TUFF® · Nuts
Hex Nut
DIN 934 · ISO 4032 · IS 1364-3 · ISO 4034 · ASME B18.2.2
The hex nut is a common threaded fastener nut, a six-sided internally threaded fastener used in conjunction with a mating bolt, screw, or stud to clamp components together. Manufactured across the complete grade range from commercial Grade 4 through high-strength Grade 12, and in special alloy grades including Gr. B8 / B8M (ASTM A194) and Gr. 660 (A-286).
TUFF makes hex nuts in M8 – M160, ¼″ – 1½″, grades Gr. 4, Gr. 5, Gr. 6, Gr. 8, Gr. 10, Gr. 12, to DIN 934, ISO 4032, IS 1364-3, ISO 4034. Other sizes, grades and finishes to drawing.
Key facts
- Sizes
- M8 – M160, ¼″ – 1½″
- Grades / classes
- Gr. 4, Gr. 5, Gr. 6, Gr. 8, Gr. 10, Gr. 12, Gr. B8 (SS304), Gr. B8M (SS316), Gr. 660 (A-286), ASTM A563 Gr. A, B, C, DH
- Main standards
- DIN 934, ISO 4032, IS 1364-3, ISO 4034, ASME B18.2.2, IS 1364 Pt.3
- Finishes
- Hot Dip Galvanised, Black Phosphate, Electro Galvanised, PTFE Coating
- Made by
- Pioneer Nuts & Bolts Pvt. Ltd. (TUFF®), India
Hex Nut specification
Metric Series
| Parameter | Hex Nut |
|---|---|
| Standards | DIN 934 / ISO 4032 / IS 1364-3 · ISO 4034 · ASME B18.2.2 |
| Sizes we make | |
| Grades | ISO 898-2 property classes apply up to M39. Above M39, proof load and hardness by agreement or to drawing. |
| Dimensional Standards | IndianIS 1364 Pt.3: Hexagon nuts, style 1 GermanDIN 934: Hexagon nuts, product grades A and B European / InternationalEN ISO 4032: Hexagon regular nuts, product grade A/B · EN ISO 4034: Hexagon regular nuts (style 1), product grade C AmericanASME B18.2.2: Hex nuts, inch series OtherJIS B 1181: Hexagon nuts (Japan) · AS/NZS 1112: ISO metric hex nuts (Australia/NZ) |
| Chemical & Mechanical | IndianIS 1367 Pt.6: Mechanical properties of nuts InternationalISO 898 Pt.2: Mechanical properties of nuts · EN ISO 898-2 American (alloy grades)ASTM A194: Alloy grade nuts (B8, B8M, 2H) · ASTM A563: Carbon & alloy hex nuts · ASTM A453: Gr. 660 (A-286) |
| Surface Finish | Hot Dip GalvanisedIS 1367 Pt.13 · IS 4759 · BS EN 1461 · ASTM A153 · ASTM A123 Black PhosphateIS 1367 Pt.12 Electro GalvanisedIS 1367 Pt.11 · IS 1573 PTFE CoatingPTFE / fluoropolymer, to purchaser specification |
Inch Series
| Parameter | Hex Nut |
|---|---|
| Sizes we make (inch) | |
| Grades | |
| Dimensional Standards | ASME B18.2.2: Hex nuts, inch series · BS 4190: ISO metric black nuts (reference) |
| Chemical & Mechanical | ASTM A563 · ASTM A194 · ASTM A453 · ISO 898 Pt.2 |
| Surface Finish | Hot Dip GalvanisedIS 1367 Pt.13 · IS 4759 · BS EN 1461 · ASTM A153 · ASTM A123 Black PhosphateIS 1367 Pt.12 Electro GalvanisedIS 1367 Pt.11 · IS 1573 PTFE CoatingPTFE / fluoropolymer, to purchaser specification |
Specification as offered by TUFF. Ranges, grades and finishes outside this table are made to drawing. Send your requirement to sales@tuffbolt.com.
Standards for hex nut
Indian Standards (IS / BIS)
- IS 1364 Pt.3: Hexagon nuts, style 1 (standard hex nut), dimensions
- IS 1367 Pt.6: Mechanical properties of nuts with specified proof load values
- IS 4759: Hot-dip zinc coatings on structural steel and other allied products
- IS 1573: Electroplated coatings on fasteners
- IS 1367 Pt.13: Hot dip galvanised, process requirements
- IS 1367 Pt.12: Black phosphate on fasteners
- IS 1367 Pt.11: Electro galvanised on fasteners
ISO International Standards
- ISO 4032: Hexagon regular nuts (style 1), product grade A and B
- ISO 4034: Hexagon regular nuts (style 1), product grade C (commercial / black)
- ISO 898-2: Mechanical properties of nuts with specified proof load values
- ISO 4759-3: Tolerances for fasteners, nuts
- ISO 965-1: ISO metric screw threads, tolerances (for nut threading)
German / European (DIN / EN / BS)
- DIN 934: Hexagon nuts, style 1 (primary DIN standard for standard hex nut)
- EN ISO 4032: Hexagon regular nuts, product grade A and B
- EN ISO 4034: Hexagon regular nuts (style 1), product grade C
- EN ISO 898-2: Mechanical properties of nuts with proof load values
- BS 4190: ISO metric black hexagon bolts, screws and nuts
- BS 3692: ISO metric precision hexagon bolts, screws and nuts
- BS EN 1461: Hot dip galvanised coatings on fabricated iron and steel articles
American Standards (ASME / ASTM)
- ASME B18.2.2: Hexagon nuts, inch series (standard hex nut section)
- ASTM A563: Carbon and alloy steel nuts
- ASTM A194: Nuts for high pressure and high temperature service (alloy grades)
- ASTM A453: High-temperature bolting, Gr. 660 (A-286) nuts
- ASTM A153: Hot dip galvanised coatings
- PTFE / fluoropolymer coating, to purchaser specification (corrosion test per ASTM B117 / ISO 9227)
Critical applications
- Mates with hex bolts and screws of the same property class in structural and machinery joints
- Railway rolling stock and track equipment
- Power, cement and steel plant equipment mountings
- Pipe supports and skid frames in oil and gas plants
Typical uses of this product type. Project references on request.
Hex Nut: questions
What Indian standard governs Hex Nut dimensions?
IS 1364 Pt.3 specifies the dimensions for hexagon nuts, style 1 (standard hex nut) in India. IS 1367 Pt.6 governs the mechanical properties. Note: IS 1363 Pt.3 covers style 1 hexagon nuts in product grade C; heavy hex structural nuts are covered by IS 6623.
What is the difference between EN ISO 4032 and EN ISO 4034?
EN ISO 4032 covers hexagon regular nuts (style 1), product grade A and B, with tighter dimensional tolerances. EN ISO 4034 covers hexagon regular nuts (style 1), product grade C, with wider tolerances for black commercial applications such as structural steelwork and construction.
What grade of hex nut is matched with Grade 8.8 bolts?
Grade 8 hex nut (ISO 898-2 / IS 1367 Pt.6) is the standard pairing for Grade 8.8 bolts. For Grade 10.9 bolts, Grade 10 or Grade 12 nuts are specified. For ASTM A193 B7 studs, ASTM A194 Grade 2H heavy hex nuts are the normal pairing (other A194 grades where the design code specifies).
Are hex nuts available in Grade B8M (Stainless Steel 316) for corrosive environments?
Yes. Gr. B8M (Austenitic Stainless Steel 316) hex nuts conforming to ASTM A194 are manufactured for marine, chemical processing, food industry, and offshore applications requiring full corrosion resistance.
Why are galvanized nuts tapped oversize?
The zinc layer on a galvanized bolt thread needs clearance, so nuts are galvanized as blanks and then tapped oversize; the zinc on the bolt protects the nut thread. Oversizing lowers thread-stripping strength, which is why higher-strength nuts are paired with galvanized structural bolts.
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.