SSAW steel pipe thread is a sign of the thread on the spiral steel pipe is produced by drilling out, the use of the site to identify the thread spiral pipe is the most useful approach to the use of joint foot, this foot is a specialized tagged external thread internal thread root diameter and expanding tapered bore diameter caliper, using simple, intuitive and precise. It can also apply directly associated with long-legged steel vernier caliper ruler to measure external thread root diameter, length, thread expanding cone threaded aperture control specification query.
Thread upright seen from the front direction of the helix rising distinguished threaded to rise to the right of the right-handed, left to rise for the left-handed.
Spiral drill pipe thread in the production process according to API specification rules apply thread gauge inspection tasks threaded standoff, according to a certain inspection cycle using drilling screw single detector to detect the pitch and taper.
Drilling screw three-digit number indicates that the Ministry of Metallurgical Industry specification method is SYB12604-63 rules connector code, known as the first digit indicates that the scale of the joint, the second digit indicates the type of joint, the third digit indicates that the table joints in threads.
