ISMC 300 Weight, Dimensions and IS 808 Properties

By MetalWeightPro Team · Updated May 2026

ISMC 300 heavy steel channels stacked in fabrication yard showing 300 mm web depth and wide 90 mm flanges — ISMC 300 — 300 × 90 mm C-section, 36.3 kg/m, manufactured to IS 808:1989. Used as primary crane runway girders and heavy back-to-back column assemblies in industrial plants.

ISMC 300 weighs 36.3 kg per metre as per IS 808:1989.

One 6-metre length weighs 217.8 kg · one 12-metre length weighs 435.6 kg
Web height 300 mm · flange width 90 mm · web thickness 7.8 mm
Cross-sectional area 46.30 cm² · I_xx = 8079.1 cm⁴

ISMC 300 is a heavy structural channel in IS 808:1989. At 36.3 kg/m with a 300 mm web and 90 mm flange, it is one of the largest standard channels stocked in India and is used for primary beams, heavy crane runway girders, and large back-to-back column assemblies.

ISMC 300 Weight Calculator

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ISMC 300 — Weight Calculator

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IS 808:1989 Dimensions and Sectional Properties

Property	Symbol	Unit	Value
Web height	h	mm	300
Flange width	b	mm	90
Web thickness	t_w	mm	7.8
Flange thickness	t_f	mm	13.6
Cross-sectional area	A	cm²	46.30
Mass per metre	—	kg/m	36.3
Moment of inertia (x–x)	I_xx	cm⁴	8079.1
Moment of inertia (y–y)	I_yy	cm⁴	214.7
Elastic section modulus (x–x)	Z_xx	cm³	538.6
Elastic section modulus (y–y)	Z_yy	cm³	32.2
Radius of gyration (x–x)	r_xx	cm	13.2
Radius of gyration (y–y)	r_yy	cm	2.15

Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.

ISMC 300 cross-section diagram showing web height 300 mm, flange width 90 mm, web thickness 7.8 mm per IS 808:1989 — ISMC 300 cross-section dimensions per IS 808:1989. h = 300 mm · b = 90 mm · t_w = 7.8 mm · t_f = 13.6 mm.

Common Applications of ISMC 300

ISMC 300 is used for primary floor beams in heavy industrial mezzanines, EOT crane runway girders for 10–20 tonne capacity cranes, back-to-back column pairs in heavy prefabricated structures, and transfer beams over large openings. SAIL Bhilai, JSW Steel, and Tata Steel produce ISMC 300 in IS 2062 E250 and E300 grade. Verify stock availability — not all distributors carry ISMC 300 as regular stock.

Worked Example

A plant engineer in Vadodara needs 8 runway girder channels of ISMC 300, each 9 m long, for a 15-tonne EOT crane bay. Total length = 8 × 9 = 72 m. Weight = 72 × 36.3 = 2,613.6 kg (2.614 tonnes). At a market rate of ₹59,000 per tonne (Vadodara, May 2026), the material cost is approximately ₹1,54,200 before drilling and installation.

Related ISMC Sections

Compare with adjacent sizes: ISMC 250 (30.6 kg/m) · ISMC 350 (43.2 kg/m). For all ISMC sizes see the Section Reference Library →

Frequently Asked Questions

What is the weight of ISMC 300 per metre?

ISMC 300 weighs 36.3 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 217.8 kg. For a 12-metre length, total weight is 435.6 kg.

ISMC 300 ka weight per meter kitna hota hai?

IS 808:1989 standard ke according, ISMC 300 ka weight 36.3 kg/m hota hai. 6 metre ki ek length ka total weight 217.8 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.

What are the dimensions of ISMC 300?

ISMC 300 per IS 808:1989 has a web height of 300 mm, flange width of 90 mm, web thickness of 7.8 mm, and flange thickness of 13.6 mm. The cross-sectional area is 46.30 cm².

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