For buyers in the USA
ASTM and ASME fasteners made in India
TUFF® nuts and bolts, anchor bolts, structural bolts, studs and washers that Pioneer Nuts & Bolts Pvt. Ltd. makes to ASTM, ASME and AWS standards. Each line shows the standards named on that product's page and the size range; open it for grades, finishes and dimensions.
Structural bolting
- DTI WasherASTM F959 · M12 – M36
- Heavy Hex BoltASTM F3125, ASME B18.2.6, ASTM A490 Type 1, ASTM F3125 Gr. A325 / A490, ASTM A307 Gr.A & B · M12 – M36, ½″ – 1½″
- Shear ConnectorAWS D1.1, ASTM A108, ASTM A108 Grade 1010–1020 cold-finished · Ø10 – 25 mm
- Tension Control BoltASTM F3125, ASTM F3125 Gr. F1852 (A325 strength), ASTM F3125 Gr. F2280 (A490 strength) · M12 – M36
Bolts and screws
- Allen Head BoltASME B18.3, ASME B18.3.1M, ASTM A574M, ASTM A574, ASTM A193 Gr. B7 · M8 – M100, 5⁄16″ – 4″
- Axle Cap ScrewASME B18.3 · M8–M24
- Flange BoltASME B18.2.3.4M, ASME B18.2.3.9M · M8 – M20
- Heavy Hex ScrewASME B18.2.3.3M, ASME B18.2.6, ASME B18.2.6M, ASTM A490 Type 1, ASTM F3125 Grade A325, ASTM A193 Grade B7, ASTM A320 Grade L7/L7M, ASTM A193 Grade B8/B8M · M12 – M36
- Hex Head BoltASME B18.2.1 · M8 – M160, ¼″ – 4″
- Round Head Bolt / ScrewASME B18.5 · M8 – M20
- Slotted CSK ScrewASME B18.6.3 · M8 – M20
- Square Head BoltASME B18.2.1, ASME B18.2.3.10M · M8 – M24
Nuts
- Castle NutASME B18.2.2 · M8 – M100
- Flange NutASME B18.2.4.4M · M8 – M20
- Heavy Hex NutASTM A194, ASTM A563, ASME B18.2.2, ASME B18.2.4.6M · M12 – M100, ¼″ – 4″
- Hex NutASME B18.2.2, ASTM A563 Gr. A · M8 – M160, ¼″ – 1½″
- Jam NutASME B18.2.2 · M8 – M64
- Lock NutASME B18.16.3M · M8 – M39
- Prevailing Torque NutASTM A563 Gr. A & B · M8 – M39
Washers
- Bevelled / Tapered WasherASME B18.22M · M8 – M39
- Chamfered / Machined WasherASTM F436 · M8 – M100
- Spring WasherASME B18.21.1, ASME B18.21.2M · M8 – M100
Studs, anchors and machined parts
- Foundation BoltASTM F1554 · M8 – M72
- Stud / Threaded RodASTM A193, ASTM A320, ASME B16.5, ASTM A193 Gr. B7 · M8 – M100, ½″ – 4″
- Trunnion PinASME B18.8.1 · 8mm–100mm
- U BoltASME B18.31.5 · M10 – M24
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
Do you make ASTM F3125 A325 and A490 structural bolts?
Yes. TUFF heavy hex structural bolts are made to ASTM F3125 Gr. A325 / A490 in M12 – M36 and ½″ – 1½″.
What is the difference between A325 and A490 bolts?
Both are grades of ASTM F3125. Grade A325 has a minimum tensile strength of 120 ksi and Grade A490 150 ksi. A490 bolts must not be hot-dip or mechanically galvanized; only the zinc-aluminium coating of ASTM F3393 is permitted for them.
Do you make anchor bolts to ASTM F1554?
TUFF foundation and anchor bolts are made in M8 – M72, and ASTM F1554 is among the standards they are made to.
Do you make stud bolts to ASTM A193 Gr. B7?
Yes. TUFF stud bolts and threaded rod are made to ASTM A193 and ASTM A320, including Gr. B7, in M8 – M100 and ½″ – 4″.
Are inch sizes available?
Yes, on these products: heavy hex bolts ½″ – 1½″, hex head bolts ¼″ – 4″, heavy hex nuts ¼″ – 4″, hex nuts ¼″ – 1½″, Allen head bolts 5⁄16″ – 4″ and stud bolts ½″ – 4″.
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.
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.