(1) A kingpin used in a B-double or road train must:
(a) be a 50, 75 or 90 millimetre kingpin; and
(b) have a D-value complying with Australian Standard AS 2175-1990 Articulated Vehicles–Kingpins.
(2) A 50 or 90 millimetre kingpin used in a B-double or road train must:
(a) be built to meet the dimension requirements in Australian Standard AS 2175-1990 Articulated Vehicles–Kingpins ; and
(b) not be worn away more than recommended by the standard.
(3) A 75 millimetre kingpin used in a B-double or road train must:
(a) be built to meet the dimensions in the following essential diagram; and
(b) not be worn away more than mentioned in subrule (4).
Dimensions of a 75 millimetre kingpin
(4) In testing a 75 millimetre kingpin mentioned in the essential diagram in subrule (3) to decide whether its D-value complies with subrule (1)(b):
(a) diameter F must not wear more than 3 millimetres; and
(b) diameter G must not wear more than 2 millimetres; and
(c) height H must not wear more than 2.3 millimetres.