Ma studio 660, osakhala maginito muzovala, koma amatha kukhala matsenga pang'ono ndi kuwala. Ngakhale ili ndi mphamvu zofananira ndi zipolopolo ngati zitsulo zina, astme A453 GR. 660 Hex Bolts Bolts amatulutsa ma welds okwanira chifukwa cha zomwe zatsika kaboni. Astme A453 ma studio 660 ndioyenera kugwiritsa ntchito kutentha. Kalasi iyi ya oyeserera imagawidwa mu A, B, C, D Maphunziro. Zipangizo ndi kaboni, manganese, phosphorous, sulufun, silicon, nicken, chremium, molbdenum, alumium, kuvadium, Boron. Astme A453 ma grade 660 ma bolts amatenga mphamvu ndi kukana chifukwa chophatikiza zinthu.