Round head lock bolt-12.70 mm dia, grip range-19.05 mm to 25.40 mm with collar-12.70 mm dia as per rdso s indian railway standard for lock bolt & collar is/rdso -wd/0001:2022.

7/8 inch (22.22 mm) dia. zinc plated/galvanized lock bolt with collar, grip no. 28 with grip range 44.45 - 50.80 mm material and specification : rdso s spec. no. : is/rdso-wd/0001:2022.

Round head lock bolt- 15.88 mm dia, grip range- 25.40 mm to 31.75 mm with collar dia 15.88mm, conforming to rdso specification is/rdso-wd/0001:2022 .

Round head lock bolt-22.22 mm dia, grip range-31.75 mm to 38.10 mm.

22.2 mm dia lock bolt round headed and collar with of zinc plated. grip no.16

Percent bd percent u201d lock bolt with collar required grip

Lock bolt ( 22.2 mm ) dia with coller and zink plated grip range min 44.45 mm to max 50.80 mm , grip no.28.

Lock bolt ( 22.2 mm ) dia with coller and zink plated grip range min 44.45 mm to max 50.80 mm , grip no.28.

Round head lock bolt-12.70mm dia., grip range- 19.05mm to 25.40mm

Round head lock bolt-7/8 inch dia grip range-1.500 to 1.750 inch with coller-7/8 inch dia. to rdso drg. no.-wd-11036-s-01 alt-1 and wd-11036-s-02 alt-nil.