Atlas Copco Products

DHD12 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.

DHD12 General Specifications:

	Standard		Deep Hole
	English	Metric	English	Metric
Standard drill pipe connection (see options)	6-5/8 API reg pin		6-5/8 API reg pin
Outside diameter (inch & mm)	10.88	276	10.88	276
Length w/o bit shoulder to shoulder (inch & mm)	71.3	1,811	71.3	1,811
Length with bit extended (inch & mm)	80.6	2,047	80.6	2,047
Length with bit retracted (inch & mm)	78.6	1,996	78.6	1,996
Weight w/o bit (lb & kg)	1,318	599	1,286	585
Backhead across flats (inch)	4 x 1-5/16 AF		4 x 1-5/16 AF
Minimum bit size (inch & mm)	11.9	302	11.9	302
Maximum bit size (inch & mm)	18.5	470	18.5	470
Bore (inch & mm)	8.5	216	8.5	216
Piston weight (lb & kg)	250	114	250	114
Stroke (inch & mm)	4.0	102	4.0	102
Maximum pressure differential (psig & bar)	250	17	250	17
Maximum choke diameter (inch & mm)	0.88	22.3	0.88	22.3
Make-up torque (ft-lb. & N-m)	12,000	16,248	12,000	16,248
Shank style	DHD112		DHD112

 

	"Slim"
	English	Metric
Standard drill pipe connection (see options)	4-1/2 API reg pin
Outside diameter (inch & mm)	10.0	254
Length w/o bit shoulder to shoulder (inch & mm)	71.3	1,811
Length with bit extended (inch & mm)	80.6	2,047
Length with bit retracted (inch & mm)	78.6	1,996
Weight w/o bit (lb & kg)	562	1,237
Backhead across flats (inch)	4 x 1-5/16 AF
Minimum bit size (inch & mm)	11.0	279
Maximum bit size (inch & mm)	18.5	470
Bore (inch & mm)	8.5	216
Piston weight (lb & kg)	250	114
Stroke (inch & mm)	4.5	114
Maximum pressure differential (psig & bar)	250	17
Maximum choke diameter (inch & mm)	0.88	22.3
Make-up torque (ft-lb. & N-m)	12,000	16,248
Shank style	DHD112

Air Consumption:

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