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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8 1/2" NGA835

8 1/2" NGA835
Product Name : 8 1/2" NGA835
Directions

CUTTING STRUCTURE

Ovoid on gage row, Ogive on inner rows.
Designed for high compressive strength, hard formations,
such as Magnet Quartzite, Quartzite,Granite.
Compressive strength: 55,000-66,000 psi

 

SHIRTTAIL PROTECTION

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

 

PRODUCT SPECIFICATION

IADC Code:  835

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

Circulation Type: Jet Air

Cutting Structure: 

Inner  Rows: Ovoid 

Gage Rows: Ovoid

Bevel Protection: Ovoid

Pin Connection: 4 1/2″ API REG

Metric Bit Diameter: 216 mm

Product Weight: 84 lbs/38 kg

 

OPERATING SUGGESTIONS 

Weight on Bit: 42,500 - 68,000 bs / 19.3-30.8T 

Rotary Speed: 50-80rpm

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

 

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