Mincon MR109 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.

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

Ron van Dam

Hammer Outside Diameter109mm4.29″
Hammer Length (Less Drill Bit)1250mm49.2″
Backhead Spanner Flat Size94mm3.7″
Drill Bit Shank TypeMR109
Backhead Thread4″ Metzke
Drill Bit Size Range114mm – 121mm4.5″ – 4.75″
Hammer Weight (Less Bit)65 Kgs143 Lbs
Maximum Drill Bit Weight13 Kgs28.6 Lbs
Piston Weight12 Kgs26.4 Lbs
Make up Torque4373-5830 NM3225-4300 FT Lbs
Backhead Stand Off0.75mm0.030″
Recommended Minimum Air Package25.5m3/min @ 24.1Bar900cfm @ 350psi
ItemPart NumberDescription
MR109AS02Mincon MR109 (4″ Metzke)
11300-0780Internal Circlip
2MX5053AT11Adaptor Tube 4″ Metzke
3BS 224O Ring x 2
4BS 040O Ring
6MX4550BH11Backhead 4″ Metzke
7BS 238O Ring
88406-175Check Valve Seal
9MX5053CV01Check Valve Plunger
10MX5053SP04Check Valve Spring
11MX4550SM01Steel Make Up Ring
12MX4550LR01Lock Ring
14MX4550ST01Sample Tube – Large Bore
MX4550ST03Sample Tube – Small Bore
15BS 225O Ring
16MX4550DR01Sample Tube Mount
17BS 231O Ring x 2
18BS 040O Ring
19MX4550SR01Seating Ring
20MX4550IC01Inner Cylinder
22MR109WS01Wear Sleeve
23MX4550PR01Piston Retain Ring
24BS 152O Ring x 2
25MR109BB01Aligner Bearing Bush
26MR109BR01MR109 Bit Retaining Ring
27BS 152O Ring
28MR109CSxxxLChuck Sleeve
29MR109CK01MR109 Chuck
MR109OKITMR109 O Ring Kit
MR109MK01MR109 Make Up Service 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.

DiameterFace TypePart NumberDescriptionNo. x Button Dia (inch)Sample holesWeight Approx.
1154 1/2Drop Centre5109115D1MR109 4 1/2 DC BIT8 * 9/164 * 1/22 * 1/2211.826.0
1184 5/8Drop Centre5109118D1MR109 4 5/8″ DC BIT8 * 9/164 * 1/22 * 1/2211.826.0
1214 3/4Drop Centre5109121D1MR109 4 3/4″ DC BIT8 * 9/164 * 9/162 * 1/2211.826.0
1244 7/8Hard Formation5109124H1MR109 4 7/8″ HF BIT8 * 9/166 * 9/162 * 1/2211.826.0
1275Hard Formation5109127H1MR109 5″ HF BIT8 * 9/166 * 9/162 * 1/2211.826.0
1526Drop Centre5109152C1MR109 6″ COLLARING BIT8 * 5/84 * 9/162 * 1/221635.3