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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9 7/8" NGA715

9 7/8" NGA715
Product Name : 9 7/8" NGA715
Directions

CUTTING STRUCTURE

Conical on gage, double spherical on inner rows.
Designed for high compressive strength, hard and abrasive formations, such as granite, limestone, sandy shale, dolomite, chert.
Compressive strength: 37,000-44,000 psi/255-303 MPa

 

SHIRTTAIL PROTECTION

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

 

PRODUCT SPECIFICATION

IADC Code:  715

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

Circulation Type: Jet Air

Cutting Structure: 

Inner and Nose Rows: Double spherical

Gage Rows: Conical

Gage Bevel Protection: Flat

Pin Connection: 6 5/8″ API REG

Metric Bit Diameter: 251 mm

Product Weight:143 lbs/65 kg

 

OPERATING SUGGESTIONS 

Weight on Bit: 39,500-59,250 bs / 17.9-26.9T 

Rotary Speed: 60-90rpm

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

 

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