For EPC contractors and project procurement
Fasteners for EPC projects
TUFF® fasteners for refinery, power, bridge, railway and steel-structure projects, made by Pioneer Nuts & Bolts Pvt. Ltd. Forging, heat treatment, machining, finishing and testing are done in-house, in sizes M8 to M160, to standard or to your drawing.
Project fasteners
Heavy Hex BoltIS 3757, EN 14399-3, EN 14399-4 · M12 – M36, ½″ – 1½″
Tension Control BoltEN 14399-10, ASTM F3125, IS 3757 · M12 – M36
Foundation BoltIS 5624, DIN 529, ASTM F1554 · M8 – M72
Stud / Threaded RodASTM A193, ASTM A320, DIN 975 · M8 – M100, ½″ – 4″
Heavy Hex NutIS 6623, ASTM A194, ASTM A563 · M12 – M100, ¼″ – 4″
DTI WasherEN 14399-9, ASTM F959, BS EN 14399-9 · M12 – M36
Shear ConnectorISO 13918, AWS D1.1, EN ISO 14555 · Ø10 – 25 mm
Interlock WasherWedge-lock washer pair · M8–M36
By type of project
- Fasteners for refineries and oil and gas
- Fasteners for power and nuclear plants
- Fasteners for steel structures and buildings
- Fasteners for rail and road bridges
- Fasteners for railways
Full range: 37 product types
Structural bolting
Bolts and screws
- Allen Head Bolt
- Axle Cap Screw
- Countersunk Head Screw
- Fit Bolt
- Flange Bolt
- Heavy Hex Screw
- Hex Head Bolt
- Hex Screw
- Round Head Bolt / Screw
- Slotted CSK Screw
- Square Head Bolt
Nuts
- Castle Nut
- Flange Nut
- Heavy Hex Nut
- Hex Nut
- Jam Nut
- Lock Nut
- Nylock Nut
- Prevailing Torque Nut
- FS All-Steel Lock Nut
Washers
- Bevelled / Tapered Washer
- Chamfered / Machined Washer
- Ear Washer
- Interlock Washer
- Plain Washer
- Spring Washer
Studs, anchors and machined parts
Pins and rivets
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
- RefineryFasteners for the construction of the world's largest refinery (as of November 2026).
- NuclearFasteners to project specification for nuclear applications. Tested for strength at elevated temperature.
- BridgesStructural fasteners for major rail and road bridge projects.
- Road-over and foot-over bridgesBolting for road-over-bridges and foot-over-bridges over live railway lines.
- RailwaysFasteners for railway locomotives and passenger coaches.
- BuildingsFasteners for critical building structures.
- Steel structuresStructural bolting for heavy steel structures.
Questions
Which fasteners can TUFF supply for one project?
Structural bolts, tension control bolts, anchor and foundation bolts, stud bolts, nuts, washers and machined parts, in sizes M8 to M160, to Indian, ISO, DIN, EN, ASME and ASTM standards or to customer drawing.
How are lots tested, and do you accept third-party 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.
Which test certificates come with an order?
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.
Where have TUFF fasteners been used?
Fasteners for the construction of one of the world's largest refineries. Fasteners to project specification for nuclear applications. Tested for strength at elevated temperature. Fasteners for railway locomotives and passenger coaches. Structural fasteners for major rail and road bridge projects. Bolting for road-over-bridges and foot-over-bridges over live railway lines. Fasteners for critical building structures. Structural bolting for heavy steel structures.
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.