finish_plaingrade_10grade_4-8grade_a2grade_a4grade_springinsidediameter_6mmmaterial_alloysteelmaterial_hitensilematerial_mildsteelmaterial_stainlesssteeloutsidediameter_16mmoutsidediameter_19mmperpack_1perpack_100perpack_1000perpack_200perpack_50perpack_500thread_1.6mmunit_metric