Covid-19 - Fastenright is open for business for all fastener and fixing enquiries. Orders are being processed and despatched as normal.

Header fastener image

Security Fasteners and General Fixings from Stock and to order

Click Now for a Quote

Call +44(0) 1902 457734

Twitter Icon Facebook Icon LinkedIn Icon Skype Icon

Clutch Head Security Barrel Nuts & Sex Bolts

Tamper Proof Clutch Head Security Sex Bolts Protect Against Vandals and Thieves, Offering:

  • Medium Security Resistance
  • Permanent one-way drive
  • Usable for medium torque applications
  • Ideal for use in architectural staircasing and balustrading

A security sex bolt is a tamper-proof adaptation of the commonly known sex bolt, also known as a barrel nut, barrel bolt, Chicago screw, architectural bolts or post and screw.

This is a type of tamper-proof security fastener which has a barrel-shaped flange and protruding boss that is internally threaded. The boss sits within the components being fastened, and the flange provides the bearing surface.

The security sex bolts, including a male and female bolt, and the accompanying tamper-proof security machine screw sit flush on either side of the surfaces being fastened.

It is often chosen because of its low profile compared to other fasteners. It has a built-in security drive feature to aid in tightening the fastener.

They can also be referred to as a sleeve nut within the industry.

  • Male screws are available with or without shoulders.
  • All parts are matched for a finished appearance.
  • Both female and male bolts feature the security drive.
  • Head dimensions for both male and female parts are matched.
  • Button Head, Truss Head and Countersunk head available.
  • Made to individual customer requirements.
  • Can be manufactured in steel or stainless steel.

Please contact us with your requirements to further your enquiry.

Gauge / Length 1/2″ 5/8″
10-24 UNC Marker-image Marker-image


Clutch head barrel nuts technical drawing

10-24 UNC A (mm) B (mm) C (mm)
1/2″ 10.9< 12.6< 6.3<
5/8″ 10.9< 15.9< 6.3<

*For guidance purposes only

Clutch Head One Way Barrel NutClutch Head One Way Male ScrewClutch Head One Way Sex Bolt Sets