Size charts, dimensions and weights

Grade A and Grade B. Wall thickness runs to 12 mm, the ceiling the mill rolls to — sizes marked † exceed it and are supplied against order. Schedule 10, 20 and 80 are on the next page.

Wall thicknesses follow ASME B36.10M; Schedule 10 below 14" takes the B36.19M 10S walls, and Schedule 20 is defined from 8" upward. Walls marked † exceed the 12 mm mill ceiling and are supplied against order. Weights are plain-end, calculated at 7.85 g/cm³.

Mass calculated with an outer corner radius of 1.5 × wall at 7.85 g/cm³. A dash means that wall is not rolled in that size. Bundle counts not shown are confirmed at order. Inch trade sizes sold by gauge are in the trade weight chart, section 03.

Same basis as the square chart. Sizes are quoted depth × width; other combinations are rolled to order. A dash means that wall is not rolled in that size.

Outside diameter is the nominal size; BS 4568 holds it to ±0.3 mm and IS 9537 applies a minus-only tolerance. BS 4568 conduit is supplied in 3.75 m lengths threaded to ISO metric form at both ends. Class 4 is the same size range hot-dip galvanized rather than pre-galvanized. Weights are nominal, at 7.85 g/cm³.

Weight band in kilograms for one 20 ft (6 m) length. The square, rectangular and profile sizes on each line are rolled from the same strip as the round conduit and fall in the same band. Sizes are in inches except 19 × 42, which is the elliptical section in millimetres. Profile market names are shown in red.

One line per thickness, as published — a shape is not one product but one per gauge, and the bundle weight moves with it. A, B, C and D are section dimensions in mm.

BS EN 39 designates Type 3 (3.2 mm wall) and Type 4 (4.0 mm wall). The 3.0 mm light tube is not an EN 39 type and is supplied to the client's specification. Available in various lengths, subject to enquiry.

Galvanized iron pipe to ASTM A-53 Sch 40 also available, subject to enquiry.

Grade designations are the specified minimum yield strength in ksi. PSL 2 carries the same strength floors as PSL 1 plus tighter chemistry limits, guaranteed impact toughness and mandatory non-destructive inspection — specify which level the project requires.

Outside diameter in mm, figures in kilograms per metre. A dash means that wall is not rolled in that diameter.

Light-wall mechanical and general-engineering tube, quoted on outside diameter. Walls above 3.2 mm are quoted on enquiry.

Section size in mm, figures in kilograms per metre.

Section size in mm, figures in kilograms per metre. The 19 × 42 elliptical is also sold in the trade by the 20 ft length — see section 03.

Thickness 0.50 mm to 20 mm: cold rolled 0.50 mm to 3.00 mm, hot rolled 1.5 mm and heavier. Weights are for plain uncoated steel. Sheet weight is for a 4×8 ft (1219 × 2438 mm) sheet — pro-rata for 1250 × 2500 mm or 1500 × 3000 mm.

Weights are BASE STEEL only. Note that ASTM A653 and EN 10346 both define the ordered thickness as INCLUDING the zinc — a 0.50 mm G90 sheet carries about 0.46 mm of steel. Order to ASTM A653 Supplementary Requirement S1 if you need the thickness to mean base metal. Zinc adds its own coating mass on top: Z275 = 275 g/m² = 0.275 kg/m² across both faces.

Weights are base metal thickness (BMT), excluding zinc and paint. Total coated thickness (TCT) runs 0.04–0.09 mm above BMT once the zinc and the paint system are counted — always confirm which basis a quotation is written on.

Order on COVER width, never overall width. Cover is what one sheet actually covers once side-lapped; the difference is the lap you are paying for but not covering with. Corrugated cover assumes a two-corrugation side lap, which is what high-wind and monsoon exposure calls for — a one-corrugation lap gains about 76 mm of cover and loses weather resistance.

Gauge numbers are Standard Wire Gauge and are trade shorthand, not a tolerance — order on the millimetre. Running weights are nominal, calculated at 7.85 g/cm³; the coil is supplied to weight, so length per coil follows from the gauge.

Class A carries 550 g/m² of zinc, Class B 1000 g/m², both measured over the two surfaces. Running weights are calculated from the developed width of the section.

Panels lap one corrugation at each splice, so the effective length is shorter than the panel itself. Post spacing is set by the containment level the road authority specifies.