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Secoroc QLX 50/55 Down the Hole Hammer
QLX 50/55 - The Latest in High Performance DTH Hammers
At Atlas Copco Secoroc, we keep looking for new ways of improving our customers' productivity. That’s why we have taken the best of the QL design, thrown in a few new ideas, and created the Secoroc QLX 50 and QLX 55 down the hole hammers.
QLX 50 and QLX 55 are primarily deep hole hammers, but have also proven to be high performance hammers for other applications.
These new 5" hammers offer 20% more all-around performance than the QL hammers and better water-logged deep hole drilling capacity than its predecessor, the TD 50 hammer. They are benchmarks with the highest rate of penetration (ROP) and reliability that are a cut above the rest, thanks to solutions such as the new e-kit making servicing easier and quicker to execute. The QLX 55 has thicker heavy duty (HD) casing for longer service life when drilling in abrasive rock formations.
The QLX 50 and QLX 55 have been stringently field tested in the USA and Sweden prior to launch. They have proven outstanding in water well, geothermal drilling, and other applications thanks to the Air Select feature that enables the QLX to match a variety of air packages while utilizing the excess air for hammer power.


QLX 50/55 DTH Hammer Specifications |
- Field-proven check system.
- Robust detent system.
- Proven Quantum Leap air cycle provides "power" for 80% of piston down stroke.
- Air Select system allows selectable timing to maximize hammer performance to match air package.
- Reversible casing to maximize wear.
- Industry leading QL style shank.
|
General Specifications |
QLX 50 |
QLX 55 |
|
Air Consumption and Impact Frequency (with Air select on default setting 2) |
Connection thread |
3 1/2" API Reg Pin |
Air Pressure |
scfm |
bpm** |
Bit shank |
QL 50 |
100 psi |
155 |
1305 |
Outside diameter |
4.8" |
5.08" |
150 psi |
257 |
1426 |
Length w/o bit shoulder to shoulder |
41.76" |
41.76" |
200 psi |
374 |
1547 |
Weight w/o bit |
153.0 lbs. |
178.0 lbs. |
250 psi |
508 |
1668 |
Backhead across flats |
3.7" / 4" |
3.7" / 4" |
300 psi |
657 |
1788 |
Recommended minimum bit size |
5.25" |
5.5" |
350 psi |
822 |
1909 |
Recommended maximum bit size |
6" |
6" |
400 psi* |
961 |
2029 |
Bore |
3.95" |
3.95" |
450 psi* |
1109 |
2114 |
Piston weight |
33.0 lbs. |
33.0 lbs. |
500 psi* |
1258 |
2270 |
Stroke |
3.75" |
3.75" |
*Estimated value
**Blows per minute
|
Maximum pressure differential |
500 psig |
500 psig |
Make-up torque |
5000 ft-lb. |
5000 ft-lb. |
Operational Specifications |
Feed Force |
1500 - 2000 lbs. |
Rotation Speed |
50 - 80 rpm |
Secoroc QLX 50/55 Down the Hole Hammer

Ref. |
Part |
|
Ref. |
Part |
1 |
Exhaust tube |
13 |
O-ring* |
2 |
Chuck for QLX 50 / for QLX 55 |
14 |
Compression cone |
3 |
Bit retaining ring assembly |
15 |
Air distributor |
4 |
O-ring* (bit retainer) |
16 |
Plug, guide flow select |
5 |
O-ring* (bit bearing) |
17 |
Detent assembly |
6 |
Bit bearing |
17a |
Plunger* |
7 |
Lock ring |
17b |
Plunger spring* |
8 |
Casing for QLX 50 / for QLX 55 |
17c |
Plunger retainer plug* |
9 |
Piston |
18 |
Check valve spring |
10 |
Seal - piston tail bore |
19 |
Check valve |
11 |
Inner cylinder |
20 |
O-ring* (check valve) |
12 |
Valve assembly |
21 |
Choke plug solid |
12a |
O-ring* |
22 |
O-ring* |
12b
|
O-ring* |
23 |
Backhead assembly for QLX 50 / for QLX 55 |
*Not sold separately
**Item 21 - Choke plug 1/4" and choke plug 1/8" may be used to bypass more air to reduce pressure and/or
increase bailing velocity.
|
Wear Limits |
|
Hammers and Kits |
Chuck |
Min. length |
1.85" |
- QLX 50 Complete, 3 1/2" API Reg Pin
- QLX 55 Complete, 3 1/2" API Reg Pin
- E-kit QLX 50, 3 1/2" API Reg Pin
- E-kit QLX 55, 3 1/2" API Reg Pin
- O-ring kit includes items 2x4, 1x5, 1x22
- Sustainability kit includes O-ring kit and items 10, 12, 2x13, 20
|
Casing reverse QLX 50 |
Min. OD |
4.65" |
Casing reverse QLX 55 |
Min. OD |
4.84" |
Casing discard QLX 50/55 |
Min. OD |
4.38" |
Bit bearing |
Max. ID |
3.019" |
Piston/Casing clearance |
Max. |
0.01" |
Piston/Inner cylinder clearance |
Max. |
0.009" |
Exhaust tube protrusion |
Max. |
2.07" |
|