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API SPEC 7-1 drill collar is made with rolling or forging AISI4145H chromium molybdenum alloy steel. Therefore, it needs to control chemical composition and the content of trace elements effectively.

Specification

Standard	Number	OD (in.)	ID (in.)	Length (ft)	Weight (lb/ft)	Typical Bending Strength Ratio
SY5144-2007/API7-1	NC 23-31	3-1/8	1-1/4	30	22	2.57:1
	NC 26-35 (2-3/8 IF)	3-1/2	1-1/2	30	27	2.42:1
	NC 31-41 (2-7/8 IF)	4-1/8	2	30 or 31	34	2.43:1
	NC 35-47	4-3 /4	2	30 or 31	47	2.58:1
	NC 38-50 (3-1/2 IF)	5	2-1/4	30 or 31	54	2.38:1
	NC 44-60	6	2-1/4	30 or 31	83

FACTORY

APPLICATION AREAS

FAQ

How many countries have you exported? do you have service there?

We have exported to more than 75 countries. Please contact us to get the local service.Moreover, as we progress, we are confident that we can achieve even greater accomplishments.

Could we be your agent in our country?

Yes, we are looking for worldwide agents now.We too wish to join hands in pursuing mutual development, thereby achieving a synergistic effect where the whole is greater than the sum of its parts.

What certificates do you have?

We have certificates of CE,ISO9001 .

Where is your company? Where is the loading port?

Our company is situated in Tai'an City, Shandong Province. The nearest ports to us are Qingdao Port and Tianjin Port, both of which can be reached within the same day.

Are you manufacturer?

Yes, we are a manufacturing facility specialising in the production of steel pipes, screw piles and similar products, employing processes such as welding, stamping and cutting.

Oil country tubular goods