What are Indian Standard (IS) Fasteners?
Indian Standards (IS) are detailed technical standards that are created and published by the Bureau of Indian Standards (BIS) in order to control the quality, size, materials, and performance of industrial products produced and used in India. These standards in the fastener sector are used in the domestic engineering works in areas that are vital like railways, power transmission, infrastructure, and heavy engineering.
Manufacturers follow defined IS fastener specifications, ensuring that Indian Standard bolts and nuts achieve consistent dimensional accuracy, controlled thread profiles, reliable material integrity, and verified mechanical properties. This adherence guarantees that bolts, nuts, and screws meet India’s stringent safety, reliability, and durability requirements across demanding engineering environments.
Indian Standard fasteners are manufactured strictly in accordance with published IS standards and IS specifications, which establish precise requirements for IS bolts dimensions, IS nuts specifications, tolerances, mechanical properties, and application suitability. These standardized practices promote interchangeability of components and consistency throughout India’s construction and manufacturing industries, helping maintain structural integrity and long-term performance in large-scale infrastructure projects.
In contrast to pure international systems, the IS fastener standards are specifically designed to meet the Indian regulatory needs, the local weather conditions, and the local industry. Although they serve as the main standard authority in the Indian market, IS requirements are often used in conjunction with ASTM, ISO or DIN standards in the multi-faceted projects to provide a compromise between local regulatory requirements and international engineering standards.
Indian Standard Fastener Specifications
Indian Standards cover a comprehensive range of fasteners, including bolts, nuts, studs, screws, and washers, used in structural, mechanical, and industrial applications across India.
| IS Standard | Fastener Type | Description / Application |
|---|---|---|
| IS 1363-1 | Hexagon Head Bolts | Hex head bolts from M5 to M64. |
| IS 1363-2 | Hexagon Head Screws | Hex head screws from M5 to M64. |
| IS 1363-3 | Hexagon Nuts | Hex nuts from M5 to M64. |
| IS 1364-1 | Hexagon Head Bolts | Hex head bolts from M1.6 to M64. |
| IS 1364-2 | Hexagon Head Screws | Hex head screws from M1.6 to M64. |
| IS 1364-3 | Hexagon Nuts (Style 1) | Style 1 hex nuts from M1.6 to M64. |
| IS 1364-4 | Hexagon Thin Nuts | Thin hex nuts from M1.6 to M64. |
| IS 1364-5 | Hexagon Thin Nuts | Thin hex nuts from M1.6 to M10. |
| IS 1364-6 | Hexagon Nuts (Style 2) | Style 2 hex nuts from M5 to M36. |
| IS 1862 | Double End Studs | Studs threaded at both ends for industrial assemblies. |
| IS 2016 | Plain Washers | Flat washers for general fastening applications. |
| IS 2269 | Socket Head Cap Screws | Hexagon socket head cap screws from M1.6 to M64. |
| IS 6639 | Structural Hex Bolts | Hex bolts for steel structures. |
| IS 6735 | Spring Lock Washers | Spring washers for cylindrical head screws. |
| IS 6760 | Wood Screws | Slotted countersunk head wood screws. |
| IS 12427 | Transmission Tower Bolts | Hex head bolts for transmission towers (M12 to M24). |
| IS 13178 | Clamping Studs | Clamping studs for machine tools. |
| IS 2048 | Parallel Keys | Parallel keys and keyways. |
| IS 6623 | Structural Nuts | High-strength structural nuts. |
| IS 2585 | Square Head Bolts & Nuts | Square bolts, screws, and nuts (Product Grade C). |
| IS 6649 | Hardened Washers | Hardened & tempered washers for structural bolting. |
| IS 6761 | Countersunk Socket Screws | Hex socket countersunk head screws. |
| IS 6094-1 | Set Screws (Flat Point) | Hexagon set screws with flat point (M1.6 to M24). |
| IS 6094-2 | Set Screws (Cone Point) | Hexagon set screws with cone point (M1.6 to M24). |
| IS 6094-3 | Set Screws (Dog Point) | Hexagon set screws with dog point (M1.6 to M24). |
| IS 6094-4 | Set Screws (Cup Point) | Hexagon set screws with cup point (M1.6 to M24). |
| IS 15628 | Slotted Set Screws (Flat) | Slotted set screws with flat point (M1.2 to M12). |
| IS 15629 | Slotted Set Screws (Cone) | Slotted set screws with cone point (M1.2 to M12). |
| IS 15630 | Slotted Set Screws (Dog) | Slotted set screws with long dog point (M1.6 to M12). |
| IS 15631 | Slotted Set Screws (Cup) | Slotted set screws with cup point (M1.6 to M12). |
| IS 8856 | Weld Nuts | Hexagon weld nuts from M3 to M16. |
| IS 5624 | Foundation Bolts | Various foundation bolts from M8 to M72. |
| IS 5370 | Large Diameter Washers | Large diameter plain washers. |
| IS 3063 | Spring Washers | Spring washers from M2 to M100. |
| IS 7795 | Collar Nuts | Hex nuts with collar from M8 to M36. |
| IS 15581 | Flange Nuts | Hex flange nuts from M5 to M20. |
| IS 1365 | Countersunk Screws | Slotted countersunk flat head screws (M1.6 to M10). |
| IS 7169 | Self-Tapping Screws | Oval head self-tapping screws. |
| IS 7170 | Self-Tapping Screws | Flat head self-tapping screws. |
| IS 7173 | Self-Tapping Screws | Pan head self-tapping screws. |
These Indian Standard fasteners are extensively used in government projects, infrastructure development, power plants, railways, and heavy engineering industries.
IS Standards vs International Fastener Standards
While IS fastener specifications are governed regionally, they are frequently aligned with global standards to ensure compatibility in large-scale engineering projects.
| Aspect | IS (Indian Standard) | ASTM / ISO / DIN |
|---|---|---|
| Governing Body | Bureau of Indian Standards (BIS) | International bodies |
| Primary Focus | Regulatory compliance & dimensions | Global dimensions & materials |
| Usage Region | India | Worldwide |
| Used Together | Yes | Yes |
In practice, fasteners may conform to IS bolts dimensions and IS nuts specifications while being manufactured using ASTM or ISO material grades, particularly for EPC, refinery, and export-oriented projects.
Applications of Indian Standard Fasteners
Indian Standard Fasteners are commonly specified in:
- Government and public sector projects
- Infrastructure and construction
- Power generation plants
- Railways and transportation
- Heavy engineering and fabrication
Indian Standard Fasteners Supplied by Jade Alloys
Jade Alloys is a trusted manufacturer and supplier of IS compliant fasteners, catering to the specific technical and regulatory needs of the Indian industrial sector.
Our Capabilities Include:
- Manufacturing strictly as per IS 1363, IS 1364, and IS 3757
- Availability in multiple property classes such as 4.6, 5.6, 8.8, and 10.9
- Complete traceability with BIS-aligned Material Test Certificates (MTC)
- Surface finishes including Hot Dip Galvanized, Zinc Plated, and Blackened
- Specialized expertise in high strength structural bolts for bridges, power plants, and skyscraper construction
