Our British Standard U-bolts conform to BS 3974 Part 1 and are available as Gripped (Anchor) or Non-Gripped (Guide). Typically stocked in Bright Zinc Plated mild steel (BZP), T304 & T316 stainless steels, though other materials are available on request Gripped type (1100 series) are used where it is necessary to hold the pipe in all directions Non-Gripped type (1101 series) are used where it is undesirable to restrict longitudinal movement