BS AU 50 is a British Standard on tyres and wheels for commercial vehicles. The main aim of the BS AU 50 series is to provide the best industry guidance on the specification of vehicle wheels and rim maintenance and repair of heavy commercial vehicles.
BS AU 50-2.3 is the third section of the second part of the BS AU 50 series that specifies dimensions and performance requirements for a range of sizes of wheel and hub nuts, bolts, and studs for road vehicles.
The range of sizes covered is normally used on heavy commercial vehicles, but if used on other types of vehicles the requirements of BS AU 50-2.3 are still applicable.
BS AU 50-2.3 is applicable to fasteners for spigot-located wheels employing 18 mm, 20 mm, 22 mm, and 24 mm studs with hexagonal nuts fitted with flat-seating, captive washers (type A mounting), cone-fixings of 18 mm, 7/8 in British Standard Fine (BSF), and 1 in BSF sizes (type B mounting), and spherical-faced nuts for 18 mm, 20 mm and 22 mm sizes.
Note: BS AU 50-2.3 does not cover back-nuts that are used to secure certain types of stud to wheel hubs but it does cover that part of the stud on which the back-nut fits.
BS AU 50-2.3 on the specification for road-wheel nuts, studs, and bolts is useful for:
The rim supports and seals the tyre to the wheel ensuring the proper fitting between tyre and rim and retaining the air inside the tubeless tyre. The wheel bolts, nuts or studs as specified by the vehicle manufacturer must be fitted on the same wheel/tyre assembly. All bolts, nuts or studs must be in place. Road-wheel nuts, studs, and bolts for commercial vehicles are required to hold the wheels ensuring the safety of the vehicle while driving.
The dimensions, proof-test, and performance test for road-wheel nuts, studs, and bolts for commercial vehicles are specified in BS AU 50-2.3.
The surface condition of nuts and captive washers, bolts and studs, captive washers for spigot-type wheel nuts, forming of bolts and studs, coatings and surface treatments, and thread form and quality are all covered by BS AU 50-2.3.
BS AU 50-2.3 specifies the information and requirements that must be agreed upon and documented between contracting parties, as well as the marking and identification of the products.
As a result, if you are a manufacturer of tyres and wheels, complying with BS AU 50-2.3 can help you demonstrate the performance and quality of your products such that they fit for its intended use ensuring the safety of road vehicles. Thus, a quality set of wheels and rims will enhance the performance and give a smoother ride.
ISO 7575