2-3/8"-20" API 5CT J55 K55 N80 P110 Drill Collar

1. Product details:
1).OD: 2-3/8"-20"
2).Grade:J55 K55 N80 P110 etc.
3).Thread: NU EU STC LTC BTC
4).Standard: API 5CT

2. Abstract:
Drill Collars are the most important parts of all drilling string elements. The performance of drill collars will affect the efficiency of drilling. Zyzxdy mission is to provide our clients with most cost-effective products, not only price, but also products performance. We assure every piece of Drill Collar leaving our facility conforms to the requirements of API SPEC 7-1.
When producing, Traceability is maintained from the receipt of raw material to completion of final products. Serial numbers are die-stamped on each bar body.
During each manufacturing process, test and inspection are performed. We do Ultrasonic Testing and Magnetic Partial Testing before and after Heat Treatment. Specimen has been taken from each bar after heat-treatment to make Tensile Test and Impact Test. We assure the Mechanical Properties of our products comply with or exceed the requirements of API. 

3. Features:
1) Drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness
2) Cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span.
3) Thread phosphor or copper coated to achieve good resistant-wearing ability and anti-thread gluing ability.

4. Application:
Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity.