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Secoroc QLX 50/55 Down the Hole Hammer

QLX 50/55 - The Latest in High Performance DTH Hammers

Secoroc QLX 50/55 hammer 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 cutaway

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

QLX 50/55 Down the Hole Hammer part breakdown

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"