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1.Our Product follow the standard:ISO74652.We has passed ISO9001:20003.We also can process non-standard products with the references to the customer' requirementsDimensions of Hollow Guide Railb1cfh1h2kmr1a±1+0.20-0.15+0-0.50±0.40+60+20TK375255±0.210±0.2205900TK587≥1.836016.4253TOLERANCES±1+0.20-0.15±0.3±1±0.2+60+20TK3A782.2601016.43900TK5A3.225Physical Properities of Hollow Guide RailSq1elXXWXXiXXlYYWYYiYYCm2Kg/mcmCm4Cm3cmCm4Cm3CmTK33.482.741.8611.89.271.856.471.731.36TK55.864.602.1526.906.992.0818.614.281.73TK3A4.363.402.1818.094.742.0413.623.491.77TK5A6.174.852.1424.336.301.9918.784.821.74Chemical Composition and Mechnical Property of Guide Rail Steel CODES/STANDARDSRail Compositions %(N/mm2 or MPa)(%)CSiMnPSYield StressTensile StrengthElongationISO 630<0.21<0.4<1.5<0.045<0.045>275410~540>22YB/T 157-1999Q235A0.14~0.22<0.30.30~0.65<0.045<0.050>235375~460>26YB/T 157-1999Q255A0.18~0.28<0.3