D：塑料丝扣(见样品)。

D: Plastics screw thread (as per sample).

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它由盖顶、裙边和丝扣等部分构成。

The cover comprises a cover cap, skirt edge and screw threads.

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下放钻柱至丝扣部分，拧上丝扣。

Lower drill string to top of pin and engage threads.

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钻杆丝扣不是那样清洗的。

Drill pipe threads are not cleaned in that way.

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这是钻杆丝扣油，不能用在钻铤丝扣上。

The pull rod is screwed into the inside thread of the anchor head.

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这是钻杆丝扣油，不能用在钻铤丝扣上。

This is the dope for drill pipe thread.

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钻头丝扣是正规扣。

The bit thread type is regular pin.

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机修人员保证自动扣丝机的运转良好。

The repair workers are responsible for guaranteeing the normal running of the Auto-threading machine.

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机修人员保证自动扣丝机的运转良好。

The repair workers are responsible for guaranteeing the normal running of the Auto-threading machine.

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