This SAE Recommended Practice establishes the mounting hardware to be used with demountable rims, wheels for demountable rims, rim spacers designed for 28 degree bevel mounting systems, and intended for use on commercial vehicles. The dimensions given are those necessary to maintain serviceability and interchangeability of mounting hardware. his document is divided into two sections. Section 1 establishes the practice for mounting hardware. Section 2 records information on current mounting hardware. Special and less common applications are not covered in this document.