Mincon MR120-LA RC Hammer (4″ Metzke)

The MR range of RC hammers is designed to perform at the top end of the performance scale compared to other tools on the market. With extensive testing over an 18 months period the MR range of tools offers some very significant benefits over it’s predecessor, the MX range of RC hammers.
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Performance improvements show up to 20% increase in production in both grade control and exploration applications vs. the Mincon MX range. As with all Mincon hammers the tools performed extremely well in deep hole drilling in dry applications and where there is a lot of water in the bore hole. With a variable length available on the chuck sleeve the hammer can be easily set up for either dry or wet hole drilling. Set to become the standard by which RC hammers will be measured, the Mincon MR range of tools get the job done.

Key Features and Benefits

  • Patented mounting system for fixed internal components.
  • An extremely sturdy shank with a short length allows for greater transfer of energy between the piston and bit.
  • Variable chuck sleeve lengths for varying drilling conditions.
  • Single piece sample tube assembly.
  • Specially heat treated sample tubes offer superior wear resistance vs. our competitors.
  • Variable sample tube bore sizes allows the contractor greater flexibility in setting up his tool.
  • Hardened wear sleeve for optimum wear resistance even in the most abrasive conditions.
  • Multi-start threads on backhead and chuck ensure easy coupling/uncoupling of hammer.
  • Metal sprayed chuck sleeve and wear sleeve options for greater wear resistance on outside circulation.
  • All critical internal components are heat treated under strict control to maximize tool longevity.
  • Ease of service with no special assembly or disassembly tools required.

For more information:

+40 314 253 800
info@romned.ro

Ron van Dam
CEO

SpecificationsMetricImperial
Hammer Outside Diameter120mm4.75″
Hammer Length (Less Drill Bit)1165mm45.9″
Backhead Spanner Flat Size94mm4″
Drill Bit Shank TypeMR120
Backhead Thread4″ Metzke
Drill Bit Size Range127mm – 143mm5″ – 5.625″
Hammer Weight (Less Bit)70 Kgs154 Lbs
Maximum Drill Bit Weight14.5 Kgs32 Lbs
Piston Weight16 Kgs35.3 Lbs
Make up Torque4826-6440 NM3560-4750 FT Lbs
Backhead Stand Off0.75mm0.030″
Recommended Minimum Air Package25.5m3/min @ 24.1Bar900cfm @ 350psi
ItemPart NoDescription
MR120AL02MR120 Hammer 4″ Metzke – Low Air
11300-0780Internal Circlip
2MX5053AT11Adaptor Tube 4 Metzke
3BS-224O Ring x 2
4BS-040O Ring
5MX5053SC01Air Screen
6MR120BH11Back Head 4″ Metzke
7BS-241O Ring
88406-175Check Valve Seal – Nitrile U
9MR120CV01Check Valve Plunger
10MR120SP01Check Valve Spring
11MR120SS01Spacer
12MX4550LR01Lock Ring
13MR120ST01Sample Tube – Large Bore
MR120ST03Sample Tube – Small bore
14BS 228O Ring
15MR120DR02Sample Tube Mount
16BS 234O Ring
17BS 040O Ring
18MX5053SR01Seating Ring
19MR120IC01Inner Cylinder
20MR120PN01Piston
21MR120WS01Wear Sleeve
22MX5053PR01Piston Retaining Ring
23MR120BB01Aligner Bearing Bush
24N7-92×4O Ring x 2
25BS 237O Ring
26MR120BR01Bit Ring
27BS 152O Ring
28MR120CK01Chuck
29MR120CSxxxLMR120CSxxxLChuck Sleeve
MR120OKITO Ring Kit
MR120MK01Make up kit

 Air Pressures are given for compressors operating at seal level at 20° C (68º F). Corrections to actual compressor volume should be made to account for temperature, altitude and relative humidity.

DTH hammers must receive a constant supply of proper rock drill oil to protect the internal components and to provide a good air seal between the hammer’s running surfaces for efficient drilling. Mincon recommends the use of Mincon Envirosafe® Rock Drill Oil (RDO) to maintain optimal performance and extend the life of the internal components. The correct consumption of oil is dependent upon the air volume and conditions. Please refer to the lubrication graph below for recommendations. When drilling in wet conditions the normal amount should be doubled. There should be visual evidence of oil around the drill bit shank and within the tube joints when changing tubes.

If using petroleum based rock drill oils, the recommended grade of oil is dependent on the ambient temperature and the operating pressure. As a rule of thumb, ISO320 grade rock drill oil should be used whenever possible as the hammer is a high frequency tool, however, where the pump cannot pump the oil in colder conditions, a lower grade of oil can be used as per the graph below.

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DiameterFace TypePart NumberDescriptionNo. x Button Dia (inch)Sample holesWeight Approx.
mminchOuterFaceCentreKgs.Lbs.
1275Drop Centre5120127D1MR120 5″ DC BIT8 * 5/84 * 9/163 * 1/221533.1
1275Hard Formation5120127H1MR120 5″ HF BIT8 * 5/86 * 9/163 * 1/221533.1
1305 1/8Concave5120130C1MR120 5 1/8 CC BIT8 * 5/84 * 9/164 * 1/221533.1
1305 1/8Drop Centre5120130D2MR120 5 1/8 DEEP DC BIT8 * 5/84 * 9/163 * 1/221533.1
1305 1/8Hard Formation5120130H1MR120 5 1/8 HF BIT8 * 5/86 * 9/163 * 1/221533.1
1335 1/4Concave5120133C1MR120 5 1/4 CC BIT8 * 5/84 * 5/84 * 1/221533.1
1335 1/4Drop Centre5120133D2MR120 5 1/4 DEEP DC BIT8 * 5/84 * 9/163 * 1/221533.1
1335 1/4Hard Formation5120133H1MR120 5 1/4 HF BIT8 * 5/86 * 9/164 * 1/221533.1
1375 3/8Concave5120137C1MR120 5 3/8 CC BIT8 * 5/84 * 5/84 * 1/221533.1
1375 3/8Drop Centre5120137D2MR120 5 3/8 DEEP DC BIT8 * 5/84 * 5/83 * 1/221533.1
1375 3/8Hard Formation5120137H1MR120 5 3/8 HF BIT8 * 5/86 * 5/83 * 1/221533.1
1405 1/2Concave5120140C1MR120 5 1/2 CC BIT8 * 5/84 * 5/84 * 1/221533.1
1405 1/2Drop Centre5120140D2MR120 5 1/2 DEEP DC BIT8 * 5/84 * 5/83 * 1/221533.1
1405 1/2Hard Formation5120140H1MR120 5 1/2 HF BIT8 * 5/86 * 5/84 * 1/221533.1
1435 5/8Drop Centre5120143D2MR120 5 5/8 DEEP DC BIT8 * 5/84 * 5/83 * 1/221533.1
1435 5/8Hard Formation5120143H1MR120 5 5/8 HF BIT8 * 5/86 * 5/84 * 1/221533.1
1526Drop Centre5120152C1MR120 6″ COLLARING BIT8 * 5/86 * 9/164 * 1/221635.3
1656 1/2Drop Centre5120165C1MR120 6 1/2 COLLARING BIT8 * 5/88 * 9/164 * 9/1621839.7
1907 1/2Drop Centre5120190C1MR120 7 1/2 COLLARING BIT8 * 5/812 * 5/84 * 6/1622146.3