U-Bolt M20 x65mm Thread, 330mm Inside Diam, 390mm Inside Height Galvanised Includes two nuts per leg Conforms to British Standard 3974 PART 1: 1974 Fig 11A. Gripped U-bolt (Anchor) Use where it is necessary to grip the pipe in all directions Galvanised - A duller finish than BZP, typically 50 microns thick covering of Zinc and therefore provides much more protection suitable for many out door applications All Measurements in mm Inside Diameter : 330 Inside Height : 390 Leg Centers : 350 Leg Length : 225 Material : Galvanised Pipe Nominal Bore : 300 Suggested Pipe OD : 323.9 Thread length : 65 Thread Size : M20 Our manufacturing tolerances are + / - 1 mm) We use roll threading so the diameter of the bar is usually less than the thread size. Please ask if unsure If using your own nuts on galvanised products please ensure they are tapped oversize to allow for the galvanised layer