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  Drill Collar

  Drill collars are manufactured as per API Spec 7. Heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. The specification: OD 3 1/8"--11" Length:  

  Xi'an Fengyang Petroleum Equipments... [Shaanxi, China]

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  drill collar(slick,spiral,non-magnetic)

  Drill collar: Shenlong’s drill collars are manufactured from 4145H modified steel.Drill collars are bored and drifted to API Spec7-1 and fully heated to meet or exceed the mechanical property  

  Shenlong Petroleum drillingtools Co... [Henan, China]

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  Drill collar

  Drill collarType: Slick Drill collar Spiral Drill collar Size: 3 1/8"---11" Length: 10'---31' Material: AISI 4145 H Standard: API Spec.7 and SY5144 standard   

  Huayan Petroleum Equipments Co.,... [Beijing, China]

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  Drill Collar

  The drill collar(including slick and spiral) is made in Shanxi Fenglei Machinery Manufactory Co, . Ltd in according to API SPEC. 7 latest edition. The drill tools in length from 1- to 31 feet in...  

  Shanxi Fenglei Machinery... [Shanxi , China]

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