Standards Guide

Fastener standards explained.

Understand what the number on a drawing actually controls: dimensions, thread, strength, material, coating, structural assembly, inspection or certification.

The basic rule

One fastener can carry several standards.

A specification may combine an ISO/DIN product form, an ISO/ASTM mechanical grade, a thread standard, a coating standard and a documentation requirement. They are different layers, not competing names for the same thing.

Standard family

Dimensions & product form

12 REFERENCES

ISO 4014Metric hex bolts with partial thread

ISO 4017Metric hex screws threaded to head

DIN 931 / DIN 933Legacy hex bolt / screw references

ISO 4762 / DIN 912Socket head cap screws

ISO 10642 / DIN 7991Countersunk socket screws

ISO 7380Button-head socket screws

ISO 4032 / DIN 934Regular hex nuts

ISO 4035 / DIN 439Thin/jam nuts

ISO 7089 / DIN 125ANormal-series plain washers

ISO 7090 / DIN 125BChamfered washers

DIN 976-1Threaded rods / studs

IS 3063 / IS 6735Indian spring-washer section standards

Standard family

Mechanical properties & materials

12 REFERENCES

ISO 898-1Carbon/alloy steel bolt property classes such as 8.8, 10.9, 12.9

ISO 898-2Nut property classes

ISO 3506-1Stainless bolts/screws such as A2-70, A4-80

ISO 3506-2Stainless nuts

SAE J429SAE inch bolt grades 2, 5 and 8

ASTM A307General carbon-steel bolts/studs

ASTM A449Quenched-and-tempered general bolts

ASTM A574Alloy-steel socket head cap screws

ASTM A193Pressure/high-temperature bolting: B7, B8, B8M, B16 etc.

ASTM A194Matching pressure-service nut grades such as 2H, 8, 8M

ASTM A320Low-temperature bolting such as L7/L7M

ASTM F1554Anchor-bolt material grades 36, 55 and 105

Standard family

Structural bolting

9 REFERENCES

ASTM F3125Structural bolt grades including A325 and A490

ASTM A563Structural/general carbon-alloy nuts

ASTM F436/F436MHardened structural washers

EN 15048Non-preloaded structural bolting assemblies

EN 14399Preloaded high-strength structural bolting assemblies

IS 3757Indian high-strength structural bolts

IS 6623Indian high-strength structural nuts

IS 6649Indian hardened structural washers

IS 4000Indian practice for high-strength bolted structural joints

Standard family

Threads & tolerances

5 REFERENCES

ISO 261 / ISO 262Preferred ISO metric diameter and pitch series

ISO 965 familyISO metric thread tolerances such as 6g / 6H

ASME B1.1Unified inch threads including UNC, UNF and 8UN

ASME B1.13MMetric M-profile screw threads in ASME system

UNC / UNF / 8UNThread series must be stated separately from material grade when needed

Standard family

Coatings & corrosion

8 REFERENCES

ISO 1461Hot-dip galvanized coating on fabricated iron/steel articles

ASTM F2329/F2329MHot-dip zinc coating specifically for fasteners

ASTM A153/A153MHot-dip zinc coating on iron/steel hardware

ISO 4042Electroplated coating systems for fasteners

ISO 10683Non-electrolytically applied zinc-flake coatings

ASTM F1941/F1941MElectrodeposited coatings on fasteners

ISO 9223Atmospheric corrosivity classes C1–CX

ISO 12944 familyProtective-coating environment and durability terminology

Standard family

Inspection & documents

6 REFERENCES

ISO 3269Fastener acceptance inspection

EN 10204 3.1Specific inspection certificate from manufacturer

EN 10204 3.2Specific inspection with independent/purchaser validation as defined

MTC / MTRIndustry terms for material/test certificate; actual content must match contract

COCCertificate of conformity / compliance declaration

ITP / QAPProject-specific inspection and quality plan, not a universal fastener standard

How to write an unambiguous enquiry

Give the product, dimensional standard, nominal size and length, thread system/pitch, material or property class, finish/coating, quantity, required nut/washer set, certificate/inspection requirement and delivery location. If a drawing controls the geometry, send the drawing revision with the enquiry.

Use the Standards Cross Reference to identify legacy/current designations and the Thread & Dimension Lookup for common dimensional checks.