IS 1363:1984 Part 3 is the Indian Standard (BIS) for hexagon nuts, style 1 and 2, product grade a and b. This standard specifies the dimensions and technical requirements for hexagon head bolts of product grade C in the size range M5 to M36. These fasteners are widely used in general engineering and structural steelwork where high-precision tolerances are not strictly required.
Specifies requirements for hexagon nuts, style 1 and 2, of product grade A and B.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- General — Fasteners, Bolts and Anchors
- Type
- Specification
Also on InfraLens for IS 1363
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Product Grade C indicates wider manufacturing tolerances and rougher finishes compared to Grades A and B, making them economical for standard clearance holes in steel framing.
! Always specify the property class (e.g., Class 4.6) along with this IS code for procurement to ensure adequate mechanical strength.
! Part 1 specifically covers bolts (partially threaded shank). If fully threaded fasteners up to the head are required, refer to Part 2 (Screws).
Frequently referenced clauses
steelfastenerscarbon steel
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values3
Quick Reference Values
size rangeM5 to M36
product tolerance gradeGrade C
typical property class4.6 (as per IS 1367)
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Hexagon Head Bolts
Table 2 - Preferred Lengths and Thread Lengths
Key Clauses
Clause 3 - Dimensions
Clause 4 - Mechanical Properties
Clause 5 - Marking
Clause 6 - Designation
Frequently Asked Questions3
What does Product Grade C mean?+
It refers to fasteners manufactured with wider dimensional tolerances and lesser precision compared to Grades A and B, suitable for general-purpose structural connections.
What is the difference between Part 1 and Part 2 of IS 1363?+
Part 1 specifies hexagon head bolts (which have an unthreaded shank portion), whereas Part 2 specifies hexagon head screws (which are threaded all the way to the head).
Where are the mechanical properties for these bolts defined?+
The mechanical properties, such as tensile strength and yield stress, are governed by IS 1367 (Part 3).
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.