Hydrobolt Ltd.
Direct employees
Turnover (reported)
Regional Markets
Asia, Africa, Australia, Europe, North America, South America
Nuclear Contracting Tiers
Tier 5: Processors & Fabricators
Tier 4: Sub-component Suppliers/Distributors
Tier 3: Original Equipment Manufacturing Organisations
Tier 1: Technology Vendor including Reactor, Turbine, Major Civil, Mechanical & Electrical


  • Achilles UVDB Verify Cat A
  • ISO 9001
  • OHSAS 18001
  • PED 97/23/EC / ESPN (PED)

F4N Case Studies

Hydrobolt Ltd.


Manufacturer of special fasteners to drawings, in exotic materials, with additional testing.


Established in 1991, Hydrobolt is the UK market leader specialising in manufacturing high integrity fasteners for the energy industries. The types of fasteners Hydrobolt manufactures are special due to:
- unusual dimensions
- working to drawings
- special threads
- testing to customer and industry specs
- specific manufacturing methods (thread rolling, hot forging, CNC turning/milling...)
- documentation requirements

Key strengths include:
- right-first time attitude
- product integrity
- fully equipped in-house machine shop
- c.£5m inventory
- fully integrated ERP system
- industry experience and technical knowledge

Typical materials include Inconel (625, 718, 725, 800, 925...), Monel, Hastelloy, Ni Ali Bronze, Super Duplex, CrMoV high temp creep resistant steels, stainless steels (304, 316, 410, 630 17/4pH), 660....and often the material requires additional testing such as NDT or impacts at certain temperatures.

Products and Services

Product Sector
Fasteners and Bolting - High Integrity Subseas and Offshore
Fasteners and Bolting - High Integrity Petrochemical & Refining
Fasteners and Bolting - High Integrity Oil & Gas including LNG
Fasteners and Bolting - High Integrity Nuclear Defence - Naval Marine
Fasteners and Bolting - High Integrity Nuclear Civil

Studbolt manufacturing and stockist
Pipe fittings and flanges.

Site Facilities

Shop Floor


Specialist Machinery

Capability Swing Length Width Weight
5 Axis Milling Min: - - - N/A
Max: - 1500mm 1500mm 2000kg
Horizontal Milling (CNC) Min: - - - N/A
Max: 1500mm 1500mm - 2000kg
Horizontal Turning (CNC) Min: - - - N/A
Max: 600mm 3000mm - 2000kg

Inspection / Testing

  • CMM machines
  • Non destructive testing - Magnetic Partical
  • Non destructive testing - Ultrasonic
  • Proof Load Testing
  • Temperature controlled facility for inspection


  • CAD Design - 3D

Recent Work

Turbine Studs

Large high temperature creep resisting studs for EDF Nuclear.

Turbine Studs

Pressure Vessel Fasteners

Collar bolts for use in a pressure vessel on a nuclear power plant.

Pressure Vessel Fasteners

M180 studs X 4 mtrs long

Large double ended studs in CrMoV steel.

M180 studs X 4 mtrs long