Halco Rock Tools, UK Manufacturer of DTH Hammers and Bits. Halco pioneered the development and distribution of DTH hammers in the 1950s.
Head Designs
Convex Face
 
Strong design for all conditions especially hard abrasive rock.
 
Good balance of fast drilling and long service life.
Flat Face
 
Alternative design for all rock conditions especially fractured and fissured rock and changing formations.
Concave
 
Alternative design for all rock conditions, particularly deep hole drilling can improve hole alignment as a result of inverted pilot.
Drill Bit Overview
SD12
Oversize
 
Part
Number
650383
653496
650988
653478
653494
650376
Weight
(Kg)
138
154.2
208
220
231
245
Diameter
Face
Buttons
mm
311
311
381
381
445
445
Inch
12 1/4
12 1/4
15
15
17 1/2
17 1/2
Design
Concave
Concave
Concave
Concave
Concave
Concave
Type
Dome
Dome
Dome
Dome
Dome
Dome
Qty & Dia
31 x 20mm
31 x 20mm
65 x 20mm / 18 x 16mm
17x 18mm / 48 x 20mm / 18 x 16mm
79 x 20mm
79 x 20mm
Additional bit configurations are available on request.