What is the standard thickness for a mild steel rolling shutter slat (lath)?

For shutters up to 3.5m wide, the minimum thickness is 0.90 mm (20 SWG). For widths between 3.5m and 7.5m, it is 1.25 mm (18 SWG) as per Table 1.

What is the minimum thickness for the guide channels?

The guide channels for mild steel shutters must have a minimum thickness of 3.15 mm as per Clause 5.4.1 and Table 1.

What are the painting requirements for mild steel shutters?

All mild steel parts, unless galvanized, must be cleaned and applied with at least one coat of red oxide zinc chromate primer conforming to IS 2074 (Clause 8.1).

Does this standard cover gear-operated shutters?

Yes, it covers both manually operated (push-pull and mechanical winding handle) and gear-operated shutters (Clause 5.7).

IS 6248

: 1979

Metal Rolling Shutters and Rolling Grills

CurrentFrequently UsedSpecificationBIMArchitectural · Doors, Windows and Shutter

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This standard specifies the requirements for materials, dimensions, construction, and finish of metal rolling shutters and rolling grills. It applies to both manually and mechanically operated shutters and grills used for closing external and internal openings in buildings.

Metal Rolling Shutters and Rolling Grills

Quick Reference Values

Minimum thickness of MS slats (up to 3.5m width)0.90 mm

Minimum thickness of MS slats (over 3.5m to 7.5m width)1.25 mm

Minimum thickness of MS guide channels3.15 mm

Minimum thickness of hood cover (up to 3.5m width)0.80 mm

Minimum depth of guide channel engagement for slats40 mm

Minimum weight of MS helical springs8 kg/m

Practical Notes

Ensure guide channels are adequately embedded in the masonry or concrete structure (typically min. 75mm) for security and stability.

For exterior shutters, specifying weather strips at the top, bottom, and guides significantly improves protection against rain and dust.

Regular maintenance, especially lubrication of the springs and guide rails, is critical for smooth operation and preventing jamming or failure.