(1) Our main clients : Germany, Japan, Romania, the Czech republic, Italy, Britain, Austria, Switzerland, the United States, Argentina, Singapore have imported. Import standards with reference to the American petroleum institute standard API5A, ax, 5 5 ac. Grade of steel is 40, H - J - 55, N - 80 - P - 110, C - 75, C - 95, etc. Specifications are mainly 139.77.72 R - 2177.89. 19 R - 2244.58. 94 R - 94. 03 R - 2244511. 05 R - 2, etc.

(2) there are three kinds of API specified length: R - 1 was 4.88 ~ 7.62 m, 2 is 7.62 ~ 10.36 m, R - R - 10.36 3 m to longer.
(3) marked LTC parts imported goods, the filament fastener sleeve.