Maximum Post Centres The maximum post centres for handrailing are calculated based on the maximum allowable bending moment of the tube for each load case. The maximum centres in mm are shown in the table below: Tube Size> 33.7 x 3.2 42.4 x 3.2 42.4 x 4 48.3 x 3.2 48.3 x 4 48.3 x 5 50D 900mm High Handrail Design Load Maximum Post Centres in mm 360n/m 1189 1994 2356 2667 3167 4646 740n/m 578 970 1146 1297 1541 2260 1500n/m 285 479 565 640 760 1115 1000mm High Handrail Design Load Maximum Post Centres in mm 360n/m 1070 1795 2120 2400 2850 4181 740n/m 521 873 1031 1168 1886 2034 1500n/m 257 431 509 576 684 1004 1100mm High Handrail Design Load Maximum Post Centres in mm 360n/m 973 1632 1927 2182 2591 3801 740n/m 473 794 938 1061 1260 1849 1500n/m 233 392 463 524 622 912 1250mm High Handrail Design Load Maximum Post Centres in mm 360n/m 856 1436 1696 1920 2280 3345 740n/m 416 699 825 934 1109 1627 1500n/m 205 345 407 461 547 803 Table 3