16mm
M14 27.0 7.0 10.0 CALL 2.00 From 25mm
M16 30.0 7.5 10.0 CALL 2.00 From 20mm
M18 33.0 8.0 10.0 CALL 2.50 From 40mm
M20 36.0 8.5 12.0 CALL 2.50 From 30mm
M22 36.0 13.1 14.0 CALL 2.50 From 40mm
M24 39.0 14.0 14.0 CALL 3.00 From 30mm
M27 CALL CALL CALL CALL 3.00 CALL
M30 CALL CALL CALL CALL 3.50 CALL
M36 CALL CALL CALL CALL 4.00 CALL
Size not listed? Please make an enquiry – we may be able to provide it.
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