You demand.
We Supply.

TJM Drilling Equipment & Supplies is backed by over fifty years experience in sales and servicing in the water well, quarry, aggregate, dimensional stone, construction and mining drilling industries. In addition TJM has hands on field experience and knowledge to understand the true needs and urgency their customers require. TJM Drilling Equipment & Supplies is the exclusive dealer for HD Engineering hydraulic crawler drill rigs. TJM is also direct distributors for grout plants, air compressors, caisson drill rigs, blast hole drill rigs, onsite drill cuttings bioremediation equipment and solids control systems. In addition to equipment, TJM offers DTH hammers & bits, top hammer drill rods & bits, casing and anything needed for your company to complete your job effectively. Making TJM your one stop shop with the finest products in the industry with a devoted staff committed to excellence.

4HR

DOWN HOLE HAMMERS

SPECS

DescriptionEnglishMetric
Outside Diameter3.82″97mm
Minimum Bit Size4.33″110mm
Spanner Flat Size2.5″64mm
Length (Less Bit)37.6″956mm
Bit Shank TypeDHD340ADHD340A
Backhead Thread23/8” API Reg Pin23/8” API Reg Pin
Piston Weight16.3lbs7.4kg
Wear Sleeve Discard Limit3.425″87mm