28mm coal mining roof bits

Specifications

1.28,30,32,34mm coal mining roof bits
2.do coal mining bit OEM,ISO9001
3.different shapes and combination styles bit

40mm,42mm coal mining roof bits/auger drill bit

interduction about company:

Henan Zhongmei Drill Tool Co.,Ltd ,which is a provate enterprise,specializes in drilling tools,the main products are as following:pdc drill bit series,Tricone bits series,diamond bit series,TC drill bit series,Ballistic bit seriesand drill rods series.

 

 

the featured about PDC anchor drill bits:

PDC anchor drill bits are widely application in coal mining, oil/gas field, geological exploration,  water conservarcy, power engineering , and other many industries, The wings of cutter are made from PDC.They have faster drilling speed and longer life when drilling soft to medium stratum(f≤10).
Drilling holes without the contract og the diameter,the quality of the drilled hole is perfect and decreasing the waste of rolled up powder and anchor-shank.

Speifications(mm) :

25,27,28,29,30,32,36,42.

Normal Thread Model: M16*2; M14*1.5, M12*1.75; M14*1.5; M12*1.75

Notes:Non-standard items also can be made as your requirements.