Category Archives: Power Generation

Insulated Bolts, Power Generation, Special Fasteners, Technical Bulletins

Insulated Bolts

Hague Fasteners have been manufacturing High Voltage Insulated Bolts for decades servicing the turbine and power generation maintainers and manufacturers.

Hague’s highest quality British manufactured Turbine Studs and Hex Bolts are wrapped with Epoxy Glass which is then finish machined to make the Insulated Fastener that can then be safely installed within the high voltage generator.

Turbine Rotor Insulated Bolts
Turbine Rotor Insulated Bolts

The bolts pictured are smaller items used in an 11.5kV generator with rotor expiration voltage of 500V.

Turbine Insulated Bolts & Assemblies

Insulating sleeves and washers made in flame retardant epoxy glass are often manufactured to suit the special insulated bolt manufactured typically to OEM designs and drawings.

Insulation Materials

Phenolic Glass B30 – For High temperature Applications

Silicone Glass B32 – For High temperature Applications

Polyimide Glass B34 – High Strength in High Temperature Applications

Epoxy Glass B36 – Superior Grade Laminate

Epoxy Glass B38 (FR) – For Flame Retardant Applications

Epoxy Glass B46 – Improved Machinability Laminate

Epoxy Glass B48 – For Applications At Elevated Temperature Where Good Mechanicals Are Required

Epoxy Glass FR4 Rod – For Flame Retardant Applications

Epoxy Glass G10 – For Commercial Applications

Epoxy Glass G10 QDX – Laminate With Multi-Axis Reinforcement

British Fasteners, British Manufacturing, Durehete 1055, Durehete Bolts, Durehete Fasteners, Power Generation, Special Fasteners

Durehete 1055

Durehete 1055 Fasteners

1% CrMoV Steel for bolting applications up to 570°C made in the UK by Hague Fasteners since 1971.

Durehete 1055 has been the ultimate choice material for high temperature applications up to 570°C for decades and Hague Fasteners have manufactured and supplied super critical turbine studs and capnuts for every British Power Station over their 45 year plus history.

Durehete 1055

Durehete 1055’s high temperature performance has been proven in these 45 plus years and the Durehete 1055 is now the only mainstream remaining Durehete grade surviving in production following the demise of Durehete Nut Steel (DNS) Durehete 900 and Durehete 950. The T41 Durehete 1055 specification was the original equipment specification for Alstom (GEC) and Siemens (Parsons) powerplants in the UK.

All of The Hague Fasteners Special Manufactured Fasteners are made in the UK at our own production facilities in the West Midlands.

All of the special Fasteners made by Hague Fasteners are dual certified to National Standards including ATD 1221004, NEI 221, BSEN 10269: 2013, 20CrMoVTiB4-10, Steel No. 1.7729, BSEN 1515-1: 1999, BS1506 681-820, CEGB GDCD STD2 ISS2, BS4882.

When it comes to the very best in Customer Service you need look no further than Hague Fasteners, critical power generation bolting since 1971.

Fastener Manufacturers, Power Generation, Special Fasteners, Stainless Steel Fasteners

B50A125E Bolts

B50A125E is a popular Creep resistant steel which is hardened and tempered to give critical reliability in high temperature applications with a usual upper continuous operating temperature limit of 580 degrees C.

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Hague Fasteners manufacture 422 stainless steel bolts and general special fastener products that are designed to be used at elevated high-temperatures whilst maintaining their high strength.

Hague’s special fasteners in B50A125E (422 Stainless Steel) are made to order and used commonly in thermal engines and power plants.

B50A125E (Alloy 422) is a hardenable stainless steel designed for use at temperatures of up to 1200ºF (649ºC). Alloy 422 has good resistance to scaling and oxidation.

Through heat treatment, high mechanical properties can be obtained.

Hague’s Alloy 422 Bolting is used in applications such as compressors or steam turbines and also in aircraft parts, valves, & other high temperature applications.

B50A125E Fastener Applications: Jet engine parts, high temperature bolting, compressor fasteners, steam turbine bolting, blades fasteners, aircraft components, engines bolts.

Specifications
B50A125E
422 Stainless
UNS S42200
B50A
AISI 616
AMS 5655
ASTM A 565 GRD 616
DOD F 24669/7
MIL S 861
B50A125
B50A951A1
BS 970 442S19
EN61

Contact, Custom Fasteners, History, Industries, Materials, Power Generation, Sheffield, Ship Building, Smestow School, Special Fasteners, Wolverhampton, Wolverhampton Schools Work Experience

Final Video Release by High School Work Experience Colleague Jack

Posted a little later than originally planned, we are really pleased with the final video created by Smestow School work experience colleague Jack during his work placement with us based on the history  & origins of Hague Fasteners Limited.

His inspiration for this video was Hague Fasteners founder Jack Hague’s origins in the industrial area around Sheffield in North England, leading to the creation and development of the company in the English Midlands city of Wolverhampton, which was back in 1971 part of Staffordshire.

The fledgling company of Hague Fasteners soon developed during the 1970s and 1980s into a global powerhouse of  fastener manufacturing and the video leads on to explore this proud tradition of producing custom fasteners for the UK Home Countries as well as for export to a wide range of industries around the world.

What an amazing tribute from one Jack to another.

The world has changed a lot since 1971.  Some industries have almost disappeared (Ship building), newer industries have been created (Renewable Energies in the Power Generation sector), but whatever your industry or location in the world we are here to assist you with any enquiry you may have for special fasteners. 

Please contact us today with your RFQs for any special fastener in any of the wide range of materials commercially available.

Bespoke Bolts, Custom Fasteners, Engineer studs, Fastener Manufacturers, Hague Fasteners, non-standard fasteners, Power Generation, Special Fasteners, studbolt, Studbolts, Tie Bars, UK Manufacturing, waisted studbolts

Experts in Manufactured Engineer Studs Since 1971

For over 4 decades, Hague Fasteners have excelled in the quality manufacturing of Engineer Studs.


From small diameter engineer studs for automotive use through large diameter High Pressure Turbine Casing Engineer Studs used in Power Generation facilities all around the World, Hague have the capacity to serve your Special Manufactured Fastener needs.

What is an Engineer Stud ?
There are various key identifiers when it comes to specifying an Engineer Stud. Many international standards exist and Hague can manufacture to the dimensions required under all standards or indeed a bespoke special stud can easily be made to your unique requirements and drawings.


The Metal End is the Stud End that is screwed into the existing component base or body. This is generally 1 or 1.5 times the nominal diameter as specified by purchaser or international standard.
TheNut End is the Stud End which is not screwed into the existing component. A nut is tightened into this shorter threaded end to secure the fixing.
The Plain portion is the part of stud which is not screwed. This shall be greater than 50% of the nominal dia and normally includes thread runouts.
Nominal length- The British Standard BS4439 identifies a range of Nominal lengths from 12mm to 500 mm. The nominal length is the plain portion length & the Nut Threaded End added together.
d – Hague regularly manufacture Engineer Studs in the diameter range M6 (1/4″) through M100 (4″).
Threads Notes
According to the BS4439 standard the threads on the nut end and on the metal end shall be in accordance with BS 3643 parts 1-3. The nut end shall be to the tolerance 6g (medium fit.). This is as normal for a general bolt. The metal end shall be to the tolerance of a close fit (4h) or an oversize tolerance as specified.
The tapped hole shall be to the tolerance 4H or, if it is not critical application a medium 6H tolerance can apply.
Be sure to give the Stud Experts a call with your next Engineer Stud requirements. Hague Fasteners are ready to manufacture for you.