Standard Nominal Bore 'U' Bolts - with 2 Nuts

 MetricImperialABCD
1/2" = 15mm Pipe size (M6 metric thread)151/22148306
3/4" = 20mm Pipe size (M6 metric thread)203/42753306
1" = 25mm Pipe size (M6 metric thread)2513460306
1.1/4" = 32mm Pipe size (M10 metric thread)321.1/445704010
1.1/2" = 40mm Pipe size (M10 metric thread)401.1/251754010
2" = 50mm Pipe size (M10 metric thread)50260854010
2.1/2" = 65mm Pipe size (M10 metric thread)652.1/2761004010
3" = 80mm Pipe size (M12 metric thread)803901154012
4" = 100mm Pipe size (M12 metric thread)10041141404012
5" = 125mm Pipe size (M12 metric thread12551401654012
6" = 150mm Pipe size (M12 metric thread)15061702005012
8" = 200mm Pipe size (M16 metric thread)20082252605016
10" = 250mm Pipe size (M16 metric thread)250102773155016
12" = 300mm Pipe size (M16 metric thread)300123243605016
14" = 350mm Pipe size (M16 metric thread)350143653957516
16" = 400mm Pipe size (M16 metric thread)400164154958516
18" = 450mm Pipe size (M16 metric thread)450184655358516
20" = 500mm Pipe size (M16 metric thread)500205205958516
22" = 550mm Pipe size (M20 metric thread)550225706459020
24" = 600mm Pipe size (M20 metric thread)600246206959020