IS 1367 Part 1 : 2002Technical Supply Conditions For Threaded Steel Fasteners - General Requirements

IS 1367 (Part 1):2002 is the introductory / general-information code for the IS 1367 series — Technical Supply Conditions for Threaded Steel Fasteners. It defines terminology, designation, marking conventions, and packaging requirements that apply across the entire 22-Part series.

Use it when: - Understanding fastener designation — how property class numbers like 8.8 / 10.9 / 12.9 are interpreted - Specifying packaging + marking requirements in procurement contracts - Cross-referencing IS designation with international fastener standards (ISO, EN, ASTM) - Reading fastener catalogues + supplier documentation — understanding the terminology

The IS 1367 series covers all aspects of threaded fastener supply from materials and properties through to surface treatments and packaging: - Part 1 (this code): General introduction, terminology - Part 2: Mechanical properties and test methods - Part 3: Hot-dip galvanized coatings (IS 1367 Part 3:2002) - Parts 4-22: Various specialized topics (zinc plating, chrome plating, passivation, special treatments, etc.)

Together with related codes: - IS 1364:2002 — Hexagon head bolts, screws and nuts (product grades A, B) - IS 1363:2002 — Hexagon head bolts (product grade C — lower precision) - IS 3757:1985 — High strength structural bolts (IS 3757:1985) - IS 4000:1992 — High strength bolting in steel structures (the design / installation code) - IS 6649:1985 — Hardened and tempered washers

The 'Property Class' number system (per ISO 898-1 + adopted in IS 1367 Part 1):

For bolts: designation like '8.8' means: - First number (8) × 100 = minimum UTS in MPa → 800 MPa - Second number (.8) × first × 100 = minimum 0.2% proof stress → 0.8 × 800 = 640 MPa - Elongation: minimum 12% on a standard tensile specimen

Common property classes and their characteristics:

| Class | Min UTS (MPa) | Min Proof / Yield (MPa) | Elongation (%) | Hardness HBW | |---|---|---|---|---| | 4.6 | 400 | 240 | 22 | 120-150 | | 4.8 | 400 | 320 | 12 | 130-160 | | 5.6 | 500 | 300 | 20 | 150-180 | | 5.8 | 500 | 400 | 8 | 160-200 | | 6.8 | 600 | 480 | 8 | 180-220 | | 8.8 | 800 | 640 | 12 | 200-300 | | 10.9 | 1000 | 900 | 9 | 320-340 | | 12.9 | 1200 | 1080 | 8 | 385-420 |

Selection guide: - Property class 4.6, 5.6, 5.8: general fastening (low stress); construction, machinery, agricultural - Property class 6.8, 8.8: structural connections, machinery components, pressure vessels at moderate temperature - Property class 10.9, 12.9: high-strength structural connections, slip-critical joints, fatigue-loaded applications, transmission tower / bridge / high-rise structural steel work

For nuts: '8' (single digit) means hardness class compatible with 8.8 bolt; '10' compatible with 10.9; '12' compatible with 12.9.

For washers: typically not graded; specify hardened and tempered per IS 6649 for HSFG (High Strength Friction Grip) applications.

Standard sizes (Clause 5): dimensions and tolerances align with ISO metric series: - M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39, M42, M45, M48 - M16-M24 are most commonly used in Indian construction

Marking on bolt head (Clause 6): - Property class number (e.g., '8.8', '10.9') — clearly stamped - Manufacturer's identification mark or trademark - Size designation (often visible as M-prefix number on a sleeve, e.g., M20) - Sometimes batch / heat number for full traceability (mandatory for high-property classes)

Marking on nut: - Property class number (e.g., '8' or '10') - Manufacturer's mark - For metric nuts, position of marking is on one of the side faces or the bottom face

Marking on washer: typically minimal — manufacturer's mark + IS reference (e.g., 'IS 6649')

Packaging (Clause 7): - Sealed containers for high-property classes (8.8+) — prevents moisture / contamination during transit + storage - Boxes or barrels labeled with size, property class, quantity, batch number, manufacturer - Test certificate enclosed for each batch — Material Test Certificate (MTC) per ISO 10474 - Storage life: 1-2 years in sealed packaging; longer for HDG-coated

Traceability requirements (Clause 8): - Each batch must have a unique heat / lot number - The heat number traces back to: - Raw material origin (steel mill + heat number) - Manufacturing process date - Heat treatment cycle (for property classes ≥ 10.9) - Quality control inspection records - For critical applications (structural steel work, pressure vessels): full chain of traceability from raw material through fastener product

MTC content typically includes: - Chemistry (per element) - Mechanical properties (UTS, yield, elongation, hardness) - Heat treatment condition (annealed / quenched-and-tempered / etc.) - Surface treatment (uncoated / HDG / zinc-plated / etc.) - Dimensional verification - Lot quantity - Manufacturing date + expiry date - Manufacturer's stamp / signature

1. Misreading the property class — '8.8' is NOT '88 MPa'. The two-digit notation means 800 MPa UTS, 640 MPa yield. Always interpret correctly when reading drawings + specifications.

2. Using non-marked fasteners — fasteners without proper property-class marking + manufacturer ID are non-compliant per IS 1367 Part 1. For critical applications, reject unmarked fasteners.

3. Mismatched property class for bolt-nut combination — a 10.9 bolt with class 8 nut transfers load through the nut threads (lower-strength part of assembly). Use compatible nut (10 or 12) for any 10.9 bolt.

4. No traceability documentation — accepting fasteners without MTC means you don't know the actual material properties. For structural / safety-critical applications, mandate MTC per batch.

5. Confusing IS 1367 designation with international (ISO / ASTM / EN) — although IS 1367 closely aligns with ISO 898-1, slight differences in test procedures, sampling, and acceptance criteria exist. For imported fasteners, verify equivalence rather than assuming.

6. Stockpiling fasteners for years — sealed packaging extends shelf life to 2-3 years for property classes 8.8+; longer for HDG. After this, hydrogen embrittlement risk + thread degradation make fasteners suspect. Rotate inventory.

7. Specifying property class without size — '12.9 bolts' without M-prefix size is ambiguous. Always specify class + M-prefix size (e.g., 'M20 × 60 mm, property class 10.9, HDG per IS 1367 Part 3').

8. Wrong torque for class — class 10.9 fasteners require higher tightening torque than class 8.8. Use property-class-appropriate torque tables; calibrated torque wrench essential.

9. Ignoring expiration / batch traceability — when a structural failure occurs, the batch + heat number is critical for forensic investigation. Sites without proper documentation cannot trace which batch was involved.

10. Buying fasteners with no BIS approval — counterfeit fasteners look identical; chemistry + properties may be very different. BIS hologram + IS 1367 stamp give some assurance; combined with manufacturer reputation is essential.

• IS 1367 Parts 2 through 22 — full series covering technical supply conditions for threaded steel fasteners
• IS 1367 Part 3:2002 — Hot-dip galvanized coatings on fasteners
• IS 1364:2002 — Hex head bolts, screws and nuts (product grades A, B)
• IS 1363:2002 — Hex head bolts (product grade C)
• IS 3757:1985 — High strength structural bolts
• IS 4000:1992 — Code of practice for high strength bolting in steel structures
• IS 6649:1985 — Hardened and tempered washers for HSFG bolts
• IS 12779:1989 — Hot-dip galvanized steel hexagonal nuts and bolts
• IS 1608 Part 1:2005 — Tensile testing (used for fastener mechanical property verification)
• IS 1500 (Parts 1-3):2019 — Hardness testing (Brinell, Vickers, Rockwell)
• IS 1499:2003 — Charpy V impact test
• IS 800:2007 — General Construction in Steel (uses fasteners per IS 1367 + IS 3757 + IS 1364)
• IS 875 (Parts 1-5) — Code of Practice for Design Loads
• ISO 898-1:2013 — Mechanical properties of fasteners (international parent for property classes)
• ASTM A325 / A490 — US standards for high-strength structural bolts
• EN 14399 — European standard for high-strength structural bolting assemblies
• JIS B 1051 — Japanese equivalent for fastener mechanical properties
• ISO 10474 — Steel and steel products — Inspection documents (MTC)

IS 1367 Part 1:2002 is 23 years old but functionally adequate. The terminology + designation framework is internationally stable (per ISO 898-1); IS 1367 Part 1 is the Indian adoption.

Indian fastener market reality: - Major manufacturers (Sundram Fasteners, Pranav Construction Systems, Lakshmi Machine Works, Punjab Fasteners): full IS 1367 series compliance, ISO certifications, export-quality. Premium pricing but consistent quality. Used by major auto OEMs (Maruti, Tata, M&M, etc.) and major structural projects. - Mid-tier manufacturers: variable. Pre-qualify with sample testing + MTC verification. - Imported fasteners (China, Korea, Italy): widely available; check property class markings; verify against IS 1367 equivalents. - Counterfeit fasteners: a real problem in Indian market. Premium-class fasteners (10.9, 12.9) are most commonly counterfeited because of higher pricing. Always procure from BIS-licensed manufacturers + verify markings.

For specifying engineers: - Always specify: 'Bolts to IS 1364:2002, property class X.X per IS 1367 Part 1:2002, with [surface treatment per applicable IS 1367 Part]' - For HSFG: 'High-strength bolts to IS 3757:1985, property class 10.9, HDG per IS 1367 Part 3:2002' - For sensitive applications: include MTC requirement explicitly in BOQ - Mandate manufacturer's BIS hologram + IS reference markings

Quality assurance recommendations: - Pre-procurement: sample test fasteners from each supplier source — verify chemistry + mechanical against MTC - At receipt: visual inspection (markings present + clear); count + size verification; storage condition check - Random sample testing: 0.5-1% of received fasteners (small sample, but catches systemic quality issues) - Critical applications: every batch must have MTC + supplier's quality system certification (typically ISO 9001 + IATF 16949 for auto / aerospace)

For consulting engineers: when reviewing project drawings + specifications, verify that fastener specifications include all required elements: - Standard (IS 1367 / IS 1364 / IS 3757) - Property class (4.6 / 8.8 / 10.9 / 12.9) - Size (M-prefix + length) - Surface treatment (uncoated / HDG / etc.) - Special markings or requirements

Fastener specification is often the weakest part of structural steel specifications — explicit details prevent confusion + ensure proper material.

Future direction: BIS sectional committee MTD 5 has been considering updates to IS 1367 to: - Formalize newer property classes (14.8, 16.8 per ISO 898-1:2009) - Add explicit anti-counterfeiting + traceability requirements - Update test methods aligned with current ISO 898-2:2012 + ISO 898-7:1992

No public draft yet.