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Pin Hex Countersunk Security Barrel Nuts

Pin Hex Countersunk Security Barrel Nuts

  • Pin Hex security drive
  • Countersunk to allow for a high strength, flush fixing
  • Male screw fastens into internally threaded female barrel nut (sex bolt).
  • 90 degree countersunk head
  • Ideal for use in architectural applications requiring a security fixing
  • Manufactured in A4 stainless steel for superior corrosion resistance
  • Male pin hex countersunk screw available here

Pin Hex countersunk security barrel nuts are available in A4 Stainless Steel in the following sizes, on short lead times.
Other sizes and materials available to order. 

Thread / Length (mm) 7 12 15 16 20 25 27


Description: Pin Hex Countersunk Security Barrel Nuts

Pin Hex Countersunk Security Barrel nuts are now available to order within relatively short lead times. Featuring a socket drive with a solid pin within the recess, these tamper resistant barrel nuts are supplied in A4 stainless steel as standard meaning that they are suitable for applications exposed to salt water.

Also known as sex bolts, these barrel nuts feature an internally threaded barrel that a screw of the same thread will fasten into in order to clamp material together. To calculate the required screw length, it is crucial to take into account both the length of the barrel nut and the length of the internal thread. Please note that the length of a countersunk barrel nut is measured as the overall length.

Pin hex countersunk security screws in A2 stainless steel are also available to suit these barrel nuts, with A4 stainless steel screws available to order, although any screw of the same thread can be used.

Pin Hex Countersunk Security Barrel Nuts technical drawing

D D2 L1 L2 K DK
M5 6.5 15.0 9.0 2.1 10.0
M6 8.0 16.0 9.0 2.3 12.0
M6 8.0 20.0 12.0
M8 11.0 16.0 9.0 2.8 16.0
M10 14.0 20.0 12.0 3.3 20.0
M12 16.0 25.0 13.0 4.4 24.0
M16 22.0 27.0 14.0 5.4 30.0

*For guidance purposes only

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