Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 1775:1993 is the Indian Standard (BIS) for steel for high strength structural fasteners. This standard prescribes the requirements for steel used in the manufacture of high-strength structural fasteners, including bolts, nuts, and washers. It specifies the chemical composition, heat treatment, and mechanical properties necessary to ensure reliability in critical slip-resistant and dynamic structural connections.
Specifies the requirements for steel used for the manufacture of high strength structural fasteners.
ISO 898-1:2013ISO (International Organization for Standardization)
HighCurrent
Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
Specifies mechanical and physical properties for bolts/screws/studs, directly corresponding to IS property classes 8.8 and 10.9.
ASTM F3125/F3125M-22ASTM International (USA)
MediumCurrent
Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch and Metric Dimensions, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength
Covers high-strength structural bolt assemblies for the same application, but uses a different grading system (e.g., Grade A325, A490).
EN 14399-1:2015CEN (European Committee for Standardization)
HighCurrent
High-strength structural bolting assemblies for preloading - Part 1: General requirements
Covers the general requirements for high-strength structural bolting assemblies, using the same property classes (8.8, 10.9) as IS.
JIS B 1051:2015JSA (Japanese Standards Association)
HighCurrent
Mechanical properties of fasteners made of carbon steel and alloy steel
Japanese standard specifying mechanical properties of fasteners, harmonized with ISO 898-1 and using the same property classes.
Key Differences
≠IS 1775 is a material standard specifying the steel for making fasteners, whereas ISO 898-1 and EN 14399 are product standards specifying the properties of the finished fastener.
≠IS 1775 allows for higher maximum phosphorus (0.040%) and sulphur (0.040%) content compared to ISO 898-1, which specifies a maximum of 0.025% for both, indicating a stricter requirement for purity in the international standard.
≠The grading nomenclature differs from US standards. IS 1775 uses grades like '8S' and '10S' (to produce 8.8 and 10.9 class bolts), while the equivalent US standard ASTM F3125 uses grades like 'A325' and 'A490', which have different chemical and mechanical property definitions.
≠ISO 898-1 and EN 14399 are part of a comprehensive series of standards covering bolts, nuts, washers, testing, and assembly, whereas IS 1775 is a standalone document focused on the steel input material.
Key Similarities
≈All standards are fundamentally based on a property class system (e.g., 8.8, 10.9) where the first number indicates nominal tensile strength in hundreds of MPa and the second number indicates the yield-to-tensile strength ratio.
≈The primary application for materials and fasteners specified in all these standards is for high-strength structural connections in steel construction.
≈IS 1775, ISO 898-1, and EN 14399 all require that the steel be heat-treated (quenched and tempered) to achieve the specified high-strength mechanical properties.
≈The core mechanical properties used to define performance—tensile strength, yield strength, elongation, and hardness—are central to all the compared standards.
Parameter Comparison
Parameter
IS Value
International
Source
Tensile Strength (Nominal), Grade 8.8 / 8S
800 MPa
800 MPa
ISO 898-1:2013
Tensile Strength (Minimum), Grade 10.9 / 10S
1000 MPa (This is the property of steel as per IS 1775, to make 10.9 bolts)
1040 MPa (For finished bolts)
ISO 898-1:2013
Yield to Tensile Ratio, Grade 8.8 / 8S
0.8 (implied)
0.8 (nominal)
ISO 898-1:2013
Yield Strength (Minimum), Grade 10.9 / 10S
830 MPa (This is the property of steel as per IS 1775, to make 10.9 bolts)
940 MPa (For finished bolts)
ISO 898-1:2013
Carbon (C) Content %, Grade 10S/10.9
0.28 - 0.55
0.25 - 0.55
ISO 898-1:2013
Phosphorus (P) Content %, max
0.040
0.025
ISO 898-1:2013
Sulphur (S) Content %, max
0.040
0.025
ISO 898-1:2013
Vickers Hardness (HV), Grade 8.8
250-320 (For finished bolt as per IS 1367)
255-335
ISO 898-1:2013
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Max Sulphur content0.040 %
Max Phosphorus content0.040 %
Minimum Tensile Strength (Property Class 8.8)800 MPa
Minimum Yield Stress (Property Class 8.8)640 MPa
Minimum Tensile Strength (Property Class 10.9)1040 MPa