...........The design of the E.S.Bit enables the Guide Bit to perform most of the
...........drilling directly while the expanded Bit Heads perform the reaming.

...........This minimizes loss of hammer energy and maintains a high drilling efficiency.

........... Since E.S.Bit Heads expand and retract concentrically, they will drill
............and maintain a round hole.

...........The E.S.Bit system has no tendency to wander, or to produce an offset.

...........This feature assures a straight, round hole, equivalent to that drilled with
...........a conventiomal bit.

...........Afer drilling to the required depth, the E.S.Bit Heads are retracted by
...........rotating in the reverse direction when the Bit body is lifted.


..........

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//



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Type
Wing
Bit Gauge
Applicable Casing pipe
Guide Bit
Hammer Tupe
Extended
D1(mm)
Retracted
(mm)
Max. O.D.
D2(mm)
Min. I.D.
D3(mm)
Normal Size
(In.)
O.D.
D4(mm)
315
4
373
318
355.6
336.6
14"
320
SD12, DHD112, N120, K270
365
4
425
363
406.4
387.4
16"
365
SD12, DHD112, N120, K320
410
4
478
412
457.2
435.0
18"
414
SD15, K350
460
4
530
461
508.0
482.6
20"
463
SD15, K370, SD18, N180
510
4
580
509
558.8
533.4
22"
511
SD18, N180
560
4
630
559
609.6
584.2
24"
561
SD18, N180, K470
600
4
685
600
660.4
631.8
26"
603
K520, N240