It is used to reduce contact area with hole in order to avoid efficiently bit sticking from different pressure. Spiral drill collars are one kind of the products of our company and are manufactured strictly according to API Spec 7 and Standard SY/T5144-1997.It is used to reduce contact area with hole in order to avoid efficiently bit sticking from different pressure. spiral drill collar
big OD seamless steel pipe\ micro wind power Standard: API 5L & API 5CT ASTM A106 GR B ASTM A53 GR B SAE 1020 SAE 1045 JIS G4051 S20C JIS 3454 STPG42 JIS G3454 STGP 370 JIS 3454 STPG42 DIN ST 45-8 DIN ST 42-2Tolerate: OD +1%/-1% Thickness +12.5%/-10% Length 20mm Tolerate: OD +1%/-1% Thickness +12.5%/-10% Length 20mm wind power part
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