Qingdao Nokunda Drilling Tools Co., Ltd.

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Qingdao Nokunda Drilling Tools Co., Ltd.  

 No. 15 Donghai Xi Road, Shinan District, Qingdao City, Shandong Province, China

Whatsapp: +86 13792983690

Wechat: +86 13792983690 

Email: [email protected]

 

 

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7 7/8" NGA635

7 7/8" NGA635
Product Name : 7 7/8" NGA635
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CUTTING STRUCTURE

Conical on gage, double spherical on inner rows.
Designed for high compressive strength, medium hard and abrasive formations,
such as limestone, sandstone, interbedded dolomite.
Compressive strength: 29,000-38,000 psi/200-262 MPa

 

SHIRTTAIL PROTECTION

Hard welding and wear resistant carbide protection on shirttail lip and lug

 

PRODUCT SPECIFICATION

IADC Code:  635

Bearing Type: Roller-Ball-Roller-Thrust Button / Sealed Bearing

Circulation Type: Jet Air

Cutting Structure: 

Inner and Nose Rows: Double spherical and concial

Gage Rows: Conical

Gage Bevel Protection: Ovoid

Pin Connection: 4 1/2″ API REG

Metric Bit Diameter: 200 mm

Product Weight: 75 lbs/34 kg

 

OPERATING SUGGESTIONS 

Weight on Bit: 27,337 bs / 12.4T MAX

Rotary Speed: 60-100rpm

Air Back Pressure: 29-58 psi/0.2-0.4 MPa

 

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