We provides a full range of slick and spiral drill collars in AISI 4145H-modified steel, sour service steel (and ), non-magnetic alloys.
Drill collars from us are available with the following features: Normal Size from 2-7/8" to 11"; All steel bars must be full length heat treatment.

Mechanical properties guaranteed to 1.5" below surface at ambient temperature; Enhanced fatigue resistance (threads cold-rolled, pin-relief groove and box bore back); Phos-coated to prevent galling; And Hardbanding is available upon request.
The upper radius of the elevator recess is cold-rolled to increase product life. Slip and elevator recesses can be used together or separately.
Special drill pipe elevator designs can be supplied for automated handling operations to decrease non-productive time.

If any questions, Pleased feel free to contact with us via below details, Any of your inquiries would be highly appreciated for us. We will devoted to offering your high quality products with the most competitive price and profession serve.

We sincerely welcome you to visit us, thanks for an opportunity from you, we strive to you a satisfactory.

Looking forward to hearing from your response and friendly cooperation soon.

Thanks and Best regards,

Yours sincerely
Ms Athena
International Trade Specailist

Contact person: Ms Athena
Tel: 86-10-64800551 Cell-phone number: 86-15110134368

SYNDA Steel pipe^Supplying the best^with the best