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A-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
WLA 1.880~1.870 47.75~47.50 1.607~1.057 27.10~26.85
WLA-RSG 1.895~1.885 48.13~47.88 1.607~1.057 27.10~26.85
AQ 1.880~1.870 47.75~47.50 1.607~1.057 27.10~26.85
AQ-RSG 1.895~1.885 48.13~47.88 1.067~1.057 27.10~26.85
AWG / AX 1.880~1.870 47.75~47.50 1.190~1.180 30.23~29.97
AWM 1.880~1.870 47.75~47.50 1.190~1.180 30.23~29.97
AWT 1.880~1.870 47.75~47.50 1.286~1.276 32.66~32.41
LTK48 1.880~1.870 47.75~47.50 1.394~1.384 35.40~35.15
B-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
WLB 2.350~2.340 56.69~59.44 1.438~1.428 36.52~36.27
WLB-RSG 2.365~2.355 60.07~59.82 1.438~1.428 36.52~36.27
WLB-2.400 2.045~2.395 61.09~60.83 1.438~1.428 36.52~36.27
WLB3 2.350~2.340 56.69~59.44 1.325~1.315 33.65~33.40
BQ 2.350~2.340 56.69~59.44 1.438~1.428 36.52~36.27
BQ-RSG 2.365~2.355 60.07~59.82 1.438~1.428 36.52~36.27
BQ-2.400 2.045~2.395 61.09~60.83 1.438~1.428 36.52~36.27
BQ3 2.350~2.340 56.69~59.44 1.325~1.315 33.65~33.40
BWG / BX 2.350~2.340 56.69~59.44 1.660~1.650 42.16~41.91
BWM 2.350~2.340 56.69~59.44 1.660~1.650 42.16~41.91
BWT 2.350~2.340 56.69~59.44 1.755~1.745 44.58~44.32
LTK60 2.350~2.340 56.69~59.44 1.742~1.732 44.25~44.00
TBW 2.350~2.340 56.69~59.44 1.785~1.775 45.34~45.09
   
N-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
WLN 2.970~2.960 75.44~75.19 1.880~1.870 47.75~47.50
WLN-RSG 2.985~2.975 75.82~75.57 1.880~1.870 47.75~47.50
WLN-3.032 3.037~3.027 77.14~76.89 1.880~1.870 47.75~47.50
WLN2 2.970~2.960 75.44~75.19 2.000~1.990 50.80~50.55
WLN2-RSG 2.985~2.975 75.82~75.57 2.000~1.990 50.80~50.55
WLN3/NWLTT 2.970~2.960 75.44~75.19 1.780~1.770 45.21~44.96
WLN3-RSG 2.985~2.975 75.82~75.57 1.780~1.770 45.21~44.96
WLN3-3.032 3.037~3.027 77.14~76.89 1.780~1.770 45.21~44.96
NQ 2.970~2.960 75.44~75.19 1.880~1.870 47.75~47.50
NQ-RSG 2.985~2.975 75.82~75.57 1.880~1.870 47.75~47.50
NQ-3.032 3.037~3.027 77.14~76.89 1.880~1.870 47.75~47.50
NQ2 2.970~2.960 75.44~75.19 2.000~1.990 50.80~50.55
NQ2-RSG 2.985~2.975 75.82~75.57 2.000~1.990 50.80~50.55
NQ3 / NQTT 2.970~2.960 75.44~75.19 1.780~1.770 45.21~44.96
NQ3-RSG 2.985~2.975 75.82~75.57 1.780~1.770 45.21~44.96
NQ3-3.032 3.037~3.027 77.14~76.89 1.780~1.770 45.21~44.96
NMLC 2.970~2.960 75.44~75.19 2.052~2.042 52.12~51.87
NWG / NX 2.970~2.960 75.44~75.19 2.160~2.150 54.86~54.61
NWM 2.970~2.960 75.44~75.19 2.160~2.150 54.86~54.61
NWT 2.970~2.960 75.44~75.19 2.318~2.308 58.87~58.62
TNW 2.970~2.960 75.44~75.19 2.394~2.384 60.80~60.55
H-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
WLH 3.770~3.755 95.76~95.38 2.505~2.495 63.63~63.38
WLH-RSG 3.790~3.755 96.27~95.89 2.505~2.495 63.63~63.38
WLH-3.830 3.840~3.825 97.54~97.16 2.505~2.495 63.63~63.38
WLH-3.895 3.897~3.882 98.98~98.60 2.505~2.495 63.63~63.38
WLH3/WLHTT 3.770~3.755 95.76~95.38 2.411~2.401 61.24~60.99
WLH3-RSG 3.790~3.755 96.27~95.89 2.411~2.401 61.24~60.99
WLH3-3.830 3.840~3.825 97.54~97.16 2.411~2.401 61.24~60.99
WLH3-3.895 3.897~3.882 98.98~98.60 2.411~2.401 61.24~60.99
HQ 3.770~3.755 95.76~95.38 2.505~2.495 63.63~63.38
HQ-RSG 3.790~3.755 96.27~95.89 2.505~2.495 63.63~63.38
HQ-3.830 3.840~3.825 97.54~97.16 2.505~2.495 63.63~63.38
HQ-3.895 3.897~3.882 98.98~98.60 2.505~2.495 63.63~63.38
HQ3/HQTT 3.770~3.755 95.76~95.38 2.411~2.401 61.24~60.99
HQ3-RSG 3.790~3.755 96.27~95.89 2.411~2.401 61.24~60.99
HQ3-3.830 3.840~3.825 97.54~97.16 2.411~2.401 61.24~60.99
HQ3-3.895 3.897~3.882 98.98~98.60 2.411~2.401 61.24~60.99
HMLC 3.897~3.882 98.98~98.60 2.505~2.495 63.63~63.38
HWF-long 3.912~3.897 99.36~98.98 3.005~2.995 76.33~76.08
HWF-short 3.897~3.882 98.98~98.60 3.005~2.995 76.33~76.08
HWG / HX 3.897~3.882 98.98~98.60 3.005~2.995 76.33~76.08
HWM 3.897~3.882 98.98~98.60 3.005~2.995 76.33~76.08
HWT 3.897~3.882 98.98~98.60 3.192~3.182 81.08~80.82
   
P-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
WLP 4.815~4.795 122.30~121.8 3.350~3.340 85.09~84.84
WLP3 4.815~4.795 122.30~121.8 3.275~3.265 83.18~82.93
PQ 4.815~4.795 122.30~121.8 3.350~3.340 85.09~84.84
PQ3 4.815~4.795 122.30~121.8 3.275~3.265 83.18~82.93
PWF-long 4.755~4.740 120.78~120.4 3.635~3.620 92.33~91.95
PWF-short 4.735~4.715 120.27~119.7 3.635~3.620 92.33~91.95
S-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
SWF-long 5.755~5.740 146.18~145.8 4.447~4.432 112.95~112.5
SWF-short 5.735~5.715 145.67~145.1 4.447~4.432 112.95~112.5
   
U-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
UWF-long 6.880~6.860 174.75~174.2 5.515~5.495 140.08~139.5
UWF-short 6.855~6.825 174.12~173.3 5.515~5.495 140.08~139.5
Z-Gauge core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
ZWF-long 7.880~7.860 200.15~199.6 6.515~6.495 165.48~164.9
ZWF-short 7.855~7.825 199.52~198.7 6.515~6.495 165.48~164.9
   
T, TT, T2, TB series Metric core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
T36 1.422~1.412 36.12~35.87 0.859~0.849 21.82~21.57
TT46 1.818~1.808 46.18~45.92 1.394~1.384 35.40~35.15
T2-46 1.818~1.808 46.18~45.92 1.253~1.243 31.82~31.57
TB56 2.220 56.3 1.64 41.7
TT56 2.210~2.200 56.13~55.88 1.788~1.778 45.41~45.16
T2-56 2.210~2.200 56.13~55.88 1.647~1.637 41.83~41.58
T2-66 2.603~2.593 66.12~65.87 2.040~2.030 51.81~51.56
T2-76 2.997~2.987 76.12~75.87 2.434~2.424 61.82~61.57
T2-76 coreline 2.997~2.987 76.12~75.87 2.288~2.278 58.12~57.87
T2-86 3.391~3.381 86.13~85.88 2.828~2.818 71.83~71.58
T2-86 coreline 3.391~3.381 86.13~85.88 2.682~2.672 68.13~67.88
T2-101 3.981~3.971 101.12~100.8 3.300~3.290 83.82~83.57
T2-101 coreline 3.981~3.971 101.12~100.8 3.155~3.145 80.13~79.88
T6 series Metric core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
T6-76 2.997~2.987 76.12~75.87 2.249~2.239 57.12~56.87
T6-86 3.391~3.381 86.13~85.88 2.643~2.633 67.13~66.88
T6-101 3.981~3.971 101.12~100.87 3.115~3.105 79.12~78.87
T6-116 4.575~4.560 116.20~115.82 3.667~3.657 93.14~92.89
T6-131 5.165~5.150 131.19~130.81 4.257~4.247 108.13~107.88
T6-146 5.755~5.740 146.18~145.8 4.847~4.837 123.11~122.86
   
B series (ISO3552-1) Metric core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
B36 1.422~1.412 36.12~35.87 0.859~0.849 21.82~21.57
B46 1.818~1.808 46.18~45.92 1.253~1.243 31.82~31.57
B56 2.210~2.200 56.13~55.88 1.647~1.637 41.83~41.58
B66 2.603~2.593 66.12~65.87 2.040~2.030 51.81~51.56
B76 2.997~2.987 76.12~75.87 2.434~2.424 61.82~61.57
B86 3.391~3.381 86.13~85.88 2.828~2.818 71.83~71.58
B101 3.981~3.971 101.12~100.87 3.418~3.408 86.62~86.57
B116 4.575~4.560 116.20~115.82 4.009~3.999 101.83~101.58
B131 5.165~5.150 131.19~130.81 4.599~4.589 116.82~116.57
B146 5.755~5.740 146.18~145.80 5.190~5.180 131.82~131.57
T6S series Metric core bits
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
T6S-76 3.009~2.999 76.43~76.18 1.883~1.873 47.83~47.58
T6S-86 3.403~3.393 86.43~86.18 2.277~2.267 57.83~57.58
T6S-101 3.993~3.983 101.43~101.18 2.828~2.818 71.83~71.58
T6S-116 4.586~4.571 116.48~116.1 3.379~3.369 85.83~85.58
T6S-131 5.177~5.162 131.48~131.1 3.970~3.960 100.83~100.58
T6S-146 5.767~5.752 146.48~146.1 4.560~4.550 115.83~115.58
   
Chinese standard Metric core bits for single tube core barrels
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
36   36.2   21.5
46   46.2   29.1
56   56.2   39.1
59   59.5   41.5
75   75.2   54.5
91   91.2   68
110   111.2   93
130   131.2   113
150   151.2   133
170   171.2   149
219   225.2   197
275   278.2   249
Chinese standard Metric core bits for double tube core barrels
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
46   46.2   29.1
56   56.2   39.1
59   59.5   41.5
75   75.2   54.5
91   91.2   68

Chinese standard Metric core bits for wireline core barrels
Size OD (outer diameter) ID (inside diameter)
Inch mm Inch mm
59   59.5   41.5
75   75.2   54.5
91   91.2   68
   
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