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Socket Countersunk Barrel Nuts

Socket countersunk head barrel nuts have a standard socket drive. Available with either through hole or blind hole (see stock size chart for availability). The countersunk socket barrel nut has a smooth barrel under the head keeping a smooth sleek look throughout.

Socket countersunk sex bolts are ideal in applications where a high strength, flush fixing is required, whereby the countersunk head sits flush into the pre counter-bore holes providing a sleek and continuous flow with the surface of the application.

Within the industry, they are also often referred to as sleeve nuts.

  • Countersunk to allow for a high strength, flush fixing.
  • Male screw fastens into internally threaded female barrel nut (sex bolt). Standard socket drive.
  • Head diameter matches standard DIN 7991 socket countersunk machine screws
  • Ideal for use in architectural applications
  • Available with through hole or blind hole (unless otherwise indicated)

Often used in products and projects where strength, aesthetics and health and safety could all be an issue as this fastener ticks all the boxes. The flush countersunk head reduces the risk of harm or injury by providing both pleasant aesthetic appearance and practicality with the smooth to touch head projection. The barrel diameter ranging from 4.5mm (M4) to 22mm (M16) also provides additional strength as well as an excellent means of joining.

Our socket countersunk head barrel nuts are available in A1 303 Stainless Steel and A4 316 Stainless steel, where the head diameters of the sleeve nut are manufactured to match the head diameter of standard DIN 7991 socket head countersunk screws.

Thread diameters from M3 to M16, with lengths ranging from 7mm to 27mm.

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

Slotted Raised Countersunk barrel nuts also available. See our full range of Barrel Nuts & Sex Bolts here.

Socket Countersunk Barrel Nuts technical drawing

Metric Technical Information & Available Sizes
Thread Diameter M3 M4 M5 M6 M8 M10 M12 M16
dk (mm) 6.0 8.0 10.0 12.0 16.0 20.0 24.0 30.0
k (mm) 0.8 1.8 2.1 2.3 2.8 3.3 4.4 5.4
d2 (mm) 4.5 5.0 6.5 8.0 11.0 14.0 16.0 22.0
l1 (mm) 7.0 12.0 15.0 16.0 20.0 16.0 20.0 20.0 25.0 25.0 27.0
l2 (mm) 4.0 7.0 9.0 9.0 12.0 9.0 12.0 11.0 12.0 13.0 15.0 14.0
M3 M4 M5 M6 M8 M10 M12 M16
7mm Stainless steel finishblack icon image
12mm Stainless steel finishblack icon image
15mm Stainless steel finishblack icon image
16mm Stainless steel finishblack icon image Stainless steel finishblack icon image
20mm black icon image* Stainless steel finishblack icon image Stainless steel finishblack icon image
25mm black icon image* Stainless steel finish
27mm black icon image*
downward arrow = A1 Stainless Steel // black icon image = A4 Stainless Steel // black icon image = Steel Zinc Plated
Parts with * are Blind hole only
Size not listed? Please make an enquiry – we may be able to provide it.

Socket Countersunk Barrel NutSocket Countersunk HeadtSocket Countersunk Sex Bolt Assembled

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