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DTH Hammers

We are JJ Rock Drills

6” DTH HAMMER SPECIFICATIONS

Sl.No Description Size Unit
1 HAMMER DIA 144 MM
2 Barrel ID 120.5 MM
3 Piston Stroke 95 MM
4 Hammer Length without Bit 1064 MM
5 Connection API 3 ½ “ Pin
6 Hammer Length with Bit Extended 1190 MM
7 Hammer Length with Bit Retracted 1155 MM
7 Size of Back Head Wrench Flat 90 MM
8 Suitable Bit DTH Digger Bit

6 1/2” DTH HAMMER SPECIFICATIONS

Sl.No Description Size Unit
1 HAMMER DIA 148 MM
2 Barrel ID 120.5 MM
3 Piston Stroke 95 MM
4 Hammer Length without Bit 1064 MM
5 Connection API 3 ½ “ Pin
6 Hammer Length with Bit Extended 1190 MM
7 Hammer Length with Bit Retracted 1155 MM
7 Size of Back Head Wrench Flat 90 MM
8 Suitable Bit DTH Digger Bit

7” DTH HAMMER SPECIFICATIONS

Sl.No Description Size Unit
1 HAMMER DIA 156 MM
2 Barrel ID 126.5 MM
3 Piston Stroke 95 MM
4 Hammer Length without Bit 1062 MM
5 Connection API 3 ½ “ Pin
6 Hammer Length with Bit Extended 1197 MM
7 Hammer Length with Bit Retracted 1152 MM
7 Size of Back Head Wrench Flat 90 MM
8 Suitable Bit DTH Digger Bit

4 3/4” DTH HAMMER SPECIFICATIONS

Sl.No Description Size Unit
1 HAMMER DIA 108 MM
2 Barrel ID 89 MM
3 Piston Stroke 95 MM
4 Hammer Length without Bit 1000 MM
5 Connection API 2.38
6 Hammer Length with Bit Extended 1120 MM
7 Hammer Length with Bit Retracted 1080 MM
7 Size of Back Head Wrench Flat 73 MM

REVERSE CIRCULATION DTH HAMMER SPECIFICATIONS

Sl.No Description Size Unit
1 HAMMER DIA 114 MM
2 Barrel ID 97.10 MM
4 Hammer Length without Bit 1185 MM
5 Connection ACMI 2.6
6 Hammer Length with Bit Extended 1315 MM
7 Hammer Length with Bit Retracted 1275 MM
7 Size of Back Head Wrench Flat 90 MM

General Care

Before shutting down at the ends of each shift we recommend the following procedures:

Well Maintained

Flush Hammer with air/oil for a few minutes. This will coat the internal hammer parts preventing corrosion/rust.

Modern Equipments

It is also good practice to pour at least half a liter of oil down the drill at startup of a new shift.

All Expert Engineers

Flush Hammer with air/water for a few minutes. Then turn off water injection.

Power Efficient Factory

Never leave the tool in a wet/muddy hole. Pull back from bottom as far as necessary to prevent the hammer sitting under water.
  • If the hammer is removed from the drill rig for any reason, it is wise to pour a quantity of oil into it and block both ends, providing the flushing as outlined in steps one and two above have been carried out.
  • If steps one and two have not been carried out the hammer should be stripped, cleaned and oiled before being stored.