標準號：BS AU 2a-1970
中文標準名稱：超重型半掛車用直徑為3.5 - 4.5的第五輪大號銷釘尺寸規范
英文標準名稱：Specification for dimensions of 31/2 - 41/2 in diameter fifth wheel king pin for use with extra heavy duty semi-trailers
標準類型：T71
發布日期：1970/8/28 12:00:00
實施日期：1970/8/28 12:00:00
中國標準分類號：T71
國際標準分類號：43.040.70;43.080.10
適用范圍：This British Standard specifies dimensions for a 7/2 - 9/2 in diameter king pin for fifth wheel attachment to semi-trailers for extra heavy duty. . A fifth wheel king pin for attachment to semi-trailers for normal and heavy duty is covered in BS AU 1, 'Dimensions of 2 - 23/8 in diameter fifth wheel king pin for use with semi-trailers'. The clearance dimensions and fifth wheel positions are given in BS AU 3, 'Clearance dimensions and fifth wheel positions for tractors and semi-trailers'. NOTE 2. The values specified in imperial units are to be regarded as the standard.