LRQA 9001 2015

Tension Control Bolts Ltd is certified to ISO 9001, ISO 14001 and ISO 45001.

We operate a quality management system in accordance with ISO 9001 and NHSS 3, maintaining full traceability of our products from their initial source of supply through to despatch to the customer.

Quality is at the forefront of everything we do, and we are proud of the outstanding reputation we have created over the last 30 years whilst becoming the market leader in tension control bolting.

ISO 14001 is the internationally recognized standard for environmental management systems. By adhering to this standard, we are recognized for our dedication to ensuring proactive measures to minimize our environmental footprint, complying with relevant legal requirements, and achieving our environmental objectives.

ISO 45001 specifies requirements for an occupational health and safety management system. This standard provides a framework which enables us to systematically assess hazards and implement risk control measures, leading to reduced workplace injuries, illnesses and incidents.

Through continuous improvement we will meet or exceed our customers’ needs and expectations in product, service and support. The company constantly monitors its performance and implements improvements where appropriate.

Quality Certificates

Please visit our Downloads section for all quality documentation.

Quality Control

quality testingTo ensure our products conform to all relevant standards and specifications, TCB operate in-house testing equipment, including:

  • Tensile testing to ISO 898-1
  • Nut proof load testing to ISO 898-2
  • Suitability for preloading to EN 14399-2
  • Suitability test for calibrated preload to EN 14399-10
  • Hardness testing to ISO 6508-1 and ISO 6507-1
  • Tri-Roll Thread Comparators

Tension Control Bolts Ltd are approved suppliers to:

  • ABB
  • Alstom Power
  • Alstom Transport
  • AMCO
  • Amec
  • Amey
  • Arqiva
  • Babcock International Group
  • Balfour Beatty
  • BAM Nuttall
  • Bechtel
  • Canary Wharf Contractors
  • Chun Fai Construction
  • Culham Engineering
  • Cimolai
  • Costain
  • Dawnus Construction
  • Dragages
  • EDF Energy
  • Ferrovial
  • Fletcher Construction
  • Galliford Try
  • Gammon Construction
  • Hip Hing Construction
  • Hsin Chong Construction
  • Interserve
  • Kier Group
  • Lagerwey
  • Laing O'Rourke
  • LendLease
  • Mace
  • Meinhardt
  • Morgan Sindall
  • Multiplex
  • Murphy Group
  • Novarka
  • Samsung C&T
  • Siemens Gamesa
  • Sir Robert McAlpine
  • Sisk Group
  • Spencer Group
  • Skanska
  • Stobart Rail
  • Tekfen
  • Vinci PLC
  • VolkerWessels UK
  • Wates


Tension Control Bolts are specified by consulting engineers including:

  • Aecom
  • Arcadis
  • Arup
  • Atkins
  • Black & Veatch
  • Buro Happold
  • Capita Property and Infrastructure
  • Cass Hayward
  • COWI
  • Halcrow
  • Jacobs
  • Mott MacDonald
  • O'Connor Sutton Cronin
  • Pell Frischmann
  • Ramboll
  • Roughan & O'Donovan
  • Royal Haskoning DHV
  • SKM
  • Tony Gee & Partners
  • URS Global
  • W A Fairhurst
  • Waterman Group
  • WSP Global
  • Tetra Tech


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Greenkote® anti-corrosion protection

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