Conduit runs off the same ERW line as the hollow section, from the same prime soft mild steel coil. What separates it is the finish and the tolerance on the bore, because conduit is pulled through rather than built into.

It is used where a tube has to carry something or hold a light load rather than take structure — cable and wiring runs, furniture frames, steel housing and general building work. The catalogue does not publish a size chart for conduit itself; standard and special sections are made to order, and the section, gauge and length are agreed at order.

The same line rolls the LTZD profiles: L, T, Z and D sections in 0.70 mm to 1.20 mm, made for fabricating doors, windows, gates and railings. They were developed for low-cost housing, where a steel frame replaces a timber one — which saves both the wood and the water that curing timber needs. They suit residential, industrial, commercial and warehouse work, and come in a range of surface finishes.

The shape code carries the nominal size, so L-40 and T-48 are separate families rather than points on one scale. Every thickness is listed on its own line below with its running weight, its bundle count and its bundle weight, along with the A, B, C and D dimensions a fabricator sets the jig to.

Applications

Electrical and cable runs
Door and window frames
Gates and railings
Low-cost and prefabricated housing
Furniture frames
Buildings, steel houses and warehouses
General fabrication

Sectors supplied

Construction
Low-cost housing
Furniture manufacture
Electrical contracting
Fabrication

Specifications

Sizes and weights

Figures as published in our catalogue. Tolerances are held to the standard named on each table.

Steel conduit — sizes and wall thickness

BS 4568-1 Class 3 and IS 9537 (Part 2)

Steel conduit — sizes and wall thickness — BS 4568-1 Class 3 and IS 9537 (Part 2)
Nominal size mm	Outside dia mm	Wall thickness (mm)		kg/m
Nominal size mm	Outside dia mm	BS 4568 Cl. 3	IS 9537 Pt 2	kg/m
16	16.0	1.40	—	0.504
20	20.0	1.60	1.40 – 1.60	0.726
25	25.0	1.60	1.40 – 1.80	0.923
32	32.0	1.60	1.40 – 1.80	1.200
40	40.0	—	1.60 – 2.20	1.515
50	50.0	—	1.60 – 2.20	1.910

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.

LTZD profiles — sections, weights and bundle counts

Manufactured under ISO 9001, ISO 14001 and ISO 45001; CE marked

LTZD profiles — sections, weights and bundle counts — Manufactured under ISO 9001, ISO 14001 and ISO 45001; CE marked
Shape	Thickness mm	Per bundle	Weight		Dimensions (mm)
Shape	Thickness mm	Per bundle	kg/m	kg/bundle	A	B	C	D
L-40	0.7	210	0.678	794	38	13	26.5	25
L-40	0.8	210	0.773	906	38	13	26.5	25
L-40	0.9	210	0.868	1017	38	13	26.5	25
L-48	0.7	143	0.818	653	48.5	13	26.5	35.5
L-55	0.7	100	0.937	523	52	15	34	37
L-55	0.8	100	1.069	597	52	15	34	37
L-55	0.9	100	1.201	670	52	15	34	37
T-48	0.7	150	0.818	685	50	13	26	24
T-48	0.8	150	0.933	781	50	13	26	24
T-48	0.9	150	1.048	877	50	13	26	24
T-60	0.7	100	1.029	574	61	15	34	31
T-60	0.8	100	1.174	655	61	15	34	31
T-60	0.9	100	1.318	735	61	15	34	31
D-60	0.7	60	1.029	356	51.5	51.7	51.7	12.7
D-60	0.9	60	1.318	456	51.5	51.7	51.7	12.7
D-60	1.2	60	1.749	604	51.5	51.7	51.7	12.7
Z-48	0.7	150	0.818	685	50	13	26.5	24
Z-48	0.8	150	0.933	781	50	13	26.5	24
Z-48	0.9	150	1.048	877	50	13	26.5	24
Z-60	0.7	100	1.029	574	61	15	34	31
Z-60	0.8	100	1.174	655	61	15	34	31
Z-60	0.9	100	1.318	735	61	15	34	31

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.

Gallery