The Track Link surface hardness ranges from HRC48 to 56,depth from 6mm to 12mm. The Track Pin surface hardness ranges from HRC52 to 57,depth from 3mm to 6mm. The Track Bushing surface hardness ranges from HRC50 to 55,depth from 2mm to 4mm. Brand  Applicable Model Range CATERPILLAR E70B ~~ E450, D3 ~~ D9N KOMATSU PC20 ~~ PC650, D20 ~~ D355 HITACHI EX30 ~~ EX750 DAEWOO / DOOSAN S50 ~~ S600, DH04 ~~ DH450 HYUNDAI R50 ~~ R500 KOBELCO SK04 ~~ SK450, K903 ~~ K912 MITSUBISHI MS30 ~~ MS280 SAMSUNG / VOLVO SE130 ~~ SE450, MX3 ~~ MX452, EC55 ~~ EC460 SUMITOMO SH55 ~~ SH580, LS2600 ~~ LS4300 KATO HD250 ~~ HD1430 Other Brands LIEBHERR/LR, YUCHAI/YC, LIUGONG/LG, LONGGONG/LK, ZOOMLION-JANYANG/JY, KUBOTA/JH, TAKEUCHI/TB, SUNWARD/SWE, CASE/CX, IHI/IHI, YANMAR/YM, FURUKAWA/GH, BE (1.6T ~~ 40T)