IS 4351:1976 is the Indian Standard (BIS) for steel door frames. This standard specifies the requirements for materials, dimensions, profiles, construction, and finishing of steel door frames made from plain carbon steel sheets for use in buildings.
Specifies materials, dimensions and fabrication of steel door frames for general building purposes.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Standard Sheet Thickness (General Use) | 1.25 mm | 18 gage (~1.2 mm) for Level 1 or 16 gage (~1.5 mm) for Level 2 (Heavy-Duty) | ANSI/SDI A250.8 |
| Heavy-Duty Sheet Thickness | 1.60 mm or 2.00 mm | 14 gage (~1.9 mm) for Level 3 (Extra Heavy-Duty) | ANSI/SDI A250.8 |
| Material Specification | Mild steel sheet conforming to IS 1079 | Cold-rolled steel per ASTM A1008/A1008M or Hot-dip galvanized per ASTM A653/A653M | ANSI/SDI A250.8 |
| Hinge Reinforcement Thickness | 3.15 mm plate (recommended) | 7 gage steel (~4.5 mm) | ANSI/SDI A250.8 |
| Squareness Tolerance | ± 2 mm to 3 mm on diagonal difference | ± 1/16 inch (±1.6 mm) on diagonal measurement | ANSI/SDI A250.8 |
| Overall Width Tolerance | ± 1.5 mm | ± 3/64 inch (±1.2 mm) | ANSI/SDI A250.8 |
| Primer Requirement | One coat of red oxide zinc chromate primer as per IS 2074 | Rust-inhibitive primer capable of passing a 24-hour salt spray test (ASTM B117) | ANSI/SDI A250.8 |