BS4568/IEC 61386 Galvanised Steel Conduit


BS4568 and EN61386 are both British standards for galvanized steel conduit. BS4568 has been widely used in Commonwealth countries since 1970. This standard is the harmonized standard of the entire EU, but many parts of the Commonwealth still use the BS4568 standard like the Middle East and Asia.

In 2004, the International Electromechanical Commission (IEC) released IEC 61386. The new standard released is the fusion of EN50086 and BS4568. Generally, the Americas do not adopt the IEC standard, but Europe, Asia, and Africa all adopt the IEC standard. At present, the requirements for threading pipes in the Middle East, the European Union, Southeast Asia, and other regions all need to meet the requirements of EN 61386.

Galvanized steel conduit has a perfect performance in

Threading test
Zinc layer testing
Stamping tests
Bending tests
Other physical and chemical tests.

Size (mm) Outside Diameter Thickness Thread Length(mm) Length
Min Max (mm) Min Max (mm)
16 mm 15.7 mm 16.0 mm 1.4±0.15 11.5 mm 13.5 mm 3750
20 mm 19.7 mm 20.0 mm 1.6±0.15 13.0 mm 15.0 mm 3750
25 mm 24.6 mm 25.0 mm 1.6±0.15 16.0 mm 18.0 mm 3750
32 mm 21.6 mm 32.0 mm 1.6±0.15 18.0 mm 20.0 mm 3750
40 mm 39.5 mm 40.0 mm 1.6±0.15 19.0 mm 22.0 mm 3750
50 mm 49.5 mm 50.0 mm 1.6±0.15 19.0 mm 22.0 mm 3750

Class 3 and Class 4
Both end: threaded both end with one end coupling and one end plastic cap


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