This Standard specifies requirements for 50 mm, 75 mm and 90 mm kingpins for use in articulated vehicles, B-doubles and road trains, in normal use on both sealed and unsealed roads.Requirements covering mechanical properties, dimensional standards for interchangeability and dynamic testing are provided in Appendix A.The determination of dynamic strength using finite element analysis is given in Appendix B.NOTES:1 Recommendations and requirements for fifth wheel assemblies on prime movers are given in AS/NZS 4968.2.2 Guidelines for the attachment of kingpin to skid plate are given in Appendix C.3 The method of calculation of D-values is given in AS/NZS 4968.1.

First published as part of AS D14-1968.AS D15 first published 1968.AS 1771 first published 1975.AS 1772 first published 1975.AS 1773 first published 1975.AS D14-1968 revised and redesignated as AS 2175.1-1978.AS D15-1968 revised and redesignated as AS 2175.2-1978.Second edition AS 1771-1987.AS 1772-1975 and AS 1773-1975 revised, amalgamated and redesignated as AS 1773-1990.AS 2175.1-1978 and AS 2175.2-1978 revised, amalgamated and redesignated as AS 2175-1990.AS 4235 first published 1994.Second edition AS 2175-1995.Third edition AS 1773-1996.Third edition AS 1771-1996.AS 2175 Supplement 1 first published 2002.AS 1771-1996, AS 1773-1996, AS 2175-1995, AS 2175 Supplement 1-2002 and AS 4235-1994 jointly revised, amalgamated and redesignated in part as AS 4968.2:2003.Second edition 2011. Originated as part of ASD14-1968, ASD15-1968, AS1771-1975, AS1772-1975, AS1773-1975, AS2175 Supplement 1-2002 and AS4235-1994. Previous editions AS1771-1996, AS1773-1996, AS2175-1995, AS2175 Supplement 1-2002 and AS4235-1994. AS1771-1996, AS1773-1996, AS2175-1995, AS2175 Supplement 1-2002 and AS4235-1994 jointly revised, amalgamated and redesignated in part as AS/NZS4968.3:2003. Second edition 2011.