Page 14 - Diamond Products Catalog

DIAMOND CORING DRILL BIT GAUGES
Compared to most core drilling systems, QTM systems provide maximum performance, balancing drilling fluid and cuttings management with reliable inner and outer tubes.
The Boart Longyear nomenclature and hole sizes are based on the globally accepted Diamond Core Drilling Manufacturers Association (DCDMA) “W" series. Also note that the DCDMA specifications were adopted into ISO3551 (1992) and British Standard BS4019 (1993) Rotary Drilling Equipment.
Size
Core Diameter
Bit OD Diameter STD
Bit OD Diameter RSG
Bit OD Diameter OS
Hole Volume
in
mm
in
mm
in
mm
in
mm
(gal/ 100 ft)
(L/ 100 m)
QTM Wireline
BQ
1.433
36.4
2.345
59.6
2.360
59.9
N/A
NA
22.7
282
NQ
1.875
47.6
2.965
75.3
2.980
75.7
3.032
77.0
36.3
451
HQ
2.500
63.5
3.763
95.6
3.782
96.1
3.830, 3.895
97.3, 98.9
58.3
724
PQ
3.345
85.0
4.805
122.0
4.827
122.6
4.950
125.7
95.1
1180
QTM Thin Kerf
AQTK
1.202
30.5
1.875
47.6
1.890
48.0
N/A
N/A
14.6
181
BQTK
1.601
40.7
2.345
59.6
2.360
59.9
N/A
N/A
22.7
282
NQTK*
1.995
50.7
2.965
75.3
2.980
75.7
3.032
77.0
36.3
451
QTM Triple Tube
NQ3, NQTT
1.775
45.1
2.965
75.3
2.980
75.7
3.032
77.0
36.3
451
HQ3, HQTT
2.406
61.1
3.763
95.6
3.782
96.1
3.830, 3.895
97.3, 98.9
58.3
724
PQ3, PQTT
3.270
83.1
4.805
122.0
4.827
122.6
4.950
125.7
95.1
1180
Conventional
LTK 48
1.390
35.3
1.875
47.6
1.890
48.0
N/A
N/A
14.6
282
LTK 60
1.732
44.0
2.345
59.6
2.360
59.9
N/A
N/A
22.7
451
All dimensions, weights, and volumes shown are nominal
12
© Copyright 2014 Boart Longyear. All rights reserved.
*NQTK also known as NQ2
Q is a trademark of Boart Longyear.