Introducing the TerraRox hammer series – starting with the GT4
TerraRox GT4 Hammer
Introducing the TerraRox hammer series – starting with the GT4
TerraRox GT4 Hammer
The shortest and lightest tubeless 4" geothermal hammer on the market.
Engineered for Nordic conditions. Made in Finland.
INNOVATIVE FEATURES. TUBELESS DESIGN. EASY TO HANDLE. MADE IN FINLAND. INNOVATIVE FEATURES. TUBELESS DESIGN. EASY TO HANDLE. MADE IN FINLAND.
REBUILD. PERFORM. REPEAT. REBUILD.
Why GT4?
The GT4 is the result of advanced engineering and real-world insight into what drilling contractors actually need: a hammer that drills fast, lasts long, and won’t let you down in the field.
Built on a proven, foot-valve-free tubeless TD40 principle, the GT4 eliminates one of the most common failure points in the industry – giving you greater reliability and easier maintenance from day one.
35 bar
Operating pressure
115 mm
4"
0 foot valves
Built for performance.
Designed for reliability.
The GT4 combines advanced engineering with real-world practicality – delivering a hammer that drills faster, lasts longer, and demands less maintenance.
Less downtime. More metres.
Eight reasons why the GT4 is the smart choice for geothermal drilling.
No foot valve
Tubeless TD40 design eliminates the most common failure point in DTH drilling, reducing downtime and maintenance stops in the field.
Shortest and lightest
Length-optimised components make the GT4 the shortest and lightest tubeless 4″ geothermal hammer on the market.
FEA-optimised impact
Rebuildable with Eco-kit
Extend the hammer’s working life cost-effectively. High efficiency is fully maintained even after a rebuild.
Universal compatibility
Compatible with all third-party TD40 bits. Optimised for the TerraRox X-Roc 115 mm – a perfect system match.
Nordic engineered
Developed and manufactured in Finland. Designed to match the most commonly used compressors across the Nordics at 35 bar.
– cleaner airflow, fewer moving parts, and more efficient energy transfer from
hammer to bit. Less wasted force, more rock broken per stroke.
Designed for quick and easy bit changes on site.
The tubeless TD40 design removes the foot valve from the equation
– delivering greater reliability and fewer unplanned stops.
Every millimetre of the piston geometry is optimised through Finite Element Analysis
– delivering maximum durability and seamless compatibility with all tubeless TD40 bits.
Premium materials and advanced heat
treatment extend component life
– so you can drill faster and
longer between service intervals.
Designed with tighter guiding surface clearances, the piston protects critical seals from wear maintaining efficiency throughout the hammer's entire lifetime.
Most hammers force a trade-off between backpressure resistance and parts alignment.
The GT4's innovative aligner flange eliminates that compromise
– delivering both, with less internal wear as a result.
Every component is length-optimised to keep the GT4 as
short and light as possible – because a hammer that's easy
to handle saves time on site.
Every component is
length-optimised to
keep the GT4 as
short and light as possible
– because a hammer
that's easy
to handle saves
time on site.
Most hammers
force a trade-off
between backpressure
resistance and parts
alignment. The GT4's
innovative aligner
flange eliminates
that compromise
– delivering both,
with less internal wear
as a result.
Designed with tighter
guiding surface clearances,
the piston protects critical
seals from wear – maintaining
efficiency throughout the
hammer's entire lifetime.
Premium materials and
advanced heat treatment
extend component life
– so you can drill faster
and longer between service
intervals.
Every millimetre of the
piston geometry is
optimised through
Finite Element Analysis
– delivering maximum
durability and seamless
compatibility with
all tubeless TD40 bits.
The tubeless TD40
design removes the
foot valve from
the equation
–
delivering greater
reliability and fewer
unplanned stops.
Designed for quick and
easy bit changes on site.
The GT4's tubeless
TD40 shank connects
directly to the
X-Roc with no foot
valve – cleaner airflow,
fewer moving parts,
and more efficient
energy transfer from
hammer to bit.
Less wasted force,
more rock broken
per stroke.
Technical specfications.
Operating pressure
35 bar
Hammer class
4″
Shank type
TD40 – Tubeless (no foot valve)
Connection thread
API 2 3/8″ Reg. Pin
Recommended bit
115 mm X-Roc
Application
Geothermal well drilling
Origin
Designed & manufactured in Finland
Operating pressure
35 bar
Hammer class
4″
Shank type
TD40 – Tubeless (no foot valve)
Connection thread
API 2 3/8″ Reg. Pin
Recommended bit
115 mm X-Roc
Application
Geothermal well drilling
Origin
Designed & manufactured in Finland
Eco-kit helps you rebuild, perform and repeat.
The GT4 is designed from the ground up to be rebuilt. The Eco-Kit is a cost-effective service kit that restores your hammer to full performance – no replacement needed.
A single Eco-Kit rebuild significantly extends the operational life of the hammer at a fraction of the cost of a new unit.
Innovative design features ensure precision alignment and minimal internal leakage are fully restored after rebuild.
Fewer replacements means less material waste – a more sustainable approach to drilling operations.
GT4 + X-Roc 115 mm
The GT4 is the result of advanced engineering and real-world insight into what drilling contractors actually need: a hammer that drills fast, lasts long, and won’t let you down in the field.
Built on a proven, foot-valve-free tubeless TD40 principle, the GT4 eliminates one of the most common failure points in the industry – giving you greater reliability and easier maintenance from day one.
Combine your GT4 hammer with our X-Roc drill bit. Our revolutionary 115mm DTH drill bit that drills faster, deeper, and with less bit wear than anything else on the market.
Interested in the
GT4 Hammer?
Interested in the
GT4 Hammer?
Fill in your details and one of our drilling specialists will get back to you.
