Industries · Power generation
Power generation fasteners for turbines, boilers and plant
HAGUE FASTENERS makes power generation fasteners in the UK: high temperature turbine studs, waisted studbolts, 12-point bolts and insulated bolts, made in our Willenhall facility in creep resisting steels and nickel alloys for nuclear, gas, coal, hydro and renewable plant.
B16
Plus Durehete 900, 950 and 1055
80A
Nimonic, Inconel 718 and other superalloys
QC1
Nuclear safety release where required
1971
Supplying British power generators since
Heat, load and time
Bolting that holds its grip at temperature
HAGUE FASTENERS makes power generation fasteners in the UK and has worked with British power generating companies since 1971. Around the world we have made bolting for nuclear, coal, gas and hydro-electric plant, and for the companies that maintain them.
At steam turbine and boiler temperatures, an ordinary bolt slowly creeps and its clamp load relaxes, so a joint that was tight at commissioning can leak by the next outage. That is why turbine casings and valve chests are bolted with creep resisting grades such as B16, Durehete and Nimonic, made and heat treated to tight limits.
Where our fasteners go
- Turbine manufacturers
- Boiler systems
- Coal, oil and nuclear power plant maintenance
- Hydro-electric power plant
- Natural gas storage and plant maintenance
- Geothermal power plants
- Motors and generators
- Transmission, distribution and storage equipment
- Research and design projects
Materials
Materials for high temperature service
Grade selection depends on operating temperature, design life and the casing material. The grade supplied always follows your specification.
| Group | Grades we machine |
|---|---|
| Creep resisting steels | Durehete 900 (T22), 950 (T31) and 1055 (T41), Esshete 1250, 21CrMoV57, ASTM A193 B16 |
| Martensitic stainless steels | Jethete M152 and M448, AISI 422, 17/4PH |
| Nickel superalloys | Nimonic 80A, Waspaloy grades, Inconel 600, 601, 625 and 718 |
| Corrosion resistant alloys | Hastelloy C4, C22 and C276, Monel 400 and K500, Incoloy 800H/HT, 825 and 925, 904L (Uranus B6), Carpenter 20 (CB20) |
Products
Power generation fasteners we make
Waisted studs
Reduced shanks for controlled stretch and fatigue life.
Double-ended studbolts
Casing and valve chest studs.
12-point bolts
Bi-hex bolts and screws, ferryheads.
Dome and cap nuts
Cap nuts to protect thread ends.
Insulated bolts
Including glass mica insulated bolts.
Pole screws and specials
Turned and milled parts to drawing.
Outages and breakdowns
Replacement studs when the clock is running
Outages run to tight schedules, and a seized or cracked stud found on strip-down cannot wait months. We hold stocks of high temperature steel and superalloy bar, so breakdown orders can start straight away, with heat treatment and testing managed through our approved partners.
- Elevated temperature tensile and stress rupture testing
- Hardness and Charpy impact testing
- MPI and ultrasonic testing
- EN 10204 3.1 and 3.2 certificates
- Laser-marked heat codes on every stud
Questions
Frequently asked questions
What materials are used for power generation fasteners?
For high temperature joints, creep resisting grades such as ASTM A193 B16, Durehete 1055, A453 660 and Nimonic 80A are typical; Inconel 718 is used where higher strength is needed. The specification sets the grade.
Why do turbine bolts need special materials?
Because at high temperature ordinary steels creep and lose clamp load over time. Creep resisting steels and nickel alloys keep their preload for longer between outages.
Why are turbine studs often waisted?
A waisted shank lets the stud stretch more for the same load, which helps hold preload and improves fatigue life. We make waisted studs to drawing.
Can you make replacement studs during an outage?
Yes. With certified bar in stock, urgent breakdown and outage orders can start straight away.
Do you supply nuclear power plant fasteners?
Yes. Safety-critical parts are released under First Level QC1 procedures. See nuclear fasteners.
Planning an outage?
Send us the stud schedule or drawing
Tell us the grade, sizes, quantity and test requirements and we will quote quickly.