How to identify the thread on the spiral pipe

　　The use of spiral thread to the scene to identify the most useful approach to the use of joint foot, this foot is a kind of special tag root diameter of the external thread and internal thread expansion tapered bore diameter caliper, using concise, 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 can differentiate rising spiral threaded to rise to the right of the right-handed, left to rise for the left-handed. Spiral drill threaded in the production process according to API specification rules mandate the use of thread gauge thread standoff inspection, the inspection cycle by the use of a certain individual tester for drilling screw pitch and taper to be checked.

　　Drilling screw three digits indicate the method is the Ministry of Metallurgical Industry specification SYB12604-63 rules connector code, known as the first digit indicating joint specification, the second digit indicating the type of joint, the third digit indicated the joint table in threads.

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