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About Counterbores
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Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.
Changeable-Pilot Counterbores
 |
Shown with Pilot (Sold Separately) |
A popular choice when counterboring for nonstandard screw sizes, this tool creates counterbored holes for screws of various thread diameters. Attach a pilot (sold separately) that matches the diameter of your pilot hole. The pilot centers the counterbore and prevents wobbling to create an accurate recess for the screw head on the first try.
Carbide-Tipped Steel
 |  |
Round Shank | Reduced-Round Shank |
Shank | Uncoated | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Body Dia. | Overall Lg. | For Pilot Shank Dia. | Dia. | Type | No. of Flutes | Mfr. | Each | |||
| 1/4" | 2 3/8" | 3/32" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A21 | 000000 | ||
| 1/4" | 3 13/16" | 3/32" | 15/64" | Round | 3 | Rock River Tool | 2814A81 | 000000 | ||
| 9/32" | 2 3/8" | 3/32" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A22 | 00000 | ||
| 9/32" | 3 13/16" | 3/32" | 17/64" | Round | 3 | Rock River Tool | 2814A421 | 000000 | ||
| 5/16" | 2 3/8" | 3/32" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A23 | 00000 | ||
| 5/16" | 3 13/16" | 3/32" | 19/64" | Round | 3 | Rock River Tool | 2814A591 | 000000 | ||
| 11/32" | 2 3/8" | 3/32" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A24 | 00000 | ||
| 11/32" | 3 13/16" | 3/32" | 5/16" | Round | 3 | Rock River Tool | 2814A311 | 000000 | ||
| 3/8" | 2 3/8" | 3/32" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A25 | 00000 | ||
| 3/8" | 4 1/16" | 5/32" | 5/16" | Round | 3 | Rock River Tool | 2814A83 | 000000 | ||
| 13/32" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A26 | 00000 | ||
| 13/32" | 4 1/16" | 5/32" | 3/8" | Round | 3 | Rock River Tool | 2814A321 | 000000 | ||
| 7/16" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A27 | 00000 | ||
| 7/16" | 4 1/16" | 5/32" | 3/8" | Round | 3 | Rock River Tool | 2814A84 | 000000 | ||
| 15/32" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A28 | 00000 | ||
| 15/32" | 4 5/16" | 3/16" | 7/16" | Round | 3 | Rock River Tool | 2814A331 | 000000 | ||
| 1/2" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A29 | 00000 | ||
| 1/2" | 4 5/16" | 3/16" | 7/16" | Round | 3 | Rock River Tool | 2814A85 | 000000 | ||
| 17/32" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A31 | 00000 | ||
| 17/32" | 4 5/16" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A341 | 000000 | ||
| 9/16" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A32 | 000000 | ||
| 9/16" | 4 5/16" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A86 | 000000 | ||
| 19/32" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A33 | 000000 | ||
| 19/32" | 5 1/8" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A351 | 000000 | ||
| 5/8" | 2 3/4" | 1/8" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A34 | 000000 | ||
| 5/8" | 5 1/8" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A87 | 000000 | ||
| 21/32" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A35 | 000000 | ||
| 21/32" | 5 1/8" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A361 | 000000 | ||
| 11/16" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A36 | 000000 | ||
| 11/16" | 5 1/8" | 3/16" | 1/2" | Round | 3 | Rock River Tool | 2814A371 | 000000 | ||
| 23/32" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A37 | 000000 | ||
| 23/32" | 5 3/8" | 1/4" | 1/2" | Round | 3 | Rock River Tool | 2814A381 | 000000 | ||
| 3/4" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A38 | 000000 | ||
| 3/4" | 5 3/8" | 1/4" | 1/2" | Round | 3 | Rock River Tool | 2814A89 | 000000 | ||
| 25/32" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A39 | 000000 | ||
| 25/32" | 5 3/8" | 1/4" | 5/8" | Round | 3 | Rock River Tool | 2814A391 | 000000 | ||
| 13/16" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A41 | 000000 | ||
| 13/16" | 5 3/8" | 1/4" | 5/8" | Round | 3 | Rock River Tool | 2814A91 | 000000 | ||
| 7/8" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A43 | 000000 | ||
| 7/8" | 5 3/8" | 1/4" | 3/4" | Round | 3 | Rock River Tool | 2814A531 | 000000 | ||
| 15/16" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A45 | 000000 | ||
| 15/16" | 6 1/8" | 1/4" | 3/4" | Round | 3 | Rock River Tool | 2814A561 | 000000 | ||
| 1" | 2 3/4" | 3/16" | 1/4" | Reduced Round | 3 | Rock River Tool | 31125A47 | 000000 | ||
| 1" | 6 3/8" | 5/16" | 3/4" | Round | 3 | Rock River Tool | 2814A94 | 000000 | ||
| 1 1/8" | 6 3/8" | 5/16" | 1" | Round | 3 | Rock River Tool | 2814A581 | 000000 | ||
 |
Pilot Head Dia. | Pilot Lg. | Each | |||
|---|---|---|---|---|---|
Uncoated Carbon Steel | |||||
3/32" Diameter Pilot Shank | |||||
| 3/32" | 3/32" | 3103A1 | 00000 | ||
| 1/8" | 1/8" | 3103A11 | 0000 | ||
| 5/32" | 5/32" | 3103A12 | 0000 | ||
| 3/16" | 3/16" | 3103A13 | 0000 | ||
| 7/32" | 7/32" | 3103A14 | 0000 | ||
| 1/4" | 1/4" | 3103A15 | 0000 | ||
1/8" Diameter Pilot Shank | |||||
| 1/8" | 1/8" | 3103A16 | 0000 | ||
| 5/32" | 5/32" | 3103A17 | 0000 | ||
| 3/16" | 3/16" | 3103A18 | 0000 | ||
| 7/32" | 7/32" | 3103A19 | 0000 | ||
| 1/4" | 1/4" | 3103A2 | 0000 | ||
| 5/16" | 5/16" | 3103A21 | 00000 | ||
| 3/8" | 3/8" | 3103A22 | 00000 | ||
5/32" Diameter Pilot Shank | |||||
| 3/16" | 3/16" | 3103A23 | 0000 | ||
| 7/32" | 7/32" | 3103A24 | 00000 | ||
| 1/4" | 1/4" | 3103A25 | 0000 | ||
| 9/32" | 9/32" | 3103A61 | 00000 | ||
| 5/16" | 5/16" | 3103A26 | 00000 | ||
| 3/8" | 3/8" | 3103A27 | 00000 | ||
3/16" Diameter Pilot Shank | |||||
| 3/16" | 3/16" | 3103A64 | 0000 | ||
| 1/4" | 1/4" | 3103A28 | 0000 | ||
| 9/32" | 9/32" | 3103A62 | 00000 | ||
| 5/16" | 5/16" | 3103A29 | 00000 | ||
| 11/32" | 11/32" | 3103A63 | 00000 | ||
| 3/8" | 3/8" | 3103A3 | 00000 | ||
| 13/32" | 13/32" | 3103A65 | 00000 | ||
| 7/16" | 7/16" | 3103A31 | 00000 | ||
| 15/32" | 15/32" | 3103A66 | 00000 | ||
| 1/2" | 1/2" | 3103A32 | 00000 | ||
| 17/32" | 17/32" | 3103A48 | 00000 | ||
| 9/16" | 9/16" | 3103A33 | 00000 | ||
| 5/8" | 5/8" | 3103A34 | 00000 | ||
1/4" Diameter Pilot Shank | |||||
| 5/16" | 5/16" | 3103A35 | 0000 | ||
| 3/8" | 3/8" | 3103A36 | 00000 | ||
| 7/16" | 7/16" | 3103A37 | 00000 | ||
| 1/2" | 1/2" | 3103A38 | 00000 | ||
| 9/16" | 9/16" | 3103A39 | 00000 | ||
| 5/8" | 5/8" | 3103A4 | 00000 | ||
| 11/16" | 11/16" | 3103A41 | 00000 | ||
| 3/4" | 3/4" | 3103A42 | 00000 | ||
| 13/16" | 13/16" | 3103A43 | 00000 | ||
5/16" Diameter Pilot Shank | |||||
| 3/8" | 3/8" | 3103A45 | 00000 | ||
| 7/16" | 7/16" | 3103A46 | 00000 | ||
| 1/2" | 1/2" | 3103A47 | 00000 | ||
| 5/8" | 5/8" | 3103A49 | 00000 | ||
| 11/16" | 11/16" | 3103A5 | 00000 | ||
| 3/4" | 3/4" | 3103A51 | 00000 | ||
| 1" | 1" | 3103A55 | 00000 | ||
Oversized Counterbores
Carbide-Tipped Steel
 |
The hardest and most wear-resistant counterbores we offer. These bits stay sharper at higher temperatures and faster speeds for the best performance on hard and abrasive materials.
Pilot | Shank | Uncoated | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia. | Dia. | Lg. | Overall Lg. | Dia. | Type | No. of Flutes | Mfr. | Each | |||
1/64" Oversize | ||||||||||||
| 1/4" | 0.398" | 17/64" | 0.313" | 5 5/8" | 5/16" | Round | 3 | Rock River Tool | 3218A113 | 0000000 | ||
| 5/16" | 0.491" | 21/64" | 0.375" | 6 1/8" | 3/8" | Round | 3 | Rock River Tool | 3218A123 | 000000 | ||
| 3/8" | 0.588" | 25/64" | 0.500" | 6 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A133 | 000000 | ||
| 7/16" | 0.679" | 29/64" | 0.500" | 7" | 1/2" | Round | 3 | Rock River Tool | 3218A143 | 000000 | ||
| 1/2" | 0.773" | 33/64" | 0.500" | 7 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A153 | 000000 | ||
| 5/8" | 0.961" | 41/64" | 0.625" | 7 5/8" | 5/8" | Round | 3 | Rock River Tool | 3218A163 | 000000 | ||
| 3/4" | 1.149" | 49/64" | 0.750" | 7 3/4" | 3/4" | Round | 3 | Rock River Tool | 3218A173 | 000000 | ||
| 7/8" | 1.338" | 57/64" | 0.875" | 8 1/8" | 7/8" | Round | 4 | Rock River Tool | 3218A183 | 000000 | ||
| 1" | 1.526" | 1 1/64" | 1.000" | 8 1/2" | 1" | Round | 4 | Rock River Tool | 3218A193 | 000000 | ||
1/32" Oversize | ||||||||||||
| 1/4" | 0.413" | 9/32" | 0.313" | 5 5/8" | 5/16" | Round | 3 | Rock River Tool | 3218A112 | 000000 | ||
| 5/16" | 0.506" | 11/32" | 0.375" | 6 1/8" | 3/8" | Round | 3 | Rock River Tool | 3218A122 | 000000 | ||
| 3/8" | 0.603" | 13/32" | 0.500" | 6 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A132 | 000000 | ||
| 7/16" | 0.694" | 15/32" | 0.500" | 7" | 1/2" | Round | 3 | Rock River Tool | 3218A142 | 000000 | ||
| 1/2" | 0.788" | 17/32" | 0.500" | 7 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A152 | 000000 | ||
| 5/8" | 0.976" | 21/32" | 0.625" | 7 5/8" | 5/8" | Round | 3 | Rock River Tool | 3218A162 | 000000 | ||
| 3/4" | 1.164" | 25/32" | 0.750" | 7 3/4" | 3/4" | Round | 3 | Rock River Tool | 3218A172 | 000000 | ||
| 7/8" | 1.353" | 29/32" | 0.875" | 8 1/8" | 7/8" | Round | 4 | Rock River Tool | 3218A182 | 000000 | ||
| 1" | 1.541" | 1 1/32" | 1.000" | 8 1/2" | 1" | Round | 4 | Rock River Tool | 3218A192 | 000000 | ||
Built-in-Pilot Counterbores
Carbide-Tipped Steel
|
The hardest and most wear-resistant counterbores we offer. These bits stay sharper at higher temperatures and faster speeds for the best performance on hard and abrasive materials.
Pilot | Shank | Uncoated | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia. | Dia. | Lg. | Overall Lg. | Dia. | Type | No. of Flutes | Mfr. | Each | |||
| 1/4" | 0.382" | 1/4" | 0.313" | 5 5/8" | 5/16" | Round | 3 | Rock River Tool | 3218A111 | 0000000 | ||
| 5/16" | 0.475" | 5/16" | 0.375" | 6 1/8" | 3/8" | Round | 3 | Rock River Tool | 3218A121 | 000000 | ||
| 3/8" | 0.572" | 3/8" | 0.500" | 6 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A131 | 000000 | ||
| 7/16" | 0.663" | 7/16" | 0.500" | 7" | 1/2" | Round | 3 | Rock River Tool | 3218A141 | 000000 | ||
| 1/2" | 0.757" | 1/2" | 0.500" | 7 1/2" | 1/2" | Round | 3 | Rock River Tool | 3218A151 | 000000 | ||
| 5/8" | 0.945" | 5/8" | 0.625" | 7 5/8" | 5/8" | Round | 3 | Rock River Tool | 3218A161 | 000000 | ||
| 3/4" | 1.133" | 3/4" | 0.750" | 7 3/4" | 3/4" | Round | 3 | Rock River Tool | 3218A171 | 000000 | ||
| 7/8" | 1.322" | 7/8" | 0.875" | 8 1/8" | 7/8" | Round | 4 | Rock River Tool | 3218A181 | 000000 | ||
| 1" | 1.510" | 1" | 1.000" | 8 1/2" | 1" | Round | 4 | Rock River Tool | 3218A191 | 000000 | ||
Coolant-Fed Port Counterbores
Carbide-Tipped Steel
 |
The hardest and most wear-resistant counterbores we offer. They stay sharp at high temperatures and fast speeds to machine port holes with ease in aluminum, steel, and other metals.
Counterbores | Step Drill Bits | Thread Mills | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shank | Uncoated | ||||||||||||||||
For Thread Size | For Port Dash Size | Overall Lg. | Dia. | Lg. | Type | No. of Flutes | Pilot Lg. | Mil. Spec. | Mfr. | Each | Each | Each | |||||
SAE J1926/1 | |||||||||||||||||
| 7/16"-20 | 04 | 3 1/2" | 1/2" | 2" | Round | 3 | 0.551" | MS16142 | Everede Tool | 9833N11 | 0000000 | 9851N13 | 0000000 | 5277N26 | 0000000 | ||
| 9/16"-18 | 06 | 3 1/2" | 1/2" | 2" | Round | 3 | 0.610" | MS16142 | Everede Tool | 9833N12 | 000000 | 9851N15 | 000000 | 5277N28 | 000000 | ||
| 3/4"-16 | 08 | 3 1/2" | 3/4" | 2" | Round | 3 | 0.689" | MS16142 | Everede Tool | 9833N13 | 000000 | 9851N16 | 000000 | 5277N29 | 000000 | ||
SAE AS5202 | |||||||||||||||||
| 7/16"-20 | 04 | 3 1/2" | 1/2" | 2" | Round | 3 | 0.661" | MS33649 | Everede Tool | 9833N14 | 000000 | 9851N23 | 000000 | 5277N26 | 000000 | ||
| 9/16"-18 | 06 | 3 1/2" | 1/2" | 2" | Round | 3 | 0.714" | MS33649 | Everede Tool | 9833N15 | 000000 | 9851N25 | 000000 | 5277N28 | 000000 | ||
| 3/4"-16 | 08 | 4" | 3/4" | 2" | Round | 3 | 0.839" | MS33649 | Everede Tool | 9833N16 | 000000 | 9851N26 | 000000 | 5277N29 | 000000 | ||
Port Counterbores
Carbide-Tipped Steel
 |
The hardest and most wear-resistant counterbores we offer. They stay sharp at high temperatures and fast speeds to machine port holes with ease in aluminum, steel, and other metals.
Aluminum Titanium Nitride (AlTiN) Coated—The coating keeps these counterbores cool while cutting to extend their life. They're best for hard and abrasive materials, such as stainless steel and titanium.
Counterbores | Step Drill Bits | Thread Mills | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shank | Uncoated | Aluminum Titanium Nitride (AlTiN) Coated | |||||||||||||||||
For Thread Size | For Port Dash Size | Overall Lg. | Dia. | Lg. | Type | No. of Flutes | Pilot Lg. | Mil. Spec. | Mfr. | Each | Each | Each | Each | ||||||
SAE J1926/1 | |||||||||||||||||||
| 5/16"-24 | 02 | 3" | 1/2" | 1 3/4" | Round | 3 | 0.511" | MS16142 | Scientific Cutting Tools | 9869N17 | 0000000 | 9910N11 | 0000000 | 9851N11 | 0000000 | 5277N24 | 0000000 | ||
| 3/8"-24 | 03 | 3" | 1/2" | 1 3/4" | Round | 3 | 0.519" | MS16142 | Scientific Cutting Tools | 9869N18 | 000000 | 9910N12 | 000000 | 9851N12 | 000000 | 5277N25 | 000000 | ||
| 7/16"-20 | 04 | 3 1/8" | 1/2" | 1 7/8" | Round | 3 | 0.603" | MS16142 | Scientific Cutting Tools | 9869N19 | 000000 | 9910N13 | 000000 | 9851N13 | 000000 | 5277N26 | 000000 | ||
| 1/2"-20 | 05 | 3 1/8" | 1/2" | 1 7/8" | Round | 3 | 0.603" | MS16142 | Scientific Cutting Tools | 9869N21 | 000000 | 9910N14 | 000000 | 9851N14 | 000000 | 5277N27 | 000000 | ||
| 9/16"-18 | 06 | 3 3/8" | 1/2" | 1 7/8" | Round | 3 | 0.675" | MS16142 | Scientific Cutting Tools | 9869N22 | 000000 | 9910N15 | 000000 | 9851N15 | 000000 | 5277N28 | 000000 | ||
| 3/4"-16 | 08 | 3 11/16" | 3/4" | 2 1/8" | Round | 3 | 0.769" | MS16142 | Scientific Cutting Tools | 9869N23 | 000000 | 9910N16 | 000000 | 9851N16 | 000000 | 5277N29 | 000000 | ||
| 7/8"-14 | 10 | 3 13/16" | 3/4" | 2 1/8" | Round | 3 | 0.872" | MS16142 | Scientific Cutting Tools | 9869N24 | 000000 | ——— | 0 | ——— | 0 | 5277N31 | 000000 | ||
| 1 1/16"-12 | 12 | 3 15/16" | 3/4" | 2 1/8" | Round | 3 | 0.997" | MS16142 | Scientific Cutting Tools | 9869N25 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
| 1 3/16"-12 | 14 | 4 7/32" | 1" | 2 1/4" | Round | 3 | 1.007" | MS16142 | Scientific Cutting Tools | 9869N26 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
| 1 5/16"-12 | 16 | 4 1/4" | 1" | 2 1/4" | Round | 3 | 1.007" | MS16142 | Scientific Cutting Tools | 9869N27 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
SAE AS5202 | |||||||||||||||||||
| 5/16"-24 | 02 | 3" | 1/2" | 1 3/4" | Round | 3 | 0.629" | MS33649 | Scientific Cutting Tools | 9869N28 | 000000 | 9910N17 | 000000 | 9851N21 | 000000 | 5277N24 | 000000 | ||
| 3/8"-24 | 03 | 3" | 1/2" | 1 3/4" | Round | 3 | 0.643" | MS33649 | Scientific Cutting Tools | 9869N29 | 000000 | 9910N18 | 000000 | 9851N22 | 000000 | 5277N25 | 000000 | ||
| 7/16"-20 | 04 | 3 1/8" | 1/2" | 1 7/8" | Round | 3 | 0.716" | MS33649 | Scientific Cutting Tools | 9869N31 | 000000 | 9910N19 | 000000 | 9851N23 | 000000 | 5277N26 | 000000 | ||
| 1/2"-20 | 05 | 3 1/8" | 1/2" | 1 7/8" | Round | 3 | 0.721" | MS33649 | Scientific Cutting Tools | 9869N32 | 000000 | 9910N21 | 000000 | 9851N24 | 000000 | 5277N27 | 000000 | ||
| 9/16"-18 | 06 | 3 3/8" | 1/2" | 1 7/8" | Round | 3 | 0.789" | MS33649 | Scientific Cutting Tools | 9869N33 | 000000 | 9910N22 | 000000 | 9851N25 | 000000 | 5277N28 | 000000 | ||
| 5/8"-18 | 07 | 3 3/8" | 1/2" | 1 7/8" | Round | 3 | 0.805" | MS33649 | Scientific Cutting Tools | 9869N34 | 000000 | 9910N23 | 000000 | ——— | 0 | 5277N28 | 000000 | ||
| 3/4"-16 | 08 | 3 27/32" | 3/4" | 2 1/8" | Round | 3 | 0.924" | MS33649 | Scientific Cutting Tools | 9869N35 | 000000 | 9910N24 | 000000 | 9851N26 | 000000 | 5277N29 | 000000 | ||
| 13/16"-16 | 09 | 3 27/32" | 3/4" | 2 1/8" | Round | 3 | 0.940" | MS33649 | Scientific Cutting Tools | 9869N36 | 000000 | ——— | 0 | ——— | 0 | 5277N29 | 000000 | ||
| 7/8"-14 | 10 | 3 15/16" | 3/4" | 2 1/8" | Round | 3 | 1.030" | MS33649 | Scientific Cutting Tools | 9869N37 | 000000 | ——— | 0 | ——— | 0 | 5277N31 | 000000 | ||
| 1"-12 | 11 | 4 1/8" | 3/4" | 2 1/8" | Round | 3 | 1.164" | MS33649 | Scientific Cutting Tools | 9869N38 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
| 1 1/16"-12 | 12 | 4 1/8" | 3/4" | 2 1/8" | Round | 3 | 1.164" | MS33649 | Scientific Cutting Tools | 9869N39 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
| 1 3/16"-12 | 14 | 4 3/8" | 1" | 2 1/4" | Round | 3 | 1.174" | MS33649 | Scientific Cutting Tools | 9869N41 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
| 1 5/16"-12 | 16 | 4 3/8" | 1" | 2 1/4" | Round | 3 | 1.174" | MS33649 | Scientific Cutting Tools | 9869N42 | 000000 | ——— | 0 | ——— | 0 | 5277N32 | 000000 | ||
ISO 6149-1 | |||||||||||||||||||
| M8 × 1 mm | — | 3" | 1/2" | 1 3/4" | Round | 3 | 0.489" | — | Scientific Cutting Tools | 9869N16 | 000000 | ——— | 0 | ——— | 0 | 5277N22 | 000000 | ||
| M10 × 1 mm | — | 3" | 1/2" | 1 3/4" | Round | 3 | 0.502" | — | Scientific Cutting Tools | 9869N11 | 000000 | ——— | 0 | ——— | 0 | 5277N22 | 000000 | ||
| M12 × 1.5 mm | — | 3 1/8" | 1/2" | 1 7/8" | Round | 3 | 0.600" | — | Scientific Cutting Tools | 9869N12 | 000000 | ——— | 0 | ——— | 0 | 5277N33 | 000000 | ||
| M14 × 1.5 mm | — | 3 3/8" | 1/2" | 1 7/8" | Round | 4 | 0.610" | — | Scientific Cutting Tools | 9869N13 | 000000 | ——— | 0 | ——— | 0 | 5277N33 | 000000 | ||
| M16 × 1.5 mm | — | 3 3/8" | 1/2" | 1 7/8" | Round | 4 | 0.674" | — | Scientific Cutting Tools | 9869N14 | 000000 | ——— | 0 | ——— | 0 | 5277N33 | 000000 | ||
| M18 × 1.5 mm | — | 3 11/16" | 3/4" | 2 1/8" | Round | 4 | 0.743" | — | Scientific Cutting Tools | 9869N15 | 000000 | ——— | 0 | ——— | 0 | 5277N33 | 000000 | ||
