Halco Rock Tools, UK Manufacturer of DTH Hammers and Bits. Halco pioneered the development and distribution of DTH hammers in the 1950s.
The GP600 is a high performance hammer which can drill under a head of water, so it is typically suitable for Waterwell and Geothermal applications due to its robust non-ported piston design.
 
A choke facility helps to adjust air flow through the hammer.
 
Choke system to allow adjustment of air flow to improve flushing.
3/16" Plug
Optimised drive chamber capacities to maximise hammer peformance
1/8" Plug
Blank
Plug
Robust piston design for optimum strength and perfomance.
12 spline QL60 shank reduces contact stress and wear rates.
Air Consumption 
Size
152 - 203mm
(6 1/8 - 8")
Shank
QL60
Air Pressure
100-435 PSI
(7-30 bar)
Tech Specs
Overview
GP600
Hammer Type
Part Number
Shank
Top Thread
Hammer Flat Size
Weight
Outside Diameter
Make Up Length
Recommended Maximum Thrust
600427
QL60
3 1/2" API Reg Pin
101mm (3.976") 
86Kg
140mm (5.512")
1035mm (40.754")
1500Kg (3300 lbs)
Drill Bit Overview
QL60
Part
Number
650094
653139
653028
653352
653160
653118
653369
653128
653227
653142
 
Diameter
Weight
(Kg)
23.2
24.4
23.85
23.9
25.3
25.1
25.35
26.2
31.7
34.1
 
Face
Buttons
Oversize
 
 
 
 
 
 
 
 
Y
Y
Y
mm
152
165
165
165
171
171
171
178
190
203
 
Inch
6 1/8
6 1/2
6 1/2
6 1/2
6 3/4
6 3/4
6 3/4
7 1/2
Design
Concave
Concave
Convex
Flat
Convex
Concave
Convex
Concave
Concave
Concave
 
Type
Dome
Dome 
Dome
Dome
Dome
Dome
Dome
Dome
Dome
Dome
 
Qty & Dia
20 x 16mm
18 x 16mm
20 x 16mm
22 x 18mm 
19 x 18mm
18 x 16mm
9 x 13mm / 19 x 18mm
8 x 20mm / 11 x 16mm
24 x 16mm
31 x 16mm
Additional bit configurations are available on request.