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6 Lobe Pin TX Countersunk Security Barrel Nuts & Sex Bolts

Previously only available as button head fasteners, these 6 Lobe Pin TX Countersunk Security Barrel Nuts & Sex Bolts offer an off-the-shelf solution for applications requiring a flush finish. These security barrel nuts offer a medium level of security and are suitable for high torque use.

They are also known as sex bolts or Chicago screws and feature an internally-threaded barrel in which a matching screw can be fastened into. It is important to consider both the hole diameter and the thickness that you are closing when deciding which size will be suitable.

These 6 Lobe Pin TX Countersunk Security Barrel Nuts are often used with a matching 6 Lobe Pin TX Countersunk Security Machine Screw for applications where both sides are exposed to potential tampering or theft, but can be used with any machine screw of the correct size.

  • All parts can be matched for a finish appearance.
  • Ideal for use in architectural stair casing and balustrade.

Available as standard in A2 Stainless Steel, with sizes from M4 to M10 and lengths ranging from 12mm to 27mm. 6 Lobe Pin TX Button Head Security Barrel Nuts & Sex Bolts are also available at Fastenright.

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

Pin Torx Countersunk Barrel Nut Technical Drawing

Technical Data & Available Sizes
Thread Diameter M4 M5 M6 x 20mm M8 M10 x 27mm
DK (mm) 7.6 9.8 11.8 14.7 19.5
A (mm) 12.0 15.0 20.0 20.0 27.0
C (mm) 5.2 6.3 7.8 9.8 12.7
D (mm) 8.0 12.0 14.0 17.5
Available Sizes M4 M5 M6 M8 M10
12mm
16mm
20mm
25mm
27mm
black icon image = Available
Size not listed? Please make an enquiry – we may be able to provide it.

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