DHD4 Classic Hammer

Atlas Copco Rock Drilling Tools -
Secoroc Down the Hole Equipment

Time-Tested Design

Our DHD Classic product line is available for drilling contractors, owner-operators, and large corporations who are specifically looking for the lowest priced drill. This time-tested design is practically bullet proof -- it has been in continuous, successful use in the industry for over 30 years.

DHD4 General Specifications:

	Standard		Deep Hole
	English	Metric	English	Metric
Standard drill pipe connection (see options)	2-3/8 API reg pin		2-3/8 API reg pin
Outside diameter (inch & mm)	3.6	92	3.6	92
Length w/o bit shoulder to shoulder (inch & mm)	41.3	1,049	41.3	1,049
Length with bit extended (inch & mm)	45.6	1,158	45.6	1,158
Length with bit retracted (inch & mm)	44.5	1,130	44.5	1,130
Weight w/o bit (lb & kg)	85	39	80	36
Backhead across flats (inch)	1-3/4 x 2-1/2 AF		1-3/4 x 2-1/2 AF
Minimum bit size (inch & mm)	4.1	105	4.1	105
Maximum bit size (inch & mm)	5.0	127	5.0	127
Bore (inch & mm)	2.9	75	2.9	75
Piston weight (lb & kg)	17.1	8	17.1	8
Stroke (inch & mm)	4.0	102	4.0	102
Maximum pressure differential (psig & bar)	350	25	350	25
Maximum choke diameter (inch & mm)	0.35	8.9	0.35	8.9
Make-up torque (ft-lb. & N-m)	4,000	5,416	4,000	5,416
Shank style	DHD340		DHD340

 

Air Consumption:

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