IS 1161 Structural Pipe Weight Chart — YST 210, 240, 310 and 355

IS 1161 pipe weight chart data tells you the outside diameter, wall thickness, and weight per metre for every standard NB size of structural steel tube. Structural pipe ka weight differs from plumbing pipe weight because IS:1161 specifies thicker walls and higher-strength grades than IS:1239 — a distinction that matters for load calculations, cost estimates, and procurement.

IS:1161 vs IS:1239 — Why the Difference Matters

IS:1239 covers steel tubes for water, gas, and steam supply — what most fabricators call plumbing pipe or GI pipe. IS:1161:2014 covers steel tubes for structural purposes — columns, handrails, roof purlins, bracings, and trusses. The two standards share the same NB sizing system and similar OD values, but differ on three points that directly affect your weight calculation and structural adequacy.

IS:1161 ke anusar YST 310 grade structural columns aur handrails ke liye use hota hai. For hydraulic or gas service, always use IS:1239 — IS:1161 tubes are not hydraulic pressure tested.

IS:1161 YST Grade Properties

The four grades in IS:1161:2014 are differentiated by yield strength, tensile strength, and elongation. The OD and wall thickness dimensions are the same across all four grades for any given NB size — the grade affects the steel chemistry and mechanical properties, not the physical dimensions.

Mechanical properties as per IS:1161:2014 Table 2 (Fourth Revision). All four grades share identical OD and wall thickness dimensions for each NB size — grade selection affects strength, not section geometry.

IS:1161 Pipe Weight Chart — All NB Sizes

The following table gives the complete IS:1161 weight chart from 15 NB to 150 NB. The weight per metre value applies to all four YST grades for a given NB size — since dimensions are identical across grades, only the steel chemistry differs.

Outside diameter and wall thickness as per IS:1161:2014 Table 1 (Fourth Revision). Mass tolerance: ±7.5% for individual pieces, ±5% for consignments of 10 tonnes or more, as per IS:1161 Clause 10. Weight calculated using formula: (OD − WT) × WT × 0.02466. Verify with mill test certificate before use in structural design.

Weight Formula for IS:1161 Structural Tubes

The same formula used for all circular steel tubes applies to IS:1161 sections:

Weight (kg/m) = (OD − WT) × WT × 0.02466

OD

Outside diameter of tube, in millimetres — as per IS:1161:2014 Table 1 for the specified NB size

WT

Wall thickness, in millimetres — as per IS:1161:2014 Table 1

0.02466

SI constant = π × 7850 / (4 × 1,000,000) — derived from steel density 7850 kg/m³; constant for all YST grades

Use our free Metal Weight Calculator to verify weight for any pipe size and material — enter OD, WT, and length to get an instant result.

Worked Example — 40 NB IS:1161 YST 310 Handrail

A structural fabricator in Ahmedabad is pricing a handrail system for an industrial mezzanine. The specification calls for 40 NB IS:1161 YST 310 tube throughout. The handrail run totals 24 linear metres. He needs the total tube weight to price the job and raise a material purchase order.

Step 1 — Read OD and WT from IS:1161 table:
40 NB IS:1161: OD = 48.3 mm, WT = 3.2 mm

Step 2 — Verify weight per metre using formula:
(48.3 − 3.2) × 3.2 × 0.02466
= 45.1 × 3.2 × 0.02466
= 144.32 × 0.02466
= 3.56 kg/m — confirms the IS:1161 table value exactly

Step 3 — Calculate total weight for 24 metres:
3.56 kg/m × 24 m = 85.4 kg

Step 4 — Apply ±7.5% tolerance for procurement buffer:
At the high end: 85.4 × 1.075 = 91.8 kg. Order 100 kg to account for site cuts and end waste — approximately 17 lengths of 6-metre random stock at 3.56 × 6 = 21.4 kg per length.

For a comparison with IS:1239 Class B pipe at the same 40 NB size (OD 48.3 mm, WT 3.2 mm — identical dimensions, different standard), see the IS 1239 pipe weight chart. Also see the MS pipe weight per metre guide for a broader pipe weight reference across all classes.