Mincon 8DH Hammer

The Mincon 8DH hammer is designed around proven technology to perform at the top end of the performance scale compared to other tools on the market. These tools are excellent for all types of drilling applications including residential geothermal, production quarry drilling, seismic drilling and small construction drilling.
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Key Features and Benefits

  • Patented features maximize energy output and reduce service requirements.
  • Fewer internal components minimize service requirements.
  • Valveless, high frequency design ensures smooth operation.
  • 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.
  • Unique internal mount system eliminates the need for wear shims and special assembly tools.
  • All critical internal components are heat treated under strict control to maximize tool longevity.

For more information:

+40 314 253 800
info@romned.ro

Ron van Dam
CEO

Specifications Metric Imperial
Hammer Outside Diameter 181mm 7.15″
Hammer Length (Less Bit, Backhead Shoulder to Chuck) 1186mm 46.7″
Backhead Spanner Flat Size 140mm 5.5″
Drill Bit Shank Type DHD380
Minimum Bit Size 203mm 8.0″
Hammer Weight (Less Bit) 173.2Kgs 381Lbs
Drill Bit Weight (216mm/8 1/2″) 52.2Kgs 115Lbs
Piston Weight 39Kgs 86Lbs
Backhead Stand Off 0.75mm 0.030″
Make up Torque 8135-10850 NM 6000-8000 FT Lbs
Wear Sleeve Reverse Limit 172mm 6.770″
Wear Sleeve Discard Limit 169mm 6.650″
Recommended Minimum Air Package 425 l/s @ 24.1 Bar 900 cfm @ 350 psi
Item # Part Number Description
MD801AS01 Mincon 8DH (4 1/2″ A.P.I. Reg. Pin)
1 MD801BH01 Backhead (4 1/2″ A.P.I. Reg. Pin)
2 MD822OR01 O Ring
3 MB506CH01 Choke Blank
4 MD802CV01 Check Valve
5 MB503SP01 Spring
6 MD805LR01 Lock Ring
7 MD804SM01 Steel Make-Up Ring
8 MD807DR01 Air Distributor
9 MD821OR01 O Ring
10 MD820OR01 O Ring
11 MD809SR01 Seating Ring
12 MD808IC01 Inner Cylinder
13 MD810PN01 Piston
14 MD811WS01 Wear Sleeve
15 MD812PR01 Piston Retaining Ring
16 MD814BR01 Bit Retaining Ring
17 MD821OR01 O Ring
18 MD815CK01 Chuck (DHD380)
19 MD826SK01 Service Kit
MD826SK01 Service Kit
3 MB506CH01 Choke Blank
MB506CH02 Choke 1/8″ (3.2mm)
MB506CH03 Choke 3/16″ (4.8mm)
5 MB503SP01 Spring
MD825OK01 O Ring Kit
MD825OK01 O Ring Kit
2 MD822OR01 O Ring
9 MD821OR01 O Ring
10 MD820OR01 O Ring
17 MD821OR01 O Ring

8 0 8DH AC 

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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Note: The Part Numbers below require the Carbide Insert type code to be added on the end to complete them. For a combination of carbide inserts use the gauge row code first and then the face code.

Diameter Face Type Part Number No. x Button Dia (inch) Flushing holes Weight Approx.
mm inch Outer Inner Front Kgs. Lbs.
200 7 7/8″ Concave 77I380C30 10 – 3/4″ 6 – 3/4″ 7 – 3/4″ 2 49 108
203 8″ Flat 80I380F30 10 – 3/4″ 4 – 3/4″ 8 – 5/8″ 2 49 108
203 8″ Concave 80I380C30 10 – 3/4″ 6 – 3/4″ 4-3/4″ / 4-5/8″ 2 49 108
203 8″ Concave 80I380C39 9 – 3/4″ 6 – 3/4″ 6 – 3/4″ 3 49 108
203 8″ Convex 80I380V39 9 – 3/4″ 6 – 3/4″ 6 – 3/4″ 3 49 108
210 8 1/4″ Concave 82I380C30 10 – 3/4″ 4 – 3/4″ 4-3/4″ / 4-5/8″ 2 50.8 112
210 8 1/4″ Concave 82I380C39 9 – 3/4″ 6 – 3/4″ 6 – 3/4″ 3 50.8 112
216 8 ½” Concave 84I380C332 12 – 3/4″ 8 – 3/4″ 8 – 3/4″ 3 52.2 115
216 8 ½” Flat 84I380F30 10 – 3/4″ 8 – 3/4″ 8 – 3/4″ 2 52.2 115
219 8 5/8″ Concave 85I380C30 10 – 3/4″ 6 – 3/4″ 4-3/4″ / 6-5/8″ 2 52.7 116
222 8 ¾” Concave 86I380C333 10 – 3/4″ 8 – 3/4″ 8 – 3/4″ 2 53.6 118
225 8 7/8″ Concave 87I380C32D 12 – 3/4″ 6 – 3/4″ 8 – 3/4″ 2 54.9 121
225 8 7/8″ Convex 87I380V30 10 – 3/4″ 6 – 3/4″ 10 – 3/4″ 2 54.9 121
229 9″ Concave 90I380C32 12 – 3/4″ 9 – 3/4″ 9 – 3/4″ 3 53.6 118
235 9 1/4″ Concave 92I380C30 10 – 3/4″ 6 – 3/4″ 4-3/4″ / 6-5/8″ 2 56.3 124
235 9 1/4″ Concave 92I380C32 12 – 3/4″ 9 – 3/4″ 9 – 3/4″ 3 56.3 124
241 9 ½” Concave 94I380C32 12 – 3/4″ 9 – 3/4″ 13 – 3/4″ 3 59.5 131
241 9 1/2″ Convex 94I380V32 12 – 3/4″ 9 – 3/4″ 14 – 3/4″ 3 59.5 131
248 9 3/4″ Concave 96I380C30 10 – 3/4″ 6 – 3/4″ 4-3/4″ / 6-5/8″ 2 62.2 137
248 9 3/4″ Concave 96I380C32 12 – 3/4″ 6 – 3/4″ 13 – 3/4″ 3 62.2 137
251 9 7/8″ Concave 97I380C332 12 – 3/4″ 9 – 3/4″ 13 – 3/4″ 3 64.9 143
254 10″ Concave 10I380C332 12 – 3/4″ 9 – 3/4″ 13 – 3/4″ 3 65.8 145
254 10″ Flat 10I380F32 12 – 3/4″ 6 – 3/4″ 13 – 3/4″ 3 65.8 145
260 10 1/4″ Concave 102I380C30 10 – 3/4″ 6 – 3/4″ 4-3/4″ / 6-5/8″ 2 67.6 149
260 10 1/2″ Concave 104I380C30 10 – 3/4″ 6 – 3/4″ 6-3/4″ / 6-5/8″ 2 69 152
270 10 5/8″ Concave 105I380C32 12 – 3/4″ 9 – 3/4″ 14 – 3/4″ 3 69.5 153
273 10.75 Concave 106I380C30 10 – 3/4″ 6 – 3/4″ 8-3/4″ / 6-5/8″ 2 70.4 155
279 11″ Concave 11I380C332 12 – 3/4″ 6 – 3/4″ 15 – 3/4″ 3 71.7 158
286 11 1/4″ Concave 112I380C32 12 – 3/4″ 6 – 3/4″ 15 – 3/4″ 3 73.1 161
292 11 ½” Concave 114I380C32 12 – 3/4″ 6 – 3/4″ 19 – 3/4″ 3 74.9 165
298 11 3/4 Concave 116I380C32 12 – 3/4″ 6 – 3/4″ 19 – 3/4″ 3 75.8 167
302 11 7/8″ Concave 117I380C32 12 – 3/4″ 6 – 3/4″ 19 – 3/4″ 3 77.2 170
305 12″ Concave 12I380C32 12 – 3/4″ 6 – 3/4″ 19 – 3/4″ 3 79 174
311 12 1/4″ Concave 122I380C32 12 – 3/4″ 6 – 3/4″ 19 – 3/4″ 3 80.4 177