4 Inch DTH Hammers

4HRSD_Overview 4HRTD_OverviewThe Mincon range of 4” DTH hammers 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.

The Mincon range of 4” hammers are available in the popular DHD 340A shank, the SD4 shank and a Mincon designed heavy duty shank for operation at higher pressures.

  • 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.


Imperial Specifications

Mincon 4HDS Mincon 4HR Mincon 4HRSD Mincon 4HRTD
Hammer Outside Diameter 3.82″ 3.82″ 3.82″ 3.82″
Hammer Length (Less Drill Bit) 37.6″ 37.6″ 37.6″ 37.6″
Backhead Spanner Flat Size 2.5″ 2.5″ 2.5″ 2.5″
Drill Bit Shank Type MD4 DHD 340A SD4/3415 TD40
Standard Backhead Thread¹ 2-3/8″ A.P.I. Reg Pin 2-3/8″ A.P.I. Reg Pin 2-3/8″ A.P.I. Reg Pin 2-3/8″ A.P.I. Reg Pin
Minimum Bit Size 4.33″ 4.33″ 4.33″ 4.33″
Hammer Weight (Less Bit) 85lbs 85lbs 85lbs 85lbs
Drill Bit Weight 19lbs 35lbs 39lbs 44lbs
Piston Weight 17lbs 17lbs 17lbs 17lbs
Backhead Stand Off 0.030″ 0.030″ 0.030″ 0.030″
Recommended Minimum Air Package² 250cfm @ 150psi 250cfm @ 150psi 250cfm @ 150psi 250cfm @ 150psi

¹ Other Backhead threads available upon request

² Drilling conditions and project specifications may require larger air package to be used