The DJ type surface bumper jar is a kind of stuck freeing tool for surface down jarring . it is connected with drill stem section, the jarring force is adjusted n surface . Owning some feature such as big jarring force ,easy operation ,make it especially suitable for stuck freeing of keyboard.
|
Type
Parameter |
DJ46B(4 3/4)
|
DJ70B(7)
|
|
O.D. (mm) |
121(43/4”) |
178(7”) |
|
Max.jarring force MN (tf) |
0.4(41+/-5) |
0.8(80+/-5) |
|
Sealing pressure Mpa |
20(196) |
20(196) |
|
Stroke(mm) |
1500( 59) |
1220(48) |
|
ID |
32(11/4) |
51(2”) |
|
Threads API |
NC38(31/2”) |
NC50(41/2”) |
|
Closed length (mm) |
3155(124.2”) |
3090(121.8”) |