countersunk tcbCountersunk (CSK) TCB assemblies are available in limited diameters and lengths.

All countersunk TCBs from Tension Control Bolts Ltd are:

  • High strength structural bolting assemblies for preloading, System HRC
  • Property class 10.9/10
  • Manufactured in accordance with EN 14399-10
  • CE marked in accordance with EN 14399-1
  • Supplied with superior corrosion protection Greenkote®
  • Available primarily in M16, M20, M22, M24 & M30 diameters in specific lengths

Countersunk TCBs can be used for any application where space is restricted. Countersunk bolts are also aesthetically pleasing from an architectural perspective.

countersunk picture

Countersunk TCBs from Tension Control Bolts Ltd return the same preload values as a standard TCB assembly, however the length of a CSK TCB is measured from the top of the bolt, rather than the underside of the head.

Typical applications for CSK TCBs include:

High Rise
Countersunk TCBs are increasingly being specified for high rise commercial offices. Particularly in city centre buildings where rental rates are charged at a premium.

The use of a countersunk bolt will generate extra floor space per bolt per connection per floor, cumulatively generating substantial additional revenue for landlords. Designed with the high rise market in mind, the new GSUL corner shear wrench is designed specifcially for use in narrow splice joints.

Many bridges have incorporated CSK TCBs especially box girder bridges.

Sliding Doors
As the CSK head does not protrude from the steelwork, CSK TCBs have been incorporated into a range of aircraft hangar doors.

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To request a quote or for more information about our products, please contact us.

Greenkote® anti-corrosion protection

Tension Control Bolts Ltd has its own metal coating plant producing an environmentally friendly process called Greenkote®, which is comparable to galvanising, although it is harder wearing and readily accepts all paint systems. Learn more about Greenkote.