4" DTH Hammer - VD40D x 98

4" High Pressure DTH Hammer - VD40D x 98

The VD40D x 98 is a 4 inch high pressure down the hole hammer built by Vikay Mining Equipments in India. It has a 98 mm outer diameter, weighs 38 kg over a 1,000 mm length, and uses the DHD 340 bit shank with a 2 3/8 inch API regular pin coupler. It takes bits from 4 1/2 to 6 1/2 inch and runs on 350 to 940 cfm at 150 to 350 psi. No foot valve is required. Used in mining, construction, exploration, water well and geothermal drilling.

Technical Details  

VD40D x 98 DTH Hammer FAQs

Will the VD40D x 98 fit my drill string?

The VD40D x 98 uses a 2 3/8" API coupler thread, so it fits any string cut to that thread. Check the thread on the string already in use before ordering, because that is what decides it rather than the hammer size.

What hole will the VD40D x 98 drill?

The VD40D x 98 is 98 mm across, 1,000 mm long and 38 kg. It is a 4 inch hammer, so it is matched to a 4 inch hole and fitted with a bit of that size.

Which size of DTH hammer do I need?

This page is the VD40D x 98, the 4 inch hammer, 98 mm across and 38 kg. The size is the hole. Vikay manufactures 4 inch, 5 inch, 6 inch, 8 inch and 10 inch down the hammers, and the hammer is chosen to match the hole diameter being drilled, then fitted with a bit of that size. The larger hammers need proportionally more air, so the compressor on site is the practical limit on how big a hole can be drilled.

See also: VD50S x 106, VD55S x 112, VD60D x 148

What air pressure does the VD40D x 98 need?

The VD40D x 98 works at 150 to 350 psi. Down the hole drilling is volume hungry, so on most sites it is the compressor that limits the hole, not the hammer.