Drill Collar

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Product Details

Place of Origin:	Tianjin in China

Specifications

The collars are made of AISI 4145H forging or finish rolling alloy structural steel.

The drill collar are trepanned and drifted to API Spec 7.

Grinding crafts adopted finish boring technology eliminates regions of the weld stress concentration, making welding appearance more perfect, and increasing their life.

Service Process

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Service Guarantee

Free Service Charge

ECVV doesn't charge any service fee to Buyers for buying this product.
ECVV Supply

ECVV is responsible for supply, and provides product quality inspection, fund supervision and supply chain services.
Product Quality Commitment

ECVV China Sourcing Agent will assess the reputation and supply ability of the factory and conduct field trips to select the high-quality Chinese factories for buyers.
Deposit Service Commitments

In order to improve the quality of service, ECVV will charge for a 100CNY deposit for the agent purchasing order, and the deposit will be part of subsequent purchasing costs.

After paying a deposit, if the purchasing order is not completed because of unsatisfied ECVV services, ECVV will refund your deposit.