Description
In DTH drilling, the rock drilling bit is a continuation of the shank, which the rock drill piston strikes directly. Since the piston is in direct contact with the drill bit, little energy is lost. This gives DTH drilling a nearly constant penetration rate regardless of hole length.
DTH drill pipes are widely used in mining,water well drilling,geothermal,oil and all kinds of DTH rock drilling,with high quality low carbon steel to ensure good resistance to strengthen and tensile,friction welded to ensure the adapter and pipe connect tightly as a whole set the cyclic extrusion-compression ensure reliable pipe
Specification of DTH Drill pip
Sub Adapter
Box to Box
Diameter
Length
Connection Thread
Wall Thickness
mm
inch
mm
Foot
mm
inch
60
2.375
1,000~4,500
3 3/8 ~ 14 3/4
T42×10×2
5~8
13/64~5/16
76
3
1,000~4,500
3 3/8 ~ 14 3/4
2 3/8” API REG
5~8
13/64~5/16
89
3.5
1,000~7,620
3 3/8 ~ 25
2 3/8” API REG/IF
5~12
13/64~15/32
102
4
1,000~9140
3 3/8 ~ 30
2 3/8” API REG, 2 7/8” API IF, 3 1/2” API REG
6.5~20
1/4~25/32
108
4.25
1,000~9140
3 3/8 ~ 30
2 3/8” API REG, 2 7/8” API IF, 3 1/2” API REG
6.5~20
1/4~25/32
114
4.5
1,000~10,670
3 3/8 ~ 35
2 7/8” API IF, 3 1/2” API REG
6.5~20
1/4~25/32
127
5
1,000~10,670
3 3/8 ~ 35
3 1/2” API REG
8~20
5/16~25/32
133
5.25
1,000~10,670
3 3/8 ~ 35
3 1/2” API REG
8~20
5/16~25/32
140
5.5
1,000~10,670
3 3/8 ~ 35
3 1/2” API REG
10~22
25/64~7/8
146
5.75
1,000~10,670
3 3/8 ~ 35
3 1/2” API REG
10~22
25/64~7/8
152
6
1,000~10,670
3 3/8 ~ 35
4 1/2” API REG
10~22
25/64~7/8
Type
Diameter
Length
Connection Thread
mm
inch
mm
inch
API REG/IF
Pin to Box
59~146
2 3/8 ~ 5 3/4
120~235
4 23/32 ~ 9 1/4
2 3/8”, 2 7/8”, 3 1/2”, 4 1/2”
Pin to Pin
90~115
3 1/2 ~ 4 1/2
70~97
2 3/4 ~ 3 5/8
2 3/8” , 2 7/8”, 3 1/2”
77~205
3 ~ 8 1/8
200~270
7 7/8 ~ 10 5/8
2 3/8”, 2 7/8”, 3 1/2”, 4 1/2”, 6 5/8”
