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

Specifications Metric Imperial
Hammer Outside Diameter 109mm 4.29″
Hammer Length (Less Drill Bit) 1250mm 49.2″
Backhead Spanner Flat Size 94mm 3.7″
Drill Bit Shank Type MR109
Backhead Thread 4″ Metzke
Drill Bit Size Range 114mm – 121mm 4.5″ – 4.75″
Hammer Weight (Less Bit) 65 Kgs 143 Lbs
Maximum Drill Bit Weight 13 Kgs 28.6 Lbs
Piston Weight 12 Kgs 26.4 Lbs
Make up Torque 4373-5830 NM 3225-4300 FT Lbs
Backhead Stand Off 0.75mm 0.030″
Recommended Minimum Air Package 25.5m3/min @ 24.1Bar 900cfm @ 350psi
Item Part Number Description
MR109AS02 Mincon MR109 (4″ Metzke)
1 1300-0780 Internal Circlip
2 MX5053AT11 Adaptor Tube 4″ Metzke
3 BS 224 O Ring x 2
4 BS 040 O Ring
5 MX5053SC01 Airscreen
6 MX4550BH11 Backhead 4″ Metzke
7 BS 238 O Ring
8 8406-175 Check Valve Seal
9 MX5053CV01 Check Valve Plunger
10 MX5053SP04 Check Valve Spring
11 MX4550SM01 Steel Make Up Ring
12 MX4550LR01 Lock Ring
13 MX4550SS01 Spacer
14 MX4550ST01 Sample Tube – Large Bore
MX4550ST03 Sample Tube – Small Bore
15 BS 225 O Ring
16 MX4550DR01 Sample Tube Mount
17 BS 231 O Ring x 2
18 BS 040 O Ring
19 MX4550SR01 Seating Ring
20 MX4550IC01 Inner Cylinder
21 MX4550PN01 Piston
22 MR109WS01 Wear Sleeve
23 MX4550PR01 Piston Retain Ring
24 BS 152 O Ring x 2
25 MR109BB01 Aligner Bearing Bush
26 MR109BR01 MR109 Bit Retaining Ring
27 BS 152 O Ring
28 MR109CSxxxL Chuck Sleeve
29 MR109CK01 MR109 Chuck
MR109OKIT MR109 O Ring Kit
MR109MK01 MR109 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.

Diameter Face Type Part Number Description No. x Button Dia (inch) Sample holes Weight Approx.
mm inch Outer Face Centre Kgs. Lbs.
115 4 1/2 Drop Centre 5109115D1 MR109 4 1/2 DC BIT 8 * 9/16 4 * 1/2 2 * 1/2 2 11.8 26.0
118 4 5/8 Drop Centre 5109118D1 MR109 4 5/8″ DC BIT 8 * 9/16 4 * 1/2 2 * 1/2 2 11.8 26.0
121 4 3/4 Drop Centre 5109121D1 MR109 4 3/4″ DC BIT 8 * 9/16 4 * 9/16 2 * 1/2 2 11.8 26.0
124 4 7/8 Hard Formation 5109124H1 MR109 4 7/8″ HF BIT 8 * 9/16 6 * 9/16 2 * 1/2 2 11.8 26.0
127 5 Hard Formation 5109127H1 MR109 5″ HF BIT 8 * 9/16 6 * 9/16 2 * 1/2 2 11.8 26.0
152 6 Drop Centre 5109152C1 MR109 6″ COLLARING BIT 8 * 5/8 4 * 9/16 2 * 1/2 2 16 35.3