Products · Studs
Waisted studs
Waisted studs and bolts for high temperature and cyclically loaded joints, made to DIN 2509 and DIN 2510 or your drawing.
DIN 2510
Plus DIN 2509 and OEM drawings
1 to 500
Single prototypes to batches of several hundred
UK, EU, US
Mill origin of every bar we use
3.1 / 3.2
EN 10204 certificates with full traceability
About Waisted studs
Elastic studs for demanding joints
Waisted studs have their shank machined down to below the thread root diameter. The thinner shank stretches more evenly under load, so the stud holds its preload better and resists fatigue under cyclic and thermal loads. HAGUE FASTENERS makes waisted studs in the UK, including larger diameters, longer lengths and through-drilled studs.
They are used in turbines, high temperature flanges and engines, so our expertise in high temperature grades, super duplex and critical stainless steels matters here.
Where waisted studs are used
- Steam and gas turbine casings
- High temperature pipework flanges
- Engine cylinder heads and con rods
- Valve bonnets in power plant
- Joints under vibration or thermal cycling
Options
Typical specifications
Typical options. We make to the standard or drawing you specify.
| Option | What we make |
|---|---|
| Form | Waisted shank below thread root, through drilled for heating rods on request |
| Thread | Metric coarse and fine, UNC, UNF, UN, BSW, BSF and special forms, cut or rolled |
| Strength | Classes 8.8, 10.9, 12.9 and 14.9; ASTM A193 B7, B16, B8 and B8M; A320 L7; A453 660, Nimonic 80A |
| Standards | DIN 2509, DIN 2510 |
| Finishes | Self colour, zinc, zinc nickel, zinc flake (Geomet, Delta Protekt), hot dip galvanising, electroless nickel, PTFE fluoropolymer, phosphate or passivation |
| Documentation | Certificate of conformity, EN 10204 3.1 or 3.2, test reports, dimensional reports and FAIR |
Materials
Materials we use
Certified bar from UK, EU and US mills. See all fastener materials.
- Carbon and alloy steels: B16, BS 4882 B16A, Durehete 1055, 21CrMoV5-7 and 24CrMo5
- Stainless steels: A453 660, B8M, 17-4PH and Nimonic 80A
- Inconel: 718 and X750
- Duplex and super duplex: S32750 and S32760
- Incoloy: A286 and 800HT
Manufacture and quality
Made in Willenhall, certified to release
Turned and threaded in our own Willenhall facility, with batches on automatic bar machines, from certified UK, EU and US bar.
- Heat numbers traced from mill to release
- Heat treatment, NDT and coating by approved partners
- UKAS-accredited testing where specified
Questions
Frequently asked questions
What is a waisted stud?
A waisted stud has a shank reduced below the thread root diameter, so it stretches more evenly and keeps its preload under cyclic and thermal loads.
Why use waisted studs instead of plain studs?
Waisted studs improve fatigue life and hold preload better in hot, vibrating joints such as turbine casings and high temperature flanges.
What standards cover waisted studs?
DIN 2509 and DIN 2510 cover waisted studs and bolting for high temperature flanged joints. We also make them to OEM drawings.
Can you make through-drilled waisted studs?
Yes. We drill waisted studs through their length for heating rods when specified, so they can be heated and tightened by thermal extension.
Useful tools
Free engineering tools
- Bolt torque calculator: tightening torque and preload for metric, UNC, UNF, BSW and BSF threads.
- Stud bolt weight calculator: weigh studs and nuts for one piece or a whole order, in kg and lb.
- Thread size chart and identifier: pitch, diameters, stress area and tapping drill, or identify an unknown thread.
Free to use, no sign-up. See all our engineering tools.
Waisted stud enquiry?
Send us the drawing or the standard
Send the drawing with the material, testing and quantity, and we will quote quickly.