DTH (Down The Hole) Hammer


ROCK BREAKING TOOL

(WITH VARIOUS SHANKS OF DHD, SD, QL, ETC.)

For Efficient anchoring, quarry, construction and water well drilling, DTH(Down The Hole) Hammers are heavy duty tools with simple design providing Maximum performance at minimum maintenance.

DTH Hammers with various models are to be operated at efficiency for each individual application.

DTH Hammers are basically Ingersoll-Rand DHD & Sandvik-MISSION SD type with lots of improvement to meet the demand on price & quality from the customers


APPLICATIONS

  • WATER WELL DRILLING

  • OIL WELL DRILLING

  • GAS WELL DRILLING

  • CONSTRUCTIONAL FOUNDATION FRILLING

  • MINING BLAST HOLE DRILLING

  • GEOTHERMAL DRILLING




* We have been sellling CS POWER HAMMERS since 1997.

* We have about 500 sales references (drilling companies).

* Hammer life expectancy for medium hard formation: about 50,000 ft.

* Warranty: 10,000 ft or 120 days after sales, whichever comes first.


DTH(DOWN THE HOLE) Hammer Specification
MODEL SPECIFICATION CS-30
3"
CS-40
4"
CS-50
5"
CS-60-H
6"HIGH
CS-60-L
6"LOW
CS-80
8"
CS-100
10"
CS-112
12"
TOP SUB(BACKHEAD) CONNECTION API
2-3/8"
REG
PIN
API
2-3/8"
REG
PIN
API
3-1/2"
REG
PIN
API
3-1/2"
REG
PIN
API
3-1/2"
REG
PIN
API
4-1/2"
REG
PIN
API
6-5/8"
REG
PIN
API
6-5/8"
REG
PIN
CHUCK
CONNECTION
CONFIGURATION
DHD3.5 A3015 DHD 340 A3415, SD4
QL40
DHD 350 A4315 SD5 DHD 360 A5315 SD6 DHD 360 A5315 SD6
QL60
DHD 380 A6315 SD8
QL80
NUMA N100 SD10 DHD 112 SD12
QL120
AVAILABLE
BIT SIZE
86~127 MM
3-3/8"~5"
105~130 MM
4-1/8"~5-1/8"
127~152 MM
5"~6"
149~225 MM
5-7/8"~8-7/8"
149~225 MM
5-7/8"~8-7/8"
191~311 MM
7-1/2"~12-1/4"
251~311 MM
9-7/8"~12-1/4"
301~445 MM
11-7/8"~17-1/2"
LENGTH(WITHOUT BIT) /MM IR945 MI978 IR1044 MI1088 IR1162 MI1162 IR1368 MI1383 IR1236 MI1253 IR1420 MI1390 IR1545 MI1527 IR2100 MI1875
OUTSIDE DIAMETER 78 MM
(3.1")
97 MM
(3.8")
117 MM
(4.6")
138 MM
(5.4")
138 MM
(5.4")
180 MM
(7.1")
226 MM
(8.9")
272 MM
(10.7")
CYLINDER BORE 58 MM
(2.28")
75 MM
(3.00")
91 MM
(3.58")
108 MM
(4.25")
108 MM
(4.25")
148 MM
(5.83")
170 MM
(6.69")
216 MM
(8.50")
PISTON STROKE 100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
100 MM
(3.9")
NET WEIGHT (WITHOUT BIT) 28 KG
(62 LB)
40 KG
(88 LB)
65 KG
(143 LB)
108 KG
(238 LB)
95 KG
(209 LB)
185 KG
(407 LB)
335 KG
(737 LB)
620 KG
(1364 LB)
GROSS WEIGHT (W/WOODEN BOX) 33 KG
(73 LB)
50 KG
(110 LB)
79 KG
(174 LB)
125 KG
(275 LB)
105 KG
(231 LB)
206 KG
(453 LB)
373 KG
(821 LB)
660 KG
(1452 LB)
MEASUREMENT 7"x9"x42" 7"x9"x47" 9"x10"x53" 9"x10"x58" 9"x11"x50" 11"x12"x62" 12"x14"x65" 14"x16"x79"

MODEL SPECIFICATION CS-320
15"
CS-350
17"
CS-380
19"
CS-410
21"
CS-460
25"
CS-530
28"
CS-750
36"
TOP SUB (BACKHEAD) CONNECTION API
6-5/8"
REG
PIN
API
7-5/8"
REG
PIN
API
7-5/8"
REG
PIN
API
8-5/8"
REG
PIN
API
8-5/8"
REG
PIN
API
8-5/8"
REG
PIN
API
8-5/8"
REG
PIN
CHUCK
CONNECTION
CONFIGURATION
SD-15 SD-15 SD-18 SD-18 SD-18 KOREAN OWN MODEL KOREAN OWN MODEL
AVAILABLE BIT SIZE 380~480 MM
(15.0"~18.9")
400~525 MM
(15.7"~20.7")
440~570 MM
(17.3"~22.4")
445~615 MM
(17.5"~24.2")
510~690 MM
(20.1"~27.2")
610~795 MM
(24.0"~31.3")
760~1125 MM
(29.9"~44.3")
LENGTH(WITHOUT BIT) 1961 MM
77.2"
1961 MM
77.2"
1961 MM
77.2"
1965 MM
77.4"
1970 MM
77.6"
1981 MM
78.0"
1991 MM
78.4"
OUTSIDE DIAMETER 320 MM
12.6"
350 MM
13.8"
380 MM
15.0"
410 MM
16.1"
460 MM
18.1"
530 MM
20.9"
700 MM
29.5"
CYLINDER BORE 266 MM
10.47"
279 MM
10.98"
290 MM
11.41"
340 MM
13.39"
380 MM
14.96"
430 MM
16.93"
508 MM
20.00"
PISTON STROKE 110 MM
4.33"
125 MM
4.92"
125 MM
4.92"
125 MM
4.92"
125 MM
4.92"
130 MM
5.12"
130 MM
5.12"
NET WEIGHT (WITHOUT BIT) 920 KG
2024LB
1250 KG
2750LB
1500 KG
3300LB
1790 KG
3940LB
2100 KG
4620LB
3000 KG
6600LB
5350 KG
11770LB
GROSS WEIGHT (W/WOODEN BOX) 945 KG
2134LB
1320 KG
2904LB
1590 KG
3498LB
1810 KG
3982LB
2220 KG
4884LB
3200 KG
7040LB
5600 KG
12320LB
In line with our policy of continuous product development, the information and specifications
in this website are subject to change without notice.

AIR CONSUMPTION, AT SEA LEVEL CFM & (M3/min)
MODEL
PRESSURE
CS-30
3"
CS-40
4"
CS-50
5"
CS-60-H
6"High
CS-60-L
6"Low
CS-80
8"
CS-100
10"
CS-112
12"
100PSI (6.8BAR) 170 (4.8) 190 (5.4) 200 (5.7) 270 (7.6) 300 (8.5) 400 (11.3) 500 (14.1) 600 (16.9)
150PSI (10.3BAR) 245 (6.9) 265 (7.5) 285 (8.1) 385 (10.9) 450 (12.7) 585 (16.5) 750 (21.2) 880 (24.8)
200PSI (13.8BAR) 350 (9.8) 365 (10.3) 400 (11.3) 545 (15.4) 600 (17.0) 840 (23.7) 1050 (29.7) 1100 (31.1)
250PSI (17.2BAR) 485 (13.7) 485 (13.7) 520 (14.7) 715 (20.2) 795 (22.5) 890 (25.2) 1200 (34.0) 1450 (41.1)
300PSI (20.7BAR)   600 (16.9) 645 (18.3) 865 (24.5) 940 (26.7) 1085 (30.7) 1600 (45.3) 1880 (53.2)
350PSI (24.1BAR)   705 (19.9) 770 (21.7) 924 (26.2) 1030 (29.3) 1520 (43.0) 1800 (51.0)  



MODEL
PRESSURE
CS-320
15"
CS-350
17"
CS-380
19"
CS-410
21"
CS-460
25"
CS-530
28"
CS-750
36"
100PSI (6.8BAR) 800 (22.7) 1120 (31.7) 1200 (34.0) 1220 (34.5) 1280 (36.2) 1390 (39.4) 1500 (42.5)
150PSI (10.3BAR) 1100 (31.1) 1740 (49.3) 1800 (51.0) 1840 (52.1) 1870 (53.0) 2010 (56.9) 2140 (60.6)
200PSI (13.8BAR) 1700 (48.1) 2200 (62.3) 2450 (69.4) 2500 (70.6) 2730 (77.3) 2900 (82.1) 3050 (86.4)
250PSI (17.2BAR)   2780 (78.7)          
300PSI (20.7BAR)              
350PSI (24.1BAR)              
In line with our policy of continuous product development, the information and specifications
in this website are subject to change without notice.
Size 3" ~ 5"
No Size/Type 3" IR 3" MS 4" IR 4" MS 4" QL 5" IR 5" MS
Parts Description
I-R=DHD, MS=Mission
Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs)
1 BACKHEAD 11.20 11.20 16.06 16.06 16.06 25.08 25.08
2 BACKHEAD WASHER N/A N/A N/A N/A N/A N/A N/A
3 BACKHEAD O-RING 0.01 0.01 0.01 0.01 0.01 0.02 0.02
4 BUFFER RING 1.00 1.00 0.02 0.02 0.02 0.03 0.03
5 BUFFER SPRING N/A N/A N/A N/A N/A N/A N/A
6 CHECK VALVE 0.10 0.10 0.99 0.10 0.10 0.10 0.10
7 CHECK VALVE SPRING 0.10 0.10 0.99 0.09 0.09 0.11 0.11
8 AIR DISTRIBUTOR 3.50 3.50 4.40 4.40 4.40 6.16 6.16
9 AIR DISTRIBUTOR O-RING 0.10 0.22 0.01 0.01 0.01 0.01 0.01
10 CYLINDER 4.20 4.20 5.94 5.50 5.50 6.60 6.60
11 CYLINDER STOP RING N/A 0.22 N/A N/A N/A N/A N/A
12 WEAR SLEEVE 27.30 32.34 36.08 38.72 36.96 58.74 59.40
13 PISTON 11.40 11.44 16.28 16.50 18.04 25.30 25.52
14 PISTON STOP RING 0.10 0.10 0.02 0.02 0.07 0.03 0.03
15 SPACER N/A N/A N/A N/A N/A N/A N/A
16 BIT RETAINING RING O-RING 0.01 0.01 0.01 0.01 0.01 0.01 0.01
17 BIT RETAINING RING 0.44 0.44 0.55 0.55 0.51 0.66 0.77
18 GUIDE BUSH N/A N/A N/A N/A N/A N/A N/A
19 CHUCK WASHER 0.22 0.22 N/A N/A N/A N/A N/A
20 CHUCK 5.94 6.82 8.36 9.24 7.26 11.44 12.10
In line with our policy of continuous product development, the information and specifications
in this website are subject to change without notice.


Size 6" ~ 8"
No Size/Type 6" HIR 6" HMS 6" LIR 6" LMS 6" QR 8" IR 8" MS
Parts Description
I-R=DHD, MS=Mission
Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs)
1 BACKHEAD 38.50 38.50 38.50 38.50 38.50 90.20 90.20
2 BACKHEAD WASHER N/A N/A N/A N/A N/A N/A N/A
3 BACKHEAD O-RING 0.04 0.04 0.04 0.04 0.04 0.04 0.04
4 BUFFER RING 0.04 0.04 0.04 0.04 0.04 0.02 0.02
5 BUFFER SPRING N/A N/A N/A N/A N/A N/A N/A
6 CHECK VALVE 1.54 1.54 1.54 1.54 1.54 2.20 2.20
7 CHECK VALVE SPRING 0.13 0.13 0.13 0.13 0.13 0.20 0.20
8 AIR DISTRIBUTOR 16.50 16.50 16.50 16.50 16.50 27.72 27.72
9 AIR DISTRIBUTOR O-RING 0.01 0.04 0.01 0.04 0.04 0.01 0.01
10 CYLINDER 14.08 14.08 N/A N/A N/A 19.36 19.36
11 CYLINDER STOP RING N/A N/A N/A N/A N/A N/A N/A
12 WEAR SLEEVE 99.00 92.40 99.00 92.40 96.80 145.20 129.80
13 PISTON 47.30 47.52 47.30 47.52 47.30 84.48 84.92
14 PISTON STOP RING 0.04 0.04 0.04 0.04 0.04 0.09 0.05
15 SPACER 5.50 N/A 5.50 N/A 5.50 N/A N/A
16 BIT RETAINING RING O-RING 0.01 0.01 0.01 0.01 0.01 0.01 0.01
17 BIT RETAINING RING 0.99 0.99 0.99 0.99 0.99 3.08 2.64
18 GUIDE BUSH N/A N/A N/A N/A N/A N/A N/A
19 CHUCK WASHER N/A N/A N/A N/A N/A N/A N/A
20 CHUCK 12.10 22.00 12.10 22.00 12.10 36.30 49.28
In line with our policy of continuous product development, the information and specifications
in this website are subject to change without notice.


Size 8" ~ 12"
No Size/Type 8" QL 10" MS 12" MS CS 350 10" IR 12" IR
Parts Description
I-R=DHD, MS=Mission
Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs) Weight(lbs)
1 BACKHEAD 90.20 194.92 269.06 378.40 88.60 122.30
2 BACKHEAD WASHER N/A 1.32 2.42 4.18 0.60 1.10
3 BACKHEAD O-RING 0.04 0.05 0.09 0.07 0.02 0.04
4 BUFFER RING 0.20 0.44 N/A 2.20 0.20 N/A
5 BUFFER SPRING N/A N/A 17.60 N/A N/A 8.00
6 CHECK VALVE 2.20 2.20 1.10 3.30 1.00 0.50
7 CHECK VALVE SPRING 0.20 0.20 0.22 1.17 0.09 0.10
8 AIR DISTRIBUTOR 27.72 40.92 68.42 118.80 18.60 31.10
9 AIR DISTRIBUTOR O-RING 0.01 0.02 0.02 0.07 0.01 0.01
10 CYLINDER 19.36 31.68 58.08 81.40 14.40 26.40
11 CYLINDER STOP RING N/A N/A 3.08 N/A N/A 1.40
12 WEAR SLEEVE 145.20 281.60 506.00 961.40 125.00 241.00
13 PISTON 84.48 103.40 264.66 415.80 51.30 125.30
14 PISTON STOP RING 0.05 0.06 1.10 1.10 0.03 0.50
15 SPACER N/A N/A N/A N/A N/A N/A
16 BIT RETAINING RING O-RING 0.01 0.02 0.02 0.07 0.01 0.01
17 BIT RETAINING RING 3.08 6.16 10.12 20.90 2.00 4.30
18 GUIDE BUSH N/A N/A 22.66 4.18 N/A 10.30
19 CHUCK WASHER N/A 1.32 2.42 18.04 0.06 1.10
20 CHUCK 31.68 49.72 98.34 257.40 25.40 45.80
In line with our policy of continuous product development, the information and specifications
in this website are subject to change without notice.

Hammer Malfunction

FAULT

CAUSE

SOLUTION / ACTION

Hammer does not start operating after tube change.

-Excess oil drained down into the hammer.

-Foreign particles in the hammer.

-Hammer filled with water and mud, especially if drilling under water level.

-Lift off and flush. Apply small amounts of diesel to flush through if necessary.

-Remove, inspect and clean the hammer.

-Ensure that the hole is 'clean' before uncoupling tubes for tube changes.

-Ensure that the non-return valve or the intertube non return valve (if drilling in deep water.) is fitted to the hammer.

Hammer operates on the surface but fails to work when lowered into the hole

-Drill bit flushing holes are blocked with clay, or debris whilst being lowered into the hole.

-Lowering into soft clay that disallows bit to be pushed up into the hammer.

-Inspect and strip if necessary.

-Increase rotation speed and thrust to force through soft ground, keeping full air on at all times and lifting constantly to flush.

-Water injection can be used to break up soft clay.

Hammer operates intermittently on surface test or down-the-hole.

-Hammer parts worn, broken or seized.

-Hammer was incorrectly assembled.

-Dirt or foreign particles in hammer.

-Excessive lubricating oil or other oil coming through the system.

-Excessive water in the compressed air.

-Hammer freezing.

-Strip, Inspect and service.

-Strip and re-assemble correctly. -Strip, clean and re-assemble.

-Check quantity of lubricating oil and for signs of compressor oil in the air line.

-Check moisture trap and water injection pump, if in use.

-Use antifreeze type oil

-Check for signs of excessive water in system.

Hammer deviates at the start of drilling.

-Insufficient or no air reaching hammer.

-Hammer incorrectly assembled.

-Dirt or foreign particles in hammer.

-Hammer has retained oil or anti-seize grease.

-Hammer parts worn, broken or seized up.

-Blockage in shock absorber.

-Flushing holes in drill bit blocked.

-Check compressor operation Strip and re-assemble correctly.

-Strip, clean and re-assemble.

-Flush through hammer by lifting off the bottom of the hole.

-Add a small amount of diesel to the hammer to clear the oil.

-Strip, inspect and service.

-Unscrew hammer and check.

-Strip shock absorber if necessary.

-Clean out drill bit holes.

 

 

Drill Tube

FAULT

CAUSE

SOLUTION / ACTION

Drill tube joints excessively tight especially nearest to the hammer.

- Excessive feed force.

-Collaring in the hole.

-Worn or broken drill bit. -Insufficient anti-seize grease on thread joints.

-Excessive tightening when assembling joints with rotation head.

-Adjust feed force to correct recommended levels.

-Pull out, re-sharpen or renew.

-Clean and re-grease all joints.

-Tighten sufficiently.

- Do not apply full forward rotation torque to joint.

 

 

Drill Bit

FAULT

CAUSE

CAUSE

Drill bits difficult to strip due to tightness of chuck joint.

-Too high a feed force.

-Bad ground requiring high torque.

-Insufficient anti-seize grease on thread.

-Adjust feed force to recommended level.

-Drill through bad ground carefully keeping a clean hole.

-Use sufficient anti-seize grease on chuck heard when screwing in the drill bit and chuck.

Drill bit and chuck becomes unscrewed

-Hammering with no rotation, reverse rotation or back

-hammering Chuck or cylinder thread worn out.

-Always keep rotation to the right or clockwise when hammering.

-Renew chuck or cylinder or both.

 

 

Flushing

FAULT

CAUSE

SOLUTION / ACTION

Flushing air is insufficient for good hole cleaning.

-Operating pressure of hammer too low.

-Up-hole velocity is too low.

-Collar or blockage in hole. -Flushing air being lost in fissures.

-Check air pressure as near to hammer as possible.

-Check compressor operation.

-Increase air volume or air pressure.

-Increase drill tube diameter.

-Reduce drill bit diameter.

-Flush more regularly.

-Check for air leaks.

-Pull drill string up past blockage to clear collar.

-Drill slowly until beyond fissures.

-Flushing then return.

Flushing of debris from hole reduces or stops completely

-Collar or blockage in hole. -No air reaching the hammer.

-Build-up of debris.

-Ground water reached causing mud collar.

-Pull drill string up past blockage to clear collar.

-Check compressor operation.

-Lift and flush, pull up as far as required to resume flushing.

-Lift and flush, pull up to clear.

-If necessary use foam.

Flushing action of hammer does not work when hammer lifted into flushing position.

-Insufficient or no air reaching hammer.

-Hammer incorrectly assembled.

-Dirt or foreign particles in hammer.

-Drill bit not dropping into flushing position.

-Blockage in shock absorber.

-Flushing holes in drill bit blocked.

-Check compressor operation.

-Strip and reassemble correctly.

-Strip, clean and reassemble.

-Remove drill bit and chuck to ascertain cause.

-Unscrew hammer and check.

-Strip shock absorber if necessary.

-Clean out holes.

 

 

Penetration Speed

FAULT

CAUSE

SOLUTION / ACTION

Penetration rates low or zero

-Low operating pressure. -Hole not clear. -Blocked with drilling debris.-Hard band of rock. -Hammer blocked, parts worn, seizing up or broken. -Drill bit excessively worn or broken. -Too low a rotation speed.-Excessive lubricating oil or water injection being used.-Faulty feed mechanism on drill rig. -Large head of water in hole.

-Check air pressure at hammer and compressor operation.-Check for air leaks in air line.-Lift and flush, pull up to clear.-Time the penetration rate over next two drill tubes and compare with expected penetration rate.-Pull up and inspect. Pull up, check drill bit. -Re-grind if necessary. -Keep rotation speed to recommended level. -Check quantities of both being injected. -Check drill rig feed operation.-Flush to see how much water in hole. -Increase operating pressure to compensate if possible. -Use foam to assist with cutting evacuation.

 

 

Vibration

FAULT

CAUSE

SOLUTION / ACTION

Vibration / Squealing noises from bore hole.

-Too low a feed force.

-Too high a rotation speed.

-Difficult ground conditions.

-Drill bit worn out.

-Drill bit broken in hole.

-Obstruction in the hole.

-Loss of gauge on drill bit head.

-Metal particles in the bore hole.

-Adjust feed force to recommended level. -Reduce rotation speed to recommended level.

-Drill carefully, flushing often and keeping feed force and rotation speed low.

-Pull up and re-grind or renew bit.

-Pull up and check.

-Pull back to allow obstruction to fall below hammer.

-Re-face gauge with die grinder

-Pull out drill string and use magnet to retrieve particles from hole.

 

 

 

Rotation

FAULT

CAUSE

SOLUTION / ACTION

Rotation stiff or stalls easily.

-Excessive feed force.

-Collar or stone in the hole, which is binding on the drill tubes.

-Drill bit worn out.

-Hole has moved 'out of line'.

-Faulty rotation head.

-Reduce feed force to recommended level.

-Lift to flush clear.

-Pull out and re-grind or renew drill bit. -Re-align machine over hole carefully. -Repair or adjust rotation head.

MAINTENANCE MANUAL


CONTENTS


1. INTRODUCTION

2. MAINTENANCE

     A) DISASSEMBLE

     B) INSPECTION

     C) ASSEMBLE

3. STORAGE

     A) SHORT TERM STORAGE

     B) LONG TERM STORAGE

     C) RESTARTING

4. LUBRICATION


Click here to download the Maintenance Manual


Bestma USA Return Policy


Limited Warranty

The warranty period of a Bestma hammer is 10,000 ft or 120 days after sale, whichever comes first. For the duration of the warranty period, Bestma warrants to its purchaser that all products supplied by it will meet or exceed the specification sheet it has provided, and will be free from defects in materials and workmanship. If at anytime during the warranty period the product fails to meet the foregoing warranties, Bestma will, at its own discretion, replace the defected product with another, or refund the purchase price paid.

Returns

Except as provided in the limited warranty section, all products are not returnable for any reason.