Power and nuclear
Fasteners for power and nuclear plants
Bolting for power plant equipment and structures: stud bolts and heavy hex bolts, including Gr. 660 (A-286) for high-temperature service, with anchor and foundation bolts in M8 – M72. For nuclear applications, fasteners are made to the project specification. Tested for strength at elevated temperature.
TUFF products for this work
Stud / Threaded RodASTM A193, ASTM A320, DIN 975 · M8 – M100, ½″ – 4″
Heavy Hex BoltIS 3757, EN 14399-3, EN 14399-4 · M12 – M36, ½″ – 1½″
Heavy Hex NutIS 6623, ASTM A194, ASTM A563 · M12 – M100, ¼″ – 4″
Foundation BoltIS 5624, DIN 529, ASTM F1554 · M8 – M72
Hex Head BoltDIN 931, ISO 4014, IS 1364-1 · M8 – M160, ¼″ – 4″
Testing and inspection
Every lot is tested before dispatch to the applicable standard and the order's inspection plan, in our in-house laboratory accredited by NABL to ISO/IEC 17025:2017 for the tests in its scope. Lots have been inspected on customer orders by agencies including TÜV SÜD, TÜV NORD, Lloyd's Register, DNV, SGS, BVQI, RITES and EIL.
In an independent test by Element Materials Technology, Singapore (report T24-56832R, November 2024), one TUFF M22 class 10.9 HSFG bolt reached 1,221 MPa tensile strength against the ISO 898-1 minimum of 1,040 MPa. This is one sample; results vary by size, grade and lot, and the test certificate of each supplied lot governs. Read the test summary.
Test certificates
We issue test certificates with every lot. State the certificate type your order needs, for example EN 10204 3.1 or 3.2, in the enquiry.
Shipping terms
FOB, CIF or other terms, as agreed for the order.
Send an enquiry
Send the standard, grade, size, quantity, finish and the certificate type your order needs. Open the enquiry form or write to sales@tuffbolt.com.
Where TUFF fasteners have been used
- NuclearFasteners to project specification for nuclear applications. Tested for strength at elevated temperature.
Questions
Are stud bolts available in Grade 660 (A-286) for high-temperature applications?
Yes. Stud bolts in Gr. 660 (A-286, iron-base superalloy) conforming to ASTM A453 / ASTM A638 are manufactured for bolting assemblies at elevated temperatures up to approximately 650°C, used in steam turbine casings, petrochemical high-temperature reactors, and advanced power plant flanged joints.
Can you supply Heavy Hex Bolts in Gr. 660 (A-286) for high-temperature service?
Yes. These are used in power generation, petrochemical, and refinery applications where standard carbon or alloy steel fasteners are not suitable.
Are heavy hex nuts available in Gr. 660 (A-286) for high-temperature service?
Yes. Grade 660 (A-286) heavy hex nuts conforming to ASTM A453 are manufactured for high-temperature bolting assemblies in power generation, petrochemical, and refinery applications requiring service up to approximately 650°C.
About the maker
- Fasteners since 1996Pioneer Nuts & Bolts Pvt. Ltd., brand TUFF®. Forging, heat treatment, machining and finishing in-house.
- 50 yearsMetallurgy and heat treatment, since 1976.
- IATF 16949:2016Certified quality management system.
- NABL labIn-house laboratory accredited by NABL to ISO/IEC 17025:2017 for the tests in its scope. Lots tested to the applicable standard.
- Japanese collaborationTechnical collaboration with Japanese fastener companies.
- 150+ testimonialsMore than 150 customer testimonials.