For buyers in Europe and the UK
EN, DIN and ISO fasteners made in India
TUFF® fasteners and fixings that Pioneer Nuts & Bolts Pvt. Ltd. makes to EN, DIN and ISO standards, including EN 14399 structural bolting assemblies. Each line shows the standards named on that product's page and the size range; open it for property classes, finishes and dimensions. TUFF fasteners have been supplied to buyers in Europe.
Structural bolting
- DTI WasherEN 14399-9, BS EN 14399-9, BS 7644 · M12 – M36
- Heavy Hex BoltEN 14399-3, EN 14399-4, DIN 6914 · M12 – M36, ½″ – 1½″
- Shear ConnectorISO 13918, EN ISO 14555, EN ISO 13918, EN 1994-1 · Ø10 – 25 mm
- Tension Control BoltEN 14399-10 · M12 – M36
Bolts and screws
- Allen Head BoltDIN 912, ISO 4762 · M8 – M100, 5⁄16″ – 4″
- Axle Cap ScrewISO 4762 · M8–M24
- Countersunk Head ScrewDIN 7991, ISO 10642, DIN 963, DIN 965 · M8 – M24
- Fit BoltDIN 609, DIN 610, DIN 7968, ISO 286-1 · M8 – M52
- Flange BoltDIN 6921, ISO 4162, ISO 15071 · M8 – M20
- Heavy Hex ScrewEN 14399-3, DIN 6914 · M12 – M36
- Hex Head BoltDIN 931, ISO 4014, DIN 931-2, ISO 4016 · M8 – M160, ¼″ – 4″
- Hex ScrewDIN 933, ISO 4017, ISO 4018, EN ISO 4017 · M8 – M64
- Round Head Bolt / ScrewDIN 603, ISO 8677, BS 4933 · M8 – M20
- Slotted CSK ScrewDIN 963, ISO 2009, EN ISO 2009, BS 450 · M8 – M20
- Square Head BoltDIN 478, DIN 480, BS 916 · M8 – M24
Nuts
- Castle NutDIN 935, BS 1768 · M8 – M100
- Flange NutDIN 6923, ISO 4161, EN ISO 4161 · M8 – M20
- Heavy Hex NutEN 14399-3 · M12 – M100, ¼″ – 4″
- Hex NutDIN 934, ISO 4032, ISO 4034 · M8 – M160, ¼″ – 1½″
- Jam NutDIN 439, ISO 4035, EN ISO 4035, EN ISO 4036 · M8 – M64
- Lock NutDIN 980, ISO 7042, ISO 10513 · M8 – M39
- Nylock NutDIN 985, ISO 10511, DIN 982, ISO 7040, EN ISO 10511, EN ISO 7040 · M8 – M48
- Prevailing Torque NutDIN 980, ISO 7042, DIN 980-V, DIN 980-M, DIN 982, DIN 985 · M8 – M39
Washers
- Bevelled / Tapered WasherDIN 434, DIN 435, BS EN 14399-5 · M8 – M39
- Chamfered / Machined WasherDIN 125-B, ISO 7090, EN 14399-5, EN 14399-6 · M8 – M100
- Ear WasherDIN 93, DIN 432, DIN 463, DIN 981, DIN 5406, ISO 2982-2 · M8 – M100
- Plain WasherDIN 125, ISO 7089, ISO 7090, ISO 7091, DIN 9021, ISO 7093-1 · M8 – M160
- Spring WasherDIN 127, DIN 127-B, DIN 128-A · M8 – M100
Studs, anchors and machined parts
- Foundation BoltDIN 529, BS 7419 · M8 – M72
- Precision ShaftEN 10278, ISO 286-1, ISO 286-2 · 8mm–200mm
- Stud / Threaded RodDIN 975, DIN 976-1, BS 4882 · M8 – M100, ½″ – 4″
- Trunnion PinISO 2340, ISO 2341, DIN 1443, DIN 1444 · 8mm–100mm
- U BoltDIN 3570 · 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
Which EN 14399 products do you make?
TUFF heavy hex bolts are made to EN 14399-3 (system HR) and EN 14399-4 (system HV), tension control bolts to EN 14399-10, DTI washers to EN 14399-9 and hardened washers to EN 14399-5 and EN 14399-6.
Do you make DIN 931 and DIN 933 hex bolts?
Yes. TUFF hex head bolts are made to DIN 931 and ISO 4014 in M8 – M160, and hex screws to DIN 933 and ISO 4017 in M8 – M64.
What is the difference between EN 10204 3.1 and 3.2 certificates?
A 3.1 inspection certificate is issued by the manufacturer's authorised inspection representative, independent of production, and reports the actual test results for the lot. A 3.2 certificate is in addition validated by the purchaser's representative or a third-party inspector.
Have TUFF fasteners been supplied to Europe?
Yes. TUFF fasteners have been supplied to buyers in Europe.
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.