Series 51, Energy chain® with crossbars every second link. 1.KMA-mounting brackets 2. Mounting brackets, available: locking/pivoting 3. R98:Swivelable and removable lid 4.R98: Removable bottom lids 5.Combinable tube and chain 6.Integratable strain relief 7. 50/51:Removable crossbars on both sides Inner widths Bi: 1.97 up to 23.62 (50 - 600 mm) Bending radii R: 5.91 up to 39.37 (150 - 1000 mm) Pitch: 3.58 (91 mm) per link = 4 links/ft (11/m) When to use Series 51 If a simple system proven over many years is required When not to use Series 51 When large unsupported lengths are required in "side-mounted" applications Series 5150 If a simpler and more economical solution is desired Series 151