Boring Bars
Top Notch™ threading boring bars are a standout choice for internal threading operations. These boring bars are expertly designed to perform a variety of tasks including grooving, turning, chamfering, and profiling. What sets them apart is their adaptability to different applications, as they come in a range of pitches and bore diameters. Steel and carbide shanks with coolant capabilities are available.
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Filters
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Workpiece Material
Workpiece Material
- P Steel (63)
- P0Low-Carbon Steels, Long Chipping C < .25%; <125 HB; <530 N/mm^2 UTS(63)
- P1Low-Carbon Steels, Short Chipping C < .25%; <125 HB; <530 N/mm^2 UTS(63)
- P2Medium and High Carbon Steels C < .25%; <220 HB; <25 HRC; >530 N/mm^2 UTS(63)
- P3Alloy Steels & Tool Steels C > .25%; <330 HB; <35 HRC; 600-850 N/mm^2 UTS(63)
- P4Alloy Steels & Tool Steels C > .25%; 350-420 HB; 35-43 HRC; 850-1400 N/mm^2 UTS(63)
- P5Ferritic, Martensitic, and PH Stainless Steels <330 HB; <35 HRC; 600-900 N/mm^2 UTS(63)
- P6High Strength Ferritic, Martensitic, and PH Stainless Steels 350-450 HB; 35-43 HRC; 900-2400 N/mm^2 UTS(63)
- M Stainless Steel (63)
- M1Austenitic Stainless Steel 130-200 HB; <600 N/mm^2 UTS(63)
- M2High Strength Austenitic Stainless and Cast Stainless Steels 150-230 HB; <25 HRC; >600 N/mm^2 UTS(63)
- M3Duplex Stainless Steel 135-275 HB; <30 HRC; 500-1200 N/mm^2 UTS(63)
- K Cast Iron (63)
- K1Gray Cast Iron 120-290 HB; <32 HRC; 125-500 N/mm^2 UTS(63)
- K2Low and Medium Strength CGI and Ductile Irons 130-260 HB; <28 HRC; <600 N/mm^2 UTS(63)
- K3High Strength Ductile and Austempered Ductile Iron 180-350 HB; <43 HRC; >600 N/mm^2 UTS(63)
- N Non-Ferrous Materials (63)
- N1Wrought Aluminum (63)
- N2Low-Silicon Aluminum Alloys and Magnesium Alloys Si <12.2%(62)
- N3High-Silicon Aluminum Alloys Si >12.2%(18)
- N4Copper, Brass, Zinc-based on machinability index range of 70-100 (63)
- N5Nylon, Plastics, Rubbers, Phenolics, Resins, Fiberglass (62)
- N6Carbon, Graphite Composites, CFRP (62)
- S High-Temp Alloys (63)
- S1Iron-Based, Heat-Resistant Alloys 160-260 HB; 25-48 HRC; 500-1200 N/mm^2 UTS(63)
- S2Cobalt-Based, Heat-Resistant Alloys 250-450 HB; 25-48 HRC; 1000-1450 N/mm^2 UTS(63)
- S3Nickel-Based, Heat Resistant Alloys 160-450 HB; <48 HRC; 600-1700 N/mm^2 UTS(63)
- S4Titanium and Titanium Alloys 300-400 HB; 33-43 HRC; 900-1600 N/mm^2 UTS(63)
- H Hardened Materials (61)
- H1Hardened Materials 44-48 HRC(61)
- H2Hardened Materials 48-55 HRC(61)
- H3Hardened Materials 56-60 HRC(34)
- H4Hardened Materials >60 HRC(34)
Applications
Applications
Face Grooving (62)
Grooving (4)
ID Grooving (63)
ID Thread Turning (63)
Threading (2)
Type of Thread
Type of Thread
- 60 (61)
- ACME (28)
- API (26)
- API RD (20)
- BSW (18)
- BUTTRESS (53)
- M (30)
- NPT (18)
- STUB ACME (18)
- UN (53)
- UNJ (18)
Cutting Condition
Cutting Condition
- Heavily Interrupted Cut (62)
- Lightly Interrupted Cut (62)
- Smooth Cut (62)
Cutting Edges Per Insert
Cutting Edges Per Insert
- 1.0 (61)
- 2.0 (55)
to
Internal Coolant Capability
Internal Coolant Capability
Over All Length [L]
Over All Length [L]
- 4.921 in(1)
- 5.906 in(5)
- 5.996 in(1)
- 6.0 in(2)
- 7.079 in(2)
- 7.875 in(4)
- 7.931 in(1)
- 7.976 in(1)
- 8.0 in(6)
- 8.058 in(2)
- 8.082 in(1)
- 9.843 in(2)
- 9.879 in(1)
- 10.0 in(8)
- 11.811 in(4)
- 12.0 in(6)
- 13.781 in(1)
- 14.0 in(7)
- 16.0 in(8)
to
Over All Length [L]
Over All Length [L]
- 125.0 mm(1)
- 150.0 mm(5)
- 152.3 mm(1)
- 152.4 mm(2)
- 179.8 mm(2)
- 200.0 mm(4)
- 201.425 mm(1)
- 202.601 mm(1)
- 203.201 mm(6)
- 204.675 mm(2)
- 205.275 mm(1)
- 250.0 mm(2)
- 250.925 mm(1)
- 254.0 mm(8)
- 300.0 mm(4)
- 304.8 mm(6)
- 350.0 mm(1)
- 355.6 mm(7)
- 406.401 mm(8)
to
Corner Radius
Corner Radius
- 0.002 in(18)
- 0.003 in(61)
- 0.004 in(45)
- 0.005 in(18)
- 0.006 in(26)
- 0.007 in(38)
- 0.008 in(61)
- 0.01 in(38)
- 0.011 in(18)
- 0.012 in(18)
- 0.014 in(26)
- 0.016 in(20)
- 0.019 in(26)
- 0.02 in(45)
- 0.023 in(26)
- 0.03 in(27)
- 0.031 in(45)
- 0.033 in(2)
- 0.035 in(26)
- 0.039 in(45)
- 0.047 in(45)
- 0.049 in(45)
- 0.06 in(45)
- 0.062 in(18)
- 0.063 in(53)
- 0.069 in(45)
- 0.078 in(18)
- 0.079 in(26)
- 0.089 in(26)
- 0.095 in(26)
- 0.098 in(8)
- 0.125 in(8)
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Corner Radius
Corner Radius
- 0.05 mm(18)
- 0.076 mm(61)
- 0.1 mm(45)
- 0.125 mm(18)
- 0.151 mm(26)
- 0.176 mm(38)
- 0.2 mm(61)
- 0.225 mm(18)
- 0.25 mm(38)
- 0.275 mm(18)
- 0.301 mm(18)
- 0.325 mm(26)
- 0.351 mm(26)
- 0.4 mm(20)
- 0.45 mm(26)
- 0.476 mm(8)
- 0.5 mm(45)
- 0.576 mm(26)
- 0.75 mm(27)
- 0.775 mm(45)
- 0.826 mm(2)
- 0.9 mm(26)
- 1.0 mm(45)
- 1.201 mm(45)
- 1.25 mm(45)
- 1.5 mm(45)
- 1.576 mm(18)
- 1.6 mm(53)
- 1.75 mm(45)
- 1.975 mm(18)
- 2.0 mm(26)
- 2.25 mm(26)
- 2.401 mm(26)
- 2.5 mm(8)
- 3.176 mm(8)
to
Application
Minimum Depth of Cut
Minimum Depth of Cut
Minimum Feed
Minimum Feed
Grade Of Cutting Tool
Grade Of Cutting Tool
- K1 (8)
- K2885 (45)
- K313 (53)
- K420 (63)
- K4H (33)
- K68 (63)
- KB1345 (26)
- KB1630 (26)
- KB5625 (18)
- KBH20 (8)
- KC250 (53)
- KC5010 (63)
- KC5025 (63)
- KC5410 (53)
- KC710 (53)
- KC720 (61)
- KC722 (53)
- KC730 (63)
- KC732 (18)
- KC810 (63)
- KC850 (55)
- KC910 (33)
- KC9110 (53)
- KC9120 (18)
- KC9320 (53)
- KC935 (53)
- KC950 (53)
- KCK20 (41)
- KCK20B (53)
- KCP10B (53)
- KCP25B (53)
- KCP25C (53)
- KCU10 (63)
- KCU10B (63)
- KCU25 (63)
- KCU25B (63)
- KD050 (8)
- KD081 (18)
- KD100 (23)
- KD120 (26)
- KD1425 (18)
- KT175 (45)
- KT315 (53)
- KU10T (53)
- KU25T (53)
- KU30T (53)
- KY3000 (26)
Hand Of Tool
Hand Of Tool
- L (24)
- R (39)
F Dimension
F Dimension
- 6.551 mm(3)
- 6.726 mm(1)
- 7.0 mm(2)
- 8.25 mm(1)
- 10.3 mm(1)
- 10.775 mm(1)
- 10.976 mm(4)
- 11.0 mm(4)
- 11.101 mm(2)
- 12.576 mm(3)
- 12.701 mm(2)
- 13.0 mm(2)
- 14.15 mm(3)
- 14.275 mm(2)
- 17.0 mm(4)
- 17.35 mm(2)
- 17.475 mm(4)
- 22.0 mm(2)
- 22.225 mm(2)
- 25.401 mm(2)
- 27.0 mm(4)
- 28.576 mm(1)
- 31.75 mm(4)
- 34.926 mm(4)
- 35.0 mm(1)
- 38.1 mm(1)
- 41.276 mm(1)
to
F Dimension
F Dimension
- 0.258 in(3)
- 0.265 in(1)
- 0.276 in(2)
- 0.325 in(1)
- 0.406 in(1)
- 0.424 in(1)
- 0.432 in(4)
- 0.433 in(4)
- 0.437 in(2)
- 0.495 in(3)
- 0.5 in(2)
- 0.512 in(2)
- 0.557 in(3)
- 0.562 in(2)
- 0.669 in(4)
- 0.683 in(2)
- 0.689 in(4)
- 0.866 in(2)
- 0.875 in(2)
- 1.0 in(2)
- 1.063 in(4)
- 1.125 in(1)
- 1.25 in(4)
- 1.375 in(4)
- 1.379 in(1)
- 1.5 in(1)
- 1.625 in(1)
to
Minimum Axial Groove Diameter
Minimum Axial Groove Diameter
- 11.175 mm(3)
- 11.5 mm(2)
- 12.201 mm(1)
- 15.25 mm(1)
- 18.5 mm(2)
- 18.55 mm(6)
- 20.326 mm(1)
- 22.0 mm(3)
- 25.401 mm(5)
- 26.0 mm(2)
- 28.576 mm(5)
- 34.0 mm(4)
- 34.926 mm(6)
- 44.0 mm(2)
- 44.45 mm(2)
- 50.801 mm(2)
- 54.0 mm(4)
- 57.151 mm(1)
- 63.5 mm(4)
- 69.851 mm(4)
- 70.0 mm(1)
- 76.2 mm(1)
- 82.551 mm(1)
to
Minimum Axial Groove Diameter
Minimum Axial Groove Diameter
- 0.44 in(3)
- 0.453 in(2)
- 0.48 in(1)
- 0.6 in(1)
- 0.728 in(2)
- 0.73 in(6)
- 0.8 in(1)
- 0.866 in(3)
- 1.0 in(5)
- 1.024 in(2)
- 1.125 in(5)
- 1.339 in(4)
- 1.375 in(6)
- 1.732 in(2)
- 1.75 in(2)
- 2.0 in(2)
- 2.126 in(4)
- 2.25 in(1)
- 2.5 in(4)
- 2.75 in(4)
- 2.757 in(1)
- 3.0 in(1)
- 3.25 in(1)
to
Maximum Axial Groove Diameter
Maximum Axial Groove Diameter
- 393.661 in(62)
to
Maximum Axial Groove Diameter
Maximum Axial Groove Diameter
- 9999.0 mm(62)
to
Maximum Bore Depth
Maximum Bore Depth
- 1.23 in(1)
- 1.232 in(1)
- 1.291 in(1)
- 1.5 in(1)
- 1.555 in(1)
- 1.87 in(1)
- 1.891 in(2)
- 2.0 in(3)
- 2.499 in(1)
- 2.5 in(4)
- 2.52 in(2)
- 3.0 in(4)
- 3.125 in(1)
- 3.15 in(2)
- 3.75 in(3)
- 3.781 in(1)
- 3.938 in(4)
- 4.0 in(4)
- 4.5 in(2)
- 5.0 in(2)
- 5.039 in(2)
- 6.0 in(4)
- 6.299 in(4)
- 7.0 in(3)
- 7.875 in(1)
- 8.0 in(6)
- 10.0 in(2)
to
Maximum Bore Depth
Maximum Bore Depth
- 31.25 mm(1)
- 31.3 mm(1)
- 32.801 mm(1)
- 38.1 mm(1)
- 39.5 mm(1)
- 47.5 mm(1)
- 48.0 mm(2)
- 50.801 mm(3)
- 63.475 mm(1)
- 63.5 mm(4)
- 64.0 mm(2)
- 76.2 mm(4)
- 79.375 mm(1)
- 80.0 mm(2)
- 95.25 mm(3)
- 96.0 mm(1)
- 100.0 mm(4)
- 101.601 mm(4)
- 114.301 mm(2)
- 127.0 mm(2)
- 128.0 mm(2)
- 152.4 mm(4)
- 160.0 mm(4)
- 177.8 mm(3)
- 200.0 mm(1)
- 203.201 mm(6)
- 254.0 mm(2)
to
Boring Bar Material
Boring Bar Material
- C (9)
- H (6)
- S (48)
Front-End
Clamp Style
Clamp Style
- N (62)
Cutting Width
Cutting Width
- 0.02 in(27)
- 0.031 in(35)
- 0.035 in(27)
- 0.039 in(45)
- 0.041 in(27)
- 0.047 in(53)
- 0.055 in(27)
- 0.058 in(27)
- 0.06 in(45)
- 0.062 in(53)
- 0.067 in(27)
- 0.069 in(45)
- 0.073 in(18)
- 0.077 in(27)
- 0.078 in(18)
- 0.079 in(45)
- 0.088 in(45)
- 0.089 in(37)
- 0.094 in(8)
- 0.095 in(53)
- 0.097 in(18)
- 0.098 in(45)
- 0.105 in(18)
- 0.108 in(45)
- 0.11 in(18)
- 0.119 in(53)
- 0.122 in(18)
- 0.125 in(53)
- 0.126 in(53)
- 0.128 in(45)
- 0.129 in(27)
- 0.131 in(8)
- 0.138 in(53)
- 0.143 in(18)
- 0.147 in(12)
- 0.15 in(15)
- 0.151 in(12)
- 0.152 in(27)
- 0.156 in(18)
- 0.157 in(26)
- 0.167 in(26)
- 0.169 in(18)
- 0.177 in(26)
- 0.178 in(18)
- 0.185 in(21)
- 0.188 in(26)
- 0.189 in(26)
- 0.192 in(8)
- 0.193 in(8)
- 0.195 in(18)
- 0.196 in(18)
- 0.197 in(8)
- 0.202 in(8)
- 0.213 in(8)
- 0.217 in(8)
- 0.218 in(2)
- 0.219 in(8)
- 0.237 in(8)
- 0.25 in(10)
- 0.256 in(8)
- 0.281 in(2)
- 0.312 in(2)
- 0.375 in(2)
- 0.384 in(2)
to
Cutting Width
Cutting Width
- 0.5 mm(27)
- 0.775 mm(35)
- 0.8 mm(27)
- 0.9 mm(27)
- 1.0 mm(45)
- 1.05 mm(27)
- 1.201 mm(53)
- 1.401 mm(27)
- 1.475 mm(27)
- 1.5 mm(45)
- 1.576 mm(53)
- 1.701 mm(27)
- 1.75 mm(45)
- 1.826 mm(18)
- 1.951 mm(27)
- 1.975 mm(18)
- 2.0 mm(45)
- 2.2 mm(45)
- 2.225 mm(45)
- 2.25 mm(37)
- 2.375 mm(8)
- 2.401 mm(53)
- 2.475 mm(18)
- 2.5 mm(45)
- 2.676 mm(18)
- 2.75 mm(45)
- 2.801 mm(18)
- 3.0 mm(53)
- 3.1 mm(18)
- 3.176 mm(53)
- 3.2 mm(53)
- 3.25 mm(45)
- 3.276 mm(27)
- 3.325 mm(8)
- 3.5 mm(53)
- 3.6 mm(18)
- 3.725 mm(12)
- 3.801 mm(15)
- 3.825 mm(12)
- 3.85 mm(27)
- 3.95 mm(18)
- 3.975 mm(8)
- 4.0 mm(26)
- 4.25 mm(26)
- 4.3 mm(18)
- 4.5 mm(26)
- 4.525 mm(18)
- 4.7 mm(21)
- 4.775 mm(26)
- 4.801 mm(26)
- 4.875 mm(8)
- 4.9 mm(8)
- 4.95 mm(18)
- 4.976 mm(18)
- 5.0 mm(8)
- 5.125 mm(8)
- 5.4 mm(8)
- 5.5 mm(8)
- 5.525 mm(2)
- 5.575 mm(8)
- 6.0 mm(8)
- 6.351 mm(10)
- 6.5 mm(8)
- 7.125 mm(2)
- 7.926 mm(2)
- 9.525 mm(2)
- 9.75 mm(2)
to
Insert Size
Insert Size
- 1 (8)
- 2 (27)
- 3 (18)
- 4 (8)
- 6 (2)
Maximum Cutting Depth
Maximum Cutting Depth
- 0.04 in(1)
- 0.063 in(2)
- 0.067 in(1)
- 0.075 in(1)
to
Maximum Cutting Depth
Maximum Cutting Depth
- 1.026 mm(1)
- 1.6 mm(2)
- 1.701 mm(1)
- 1.901 mm(1)
to
Insert Geometry
Cutting Tool Material
Cutting Tool Material
- B H (26)
- B L (18)
- C N (26)
- D P (23)
- H T (53)
- H W (63)
Back-End
Back-End Diameter
Back-End Diameter
- 7.9 mm(1)
- 9.5 mm(1)
- 9.525 mm(1)
- 10.0 mm(1)
- 12.0 mm(3)
- 12.701 mm(8)
- 15.875 mm(6)
- 16.0 mm(3)
- 19.05 mm(5)
- 20.0 mm(2)
- 25.0 mm(4)
- 25.401 mm(6)
- 31.75 mm(2)
- 32.0 mm(2)
- 38.1 mm(2)
- 40.0 mm(4)
- 44.45 mm(3)
- 50.0 mm(1)
- 50.801 mm(6)
- 63.5 mm(2)
to
Back-End Diameter
Back-End Diameter
- 0.311 in(1)
- 0.374 in(1)
- 0.375 in(1)
- 0.394 in(1)
- 0.473 in(3)
- 0.5 in(8)
- 0.625 in(6)
- 0.63 in(3)
- 0.75 in(5)
- 0.787 in(2)
- 0.984 in(4)
- 1.0 in(6)
- 1.25 in(2)
- 1.26 in(2)
- 1.5 in(2)
- 1.575 in(4)
- 1.75 in(3)
- 1.969 in(1)
- 2.0 in(6)
- 2.5 in(2)
to
Shank Height
Shank Height
- 0.606 in(1)
- 0.939 in(1)
- 1.214 in(2)
- 1.53 in(4)
- 1.848 in(1)
to
Shank Height
Shank Height
- 15.4 mm(1)
- 23.826 mm(1)
- 30.826 mm(2)
- 38.825 mm(4)
- 46.95 mm(1)
to
Shank Width
Shank Width
- 0.864 in(1)
- 1.141 in(2)
- 1.455 in(4)
- 1.848 in(1)
to
Shank Width
Shank Width
- 21.951 mm(1)
- 28.951 mm(2)
- 36.95 mm(4)
- 46.95 mm(1)
to
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