MS21921航空螺母 Carbon steel, tube outside diameter: 3/8", nut, sleeve coupling, flareless, MS21921 series nut MS21921系列航空螺母 SKU / Model:MS219216 NSN: 4730-00-810-4499 飞机标准紧固件采购电话:4000-343-885 邮箱:info@hi-crane.com...