supply of set of bolster springsset of bolster springs, set of bolster springs for 8 wheeler tower car of beml make. 1 ) . helical spring ou ter wire dia=36mm, l=4593mm conforming to 52cr4mo2v to is:3195-92, 415 to 460bhn after hardenin g and tempering & to rdso specification wd-01-hls-94 ( rev.-4 ) and to beml drawing no.901-82029, it em-01, alt.-4, qty.- 01 no. / set. 2 ) . helical spring inner wire dia 26mm, l=3680mm. conforming to 60si7 t o is: 3195-92, 380 to 440bhn after hardening and tempering & to rdso specification wd-01-hl s-94 ( rev.-4 ) and to beml drawing no.901-82029, item-02, alt.-4, qty.- 01 no. / set. [ warranty period: 30 months after the date of delivery ] => limited