USD$6.5~7.5

Basic material: Steel alloy 40Cr ( AISI 5140, HRA 56-62) ;
API SPEC 11B specification manufacture;
Inside diameter: 27.43mm( error bound: 0~ + 0.25mm) ;
Outside diameter: 41....

USD$7.0~8.0

Basic material: Steel alloy 40Cr ( HRA 56-62) ;
API SPEC 11B specification manufacture;
Inside diameter: 30.61mm( error bound: 0~ + 0.25mm) ;
Outside diameter: 46.3mm( error....

USD$8.0~9.0

Basic materials: Steel alloy 40Cr ( AISI 5140, HRA 56-62) ;
API SPEC 11B specification manufacture;
I.D.: 1 3/ 8â € � ( 34.93mm)
O.D.: 2 3/ 16( 55.56mm)
Length: 4â € � ( 101....

FOB Qingdao USD PER PIECE

Yantai Yunsheng Petroleum Machine Accessories Co., Ltd, founded in 1997, is a professional manufacturer producing API approved sucker rod couplings, including Spray Metal sucker....