ASTM A320 qib l7 yog cov khoom siv cov ntaub ntawv tshwj xeeb rau bolts, studs, neeg rau, thiab lwm lub freakeners tsim rau cov kev siv hluav taws kub kub. ASTM A320 L7 Cov qib tau muab faib ua 4 chav kawm ua tiav, A, B, C, thiab D, cov kev ntxhov siab sib txawv. Chav kawm 660 lub fasteners yog siv los kub balers, cov hlab ntsha siab, cov yeeb nkab flanges thiab li qub rau kev kub kub.