... ) Thickness: 0.4-0.7mm 3)Width:4-8mm Starter spring/Springs for starter assy of engines1) Material: 62Si2MnA2) Thickness: ... for Industrial machine,(ie. garden hose reels, balancer, Retractable Dog Leash, Ink Liner, Measuring Tape,meters and toys, cars safety belts ... diesel oil , electrical machine ,start-up machine,etc.),constant force spring for door ,windows ,electric fans ,machines of lift and down ...