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Security Fasteners and General Fixings from Stock and to order

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2-Hole C/sunk Security Barrel Nuts & Sex Bolts

2 hole countersunk security sex bolt sets, to protect your application from thieves and vandals.

  • Medium security resistance
  • Reusable 2-way drive
  • Suitable for low torque applications
  • Used in architectural stair casing and balustrading

All 2-Hole Countersunk Security Sex Bolts are made to order to customer specification.

Tamper Resistant 2-Hole Countersunk Head Security Barrel Nut (Sex Bolt Sets) – availability within 2 weeks (depending on quantity)


  • Male screws available with or without shoulders.
  • All parts are matched for a finished appearance.
  • Both female and male bolts feature the 2-hole Security Drive requiring a special tool or bit to fasten.
  • Head dimensions for both male and female parts are matched.
  • Security sex bolts (Male – Female Screws) are made to individual customer requirements.
  • Truss and Pan Head are also available.
  • Can be manufactured in steel, A2 stainless steel or A4 stainless steel.
  • Other security drives are also available including Pin TX, Pin Hex, Clutch Head and Wave.

2-Hole Countersunk Security Sex Bolt

2-Hole Countersunk Security Sex Bolts are tamperproof version of the commonly known sex bolt, also known as a barrel nut, barrel bolt, male female bolt, Chicago screw, architectural bolts or post and screw.

The security barrel nut takes its name from barrel-shaped flange present on the fixing, with a protruding boss that is internally threaded. The boss sits within the components being fastened, and the flange provides the bearing surface.

Countersunk security barrel nuts and their accompanying tamperproof security machine screw are normally chosen in applications that require a smooth, finished appearance as they sit flush in either side of the surfaces being fastened.

2-Hole Countersunk Barrel Nut2-Hole Countersunk Male2-Hole Tool

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