1, the thread with buttress thread or hook type thread, thread bearing surface angle for -3 or +7.5 degrees, the screw thread structure not sticky buckle and high connecting strength
2, the thread guiding surface angle design for +30 or +20 degrees, convenient led buckle, buckle, screw fastening operation
3, double stage straight pipe thread taper design, easy into the buckle, led buckle, buckle buckle on good, fast
4, a sealing step design using triangular, rectangular mixing stage design, metal to metal seal (two stage seal) + auxiliary level (level three auxiliary seal)
The Product Standard: API SPEC 5CT9thPSL1; PSL2; PSL3;
Size:1"9~13-3/8"
Grade:H40,J55,K55,N80,L80,R95(C95),T95,P110,Q125