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The following lists the key subject areas for this British Standards module.
Click the links to view the associated British Standards for each area.
Couplings , Road vehicle engineering ( Module 27 )

BS 7961:2004Specification for a device for measuring the static vertical mass (noseweight)at the coupling point of the towed vehicle
BS AU 113c:1978Specification for dimensional characteristics of coupling ball for caravans and light trailers
BS AU 114b:1979Specification for strength requirements of towing brackets and coupling balls for caravans and light trailers
BS AU 138a:1980Specification for dimensions of 'contact' type couplings for air pressure braking systems on trailers and semi-trailers and their towing vehicles, and the arrangement of these couplings on articulated and drawbar combinations
BS AU 138b:2000Towing vehicle, trailer and semi-trailer pneumatic braking systems. ""Contact"" type couplings
BS AU 146b:1970Specification for standard automatic roller-type coupling for semi-trailers not exceeding 7 1/4 tons laden weight
BS AU 166:1977* ISO 3584-1975Specification for road vehicles - mounting of mechanical coupling devices on rear cross members of trucks
BS AU 187:1983Specification for tow rope assemblies for towing passenger cars and light vans
BS AU 187:2000Tow rope assemblies for towing passenger cars and light vans
BS AU 188:1983* ISO 5422-1982Specification for anchorages for towing ropes, cables or bars for road vehicles
BS AU 190:1983Specification for interface dimensions and fixing bolts for the mounting of overrun devices on delta shaped drawbars of trailers up to 2000 kg
BS AU 1c:1989* ISO 337-1981Specification for dimensions of '50' fifth wheel king pin for semi-trailers
BS AU 210-2:1994Drawbars for caravans and light trailers. Specification for the design of aluminium drawbars and chassis
BS AU 219:1988* ISO 8755:1986Specification for dimensions of 40 mm drawbar couplings between commercial road vehicles and trailers
BS AU 220:1988* ISO 1102:1986Specification for dimensions of 50 mm drawbar couplings between commercial road vehicles and trailers
BS AU 235-1:1989* ISO 8717:1988Fifth wheel couplings for commercial vehicles. Specification for test conditions and strength requirements
BS AU 235-2:1991* ISO 8716:1988Fifth wheel couplings for commercial vehicles. Method of testing strength of coupling pins
BS AU 239:1991* ISO 8718:1988Method of testing strength of drawbar couplings and eyes for hinged drawbars
BS AU 241:1991* ISO 1726:1989Specification for mechanical coupling between tractors and semi-trailers: interchangeability
BS AU 245:1992* ISO 8035:1991Specification for front towing attachments for commercial road vehicles and buses over 3.5 t
BS AU 24a:1989Specification for towing connections for trailers up to 5000 kg gross mass
BS AU 253:1993* ISO 11406:1993Specification for interchangeability of mechanical coupling between towing vehicles with rear-mounted couplings and drawbar trailers
BS AU 25:1964Specification for towing hook for use between trailers of 5-14 tons gross weight and towing vehicle
BS AU 267:1998Code of practice for breakaway cables and secondary couplings
BS AU 268:2003Passenger cars and light vans. Commercial towing pole assemblies. Specification
BS AU 26:1964Specification for towing jaw for use between trailers of 5-16 tons gross weight and towing vehicle
BS AU 27:1964Specification for towing hook for use between trailers of 5-35 tons gross weight and towing vehicle
BS AU 28:1964Specification for towing jaw for use between trailers of 5-35 tons gross weight and towing vehicle
BS AU 29:1964Specification for drawbar eyes and forecarriage pins for connection between trailers of 5-35 tons gross weight and towing vehicle
BS AU 2a:1970Specification for dimensions of 3 1/2 - 4 1/2 in diameter fifth wheel king pin for use with extra heavy duty semi-trailers
BS AU 30b:1970Specification for standard automatic roller-type coupling for semi-trailers of 7 tons to 14 3/4 tons laden weight
BS AU 3:1970Specification for clearance dimensions and fifth wheel positions for tractors and semi-trailers
BS AU 5:1963Specification for dimensions of a 'contact' type coupling for vacuum and pressure braking systems on trailers and semi-trailers
BS ISO 1103:2007Road vehicles. Coupling balls for caravans and light trailers. Dimensions
BS ISO 1726-2:2007Road vehicles. Mechanical couplings between tractors and semi-trailers. Interchangeability between low-coupling tractors and high-volume semi-trailers
BS ISO 18207:2006Road vehicles. Trailers up to 3,5 t. Control of welded towing brackets for coupling ball after fatigue testing
BS ISO 3842:2006Road vehicles. Fifth wheels. Interchangeability
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