Gripped / Anchor type (1100 series which conform to BS 3974 Part 1: 1974 Fig 11A ) are used where it is necessary to hold the pipe in all directions.
Non-Gripped / Guide type (1101 series which conform to BS 3974 Part 1: 1974 Fig 10A ) are used where it is undesirable to restrict longitudinal movement
The extended leg range (1103 series - As C&P Fig 283) are designed around Iron & Steel Schedule pipe sizes. They are classed as a non-grip / guide U-bolt.
Light Pattern U-bolts (1102 Series - as C&P Fig 222) are designed around Iron & Steel Schedule pipe sizes and are a Gripped (Anchor style) used for lighter applications
DIN 3570 in all materials and sizes also available