Drill collars we produce is made from 4145H forging or rolling modified steel. Raw Materials are all from Top China Special Steel Group, so from the first beginning, we can assure high quality. We manage our Production and Inspection Process strictly according to API SPEC 7 requirements. All connections are phosphate-coated to improve resistance to corrosion. We can also do copper plating according to clients' requirements. We offer slip groove, elevator groove to improve handling efficiency and safety. Slip and elevator groove are machined in compliance with API RP 7G guidelines. We can also make stress relief groove according to clients' requirements. We provide free thread protector for both pin and box.

Different sizes we produce is from 3 1/2" to 11", our strength is large size like above 9" and small size like below 4 3/4".

Shenlong promises our product with superior quality, long life, short delivery time and competitive price.
Welcome your enquiry any time!

Added: 23.04.2008 Offer viewed: 63 (hits)

 Other trade leads by this Member Related trade leads   Print this Page   Bookmark this ad !

Send an inquiry to nancywang relating to the offer by using bellow form:

Your name: * Email: * Your Company name: Tel: Fax: Address: Location (country): * Subject: * Message * The Security code: 8255 Type Security code into this field: