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About Countersinks
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Choose the right countersink angle, body diameter, and number of flutes for your application.
Fluteless Smooth-Finish Countersinks for Screws
High-Speed Steel
 |
0 Flutes |
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
82° Countersink Angle | |||||||||
| 5/32" to 13/32" | 7/16" | 1/4" | 1 21/32" | Round | Republic Drill | 2739A32 | 000000 | ||
| 3/16" to 17/32" | 9/16" | 1/4" | 1 7/8" | Round | Republic Drill | 2739A33 | 00000 | ||
| 5/16" to 25/32" | 13/16" | 1/4" | 2 1/8" | Round | Republic Drill | 2739A44 | 00000 | ||
| 5/16" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Republic Drill | 2739A34 | 00000 | ||
| 7/16" to 7/8" | 15/16" | 1/2" | 2 19/32" | Round | Republic Drill | 2739A45 | 00000 | ||
| 9/16" to 1 1/16" | 1 1/8" | 1/2" | 2 29/32" | Round | Republic Drill | 2739A35 | 00000 | ||
| 5/8" to 1 15/32" | 1 1/2" | 1/2" | 2 7/8" | Round | Republic Drill | 2739A46 | 000000 | ||
| 3/4" to 1 3/4" | 1 3/4" | 5/8" | 3 1/8" | Round | Republic Drill | 2739A47 | 000000 | ||
| 1" to 2" | 2 1/8" | 5/8" | 3 1/2" | Round | Republic Drill | 2739A48 | 000000 | ||
| 1 1/4" to 2 1/2" | 2 5/8" | 3/4" | 3 7/8" | Round | Republic Drill | 2739A49 | 000000 | ||
90° Countersink Angle | |||||||||
| 5/32" to 13/32" | 7/16" | 1/4" | 1 21/32" | Round | Republic Drill | 2739A37 | 00000 | ||
| 3/16" to 17/32" | 9/16" | 1/4" | 1 7/8" | Round | Republic Drill | 2739A38 | 00000 | ||
| 5/16" to 25/32" | 13/16" | 1/4" | 2 1/8" | Round | Republic Drill | 2739A81 | 00000 | ||
| 5/16" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Republic Drill | 2739A39 | 00000 | ||
| 9/16" to 1 1/16" | 1 1/8" | 1/2" | 2 29/32" | Round | Republic Drill | 2739A41 | 00000 | ||
| 5/8" to 1 15/32" | 1 1/2" | 1/2" | 2 7/8" | Round | Republic Drill | 2739A101 | 000000 | ||
Cobalt Steel
|
0 Flutes |
Tough and wear resistant, these countersinks last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without chipping on hard materials, such as nickel.
Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.
Aluminum Titanium Nitride (AlTiN) Coated—Our hardest and most wear-resistant coating. These countersinks cut through hardened steel and other metals up to Rockwell C70 without losing their sharp cutting edges.
Dia. | Uncoated | Titanium Nitride (TiN) Coated | Aluminum Titanium Nitride (AlTiN) Coated | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | Mfr. | Each | Mfr. | Each | |||||
0 Flutes | |||||||||||||||
82° Countersink Angle | |||||||||||||||
| 3/32" to 9/32" | 5/16" | 1/4" | 1 5/8" | Round | Keo | 2724A201 | 000000 | Keo | 2724A203 | 000000 | Keo | 2724A216 | 000000 | ||
| 5/32" to 29/64" | 1/2" | 5/16" | 1 3/4" | Round | — | ——— | 0 | Keo | 2724A205 | 00000 | Keo | 2724A218 | 00000 | ||
| 11/64" to 37/64" | 5/8" | 3/8" | 2 1/8" | Round | — | ——— | 0 | Keo | 2724A206 | 00000 | Keo | 2724A219 | 00000 | ||
| 13/64" to 27/64" | 7/16" | 1/4" | 2 1/32" | Round | Melin Tool | 2724A122 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 13/64" to 45/64" | 3/4" | 3/8" | 2 3/8" | Round | — | ——— | 0 | Keo | 2724A207 | 00000 | Keo | 2724A221 | 00000 | ||
| 19/64" to 59/64" | 1" | 3/8" | 2 5/8" | Round | — | ——— | 0 | Keo | 2724A208 | 00000 | Keo | 2724A222 | 00000 | ||
| 5/16" to 17/32" | 9/16" | 1/4" | 2" | Round | Melin Tool | 2724A132 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 1/2" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Melin Tool | 2724A142 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 3/4" to 1 3/32" | 1 1/8" | 1/2" | 2 7/8" | Round | Melin Tool | 2724A152 | 000000 | — | ——— | 0 | — | ——— | 0 | ||
90° Countersink Angle | |||||||||||||||
| 3/32" to 9/32" | 5/16" | 1/4" | 1 5/8" | Round | Keo | 2724A202 | 00000 | Keo | 2724A209 | 00000 | Keo | 2724A223 | 00000 | ||
| 5/32" to 29/64" | 1/2" | 5/16" | 1 3/4" | Round | — | ——— | 0 | Keo | 2724A212 | 00000 | Keo | 2724A225 | 00000 | ||
| 11/64" to 37/64" | 5/8" | 3/8" | 2 1/8" | Round | — | ——— | 0 | Keo | 2724A213 | 00000 | Keo | 2724A226 | 00000 | ||
| 13/64" to 27/64" | 7/16" | 1/4" | 2 1/32" | Round | Melin Tool | 2724A123 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 13/64" to 45/64" | 3/4" | 3/8" | 2 3/8" | Round | — | ——— | 0 | Keo | 2724A214 | 00000 | Keo | 2724A227 | 00000 | ||
| 19/64" to 59/64" | 1" | 3/8" | 2 5/8" | Round | — | ——— | 0 | Keo | 2724A215 | 00000 | Keo | 2724A228 | 00000 | ||
| 5/16" to 17/32" | 9/16" | 1/4" | 2" | Round | Melin Tool | 2724A133 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 1/2" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Melin Tool | 2724A143 | 00000 | — | ——— | 0 | — | ——— | 0 | ||
| 3/4" to 1 3/32" | 1 1/8" | 1/2" | 2 7/8" | Round | Melin Tool | 2724A153 | 000000 | — | ——— | 0 | — | ——— | 0 | ||
Fluteless Smooth-Finish Countersinks with Pilot for Screws
High-Speed Steel
 |
0 Flutes |
These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
Dia. | Pilot | Uncoated | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Dia. | Lg. | For Screw Size | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | ||||||||||||
82° Countersink Angle | ||||||||||||
| 1/4" to 33/64" | 33/64" | 3/8" | 1/4" | 5/32" | 1/4" | 2" | Round | Republic Drill | 2739A64 | 000000 | ||
| 5/16" to 41/64" | 41/64" | 3/8" | 5/16" | 5/32" | 5/16" | 2 3/16" | Round | Republic Drill | 2739A66 | 00000 | ||
| 3/8" to 49/64" | 49/64" | 1/2" | 3/8" | 5/32" | 3/8" | 2 1/2" | Round | Republic Drill | 2739A68 | 00000 | ||
| 7/16" to 53/64" | 53/64" | 1/2" | 7/16" | 7/32" | 7/16" | 2 11/16" | Round | Republic Drill | 2739A71 | 00000 | ||
| 1/2" to 15/16" | 15/16" | 1/2" | 1/2" | 1/4" | 1/2" | 2 11/16" | Round | Republic Drill | 2739A73 | 00000 | ||
Fluteless Smooth-Finish Countersink Sets with Pilot for Screws
 |
Cut a smooth, accurate seat for your screw head on the first pass. The built-in pilot centers the countersink while the hollow body prevents chip buildup, vibration, and wobbling.
High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
82° Countersink Angle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
No. of Flutes | No. of Pieces | For Hole Dia. | Finish | Shank Type | Container Type | Mfr. | Each | |||
High-Speed Steel | ||||||||||
| 0 | 5 | 1/4" to 15/16" | Uncoated | Round | Wood Stand | Republic Drill | 2739A29 | 0000000 | ||
Fluteless Smooth-Finish Countersinks for Rivets
|
High-Speed Steel
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
100° Countersink Angle | |||||||||
| 5/32" to 13/32" | 7/16" | 1/4" | 1 21/32" | Round | Republic Drill | 2739A59 | 000000 | ||
| 3/16" to 17/32" | 9/16" | 1/4" | 1 7/8" | Round | Republic Drill | 2739A61 | 00000 | ||
| 5/16" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Republic Drill | 2739A62 | 00000 | ||
| 9/16" to 1 1/16" | 1 1/8" | 1/2" | 2 29/32" | Round | Republic Drill | 2739A63 | 00000 | ||
Fluteless Smooth-Finish Countersink Sets for Screws
 |
With a hollow body and single cutting edge, these countersinks make less contact with the hole than solid-body countersinks. The reduced friction minimizes vibration and leaves a more accurate, tight-fitting recess for your screw head.
High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
Cobalt Steel—Tough and wear resistant, these countersinks last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without chipping on hard materials, such as nickel.
Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion better than uncoated and black oxide countersinks, so they stay sharp over longer periods.
For Hole Dia. | 82° Countersink Angle | 90° Countersink Angle | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Flutes | No. of Pieces | 1/4" Shank | 5/16" Shank | 3/8" Shank | 1/2" Shank | 5/8" Shank | Finish | Shank Type | Container Type | Mfr. | Each | Mfr. | Each | ||||
High-Speed Steel | |||||||||||||||||
| 0 | 5 | 1/16", 5/32", 3/16" | — | — | 5/16", 9/16" | — | Uncoated | Round | Wood Stand | Republic Drill | 2739A42 | 0000000 | Republic Drill | 2739A43 | 0000000 | ||
| 0 | 8 | 1/16", 5/32", 3/16" | — | — | 5/16", 9/16", 5/8" | 3/4", 1" | Uncoated | Round | Wood Stand | Republic Drill | 2739A21 | 000000 | — | ——— | 0 | ||
Cobalt Steel | |||||||||||||||||
| 0 | 4 | 5/16", 3/8" | 1/2" | 5/8" | — | — | Uncoated | Round | Plastic Case | Keo | 2739A22 | 00000 | Keo | 2739A24 | 00000 | ||
| 0 | 4 | 5/16", 3/8" | 1/2" | 5/8" | — | — | Titanium Nitride (TiN) Coated | Round | Plastic Case | Keo | 2739A23 | 000000 | Keo | 2739A25 | 000000 | ||
Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Screws
Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Rivets
 |
High-Speed Steel
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
100° Countersink Angle | |||||||||
| 1/16" to 15/64" | 1/4" | 1/4" | 1 7/8" | Round | Republic Drill | 2739A58 | 000000 | ||
Fluteless Smooth-Finish Countersink Sets for Rivets
|
With a hollow body and single cutting edge, these countersinks make less contact with the hole than solid-body countersinks. The reduced friction minimizes vibration and leaves a more accurate, tight-fitting recess for your screw head.
High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
Cobalt Steel—Tough and wear resistant, these countersinks last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without chipping on hard materials, such as nickel.
For Hole Dia. | 100° Countersink Angle | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Flutes | No. of Pieces | 1/4" Shank | 5/16" Shank | 3/8" Shank | 1/2" Shank | Finish | Shank Type | Container Type | Mfr. | Each | |||
High-Speed Steel | |||||||||||||
| 0 | 5 | 1/16", 5/32", 3/16" | — | — | 5/16", 9/16" | Uncoated | Round | Wood Stand | Republic Drill | 2739A28 | 0000000 | ||
Cobalt Steel | |||||||||||||
| 0 | 4 | 5/16", 3/8" | 1/2" | 5/8" | — | Uncoated | Round | Plastic Case | Keo | 2739A17 | 00000 | ||
Fluteless Smooth-Finish Countersinks for Lathe Centers
High-Speed Steel
|
0 Flutes |
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
60° Countersink Angle | |||||||||
| 3/16" to 13/32" | 7/16" | 1/4" | 1 25/32" | Round | Republic Drill | 2739A53 | 000000 | ||
| 5/16" to 17/32" | 9/16" | 1/4" | 1 15/16" | Round | Republic Drill | 2739A54 | 00000 | ||
| 7/16" to 25/32" | 13/16" | 1/4" | 2 3/8" | Round | Republic Drill | 2739A55 | 00000 | ||
| 7/16" to 25/32" | 13/16" | 1/2" | 2 3/4" | Round | Republic Drill | 2739A56 | 00000 | ||
| 11/16" to 1 3/32" | 1 1/8" | 1/2" | 2 11/64" | Round | Republic Drill | 2739A57 | 00000 | ||
Cobalt Steel
|
0 Flutes |
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
60° Countersink Angle | |||||||||
| 13/64" to 27/64" | 7/16" | 1/4" | 2 1/32" | Round | Melin Tool | 2724A121 | 000000 | ||
| 5/16" to 17/32" | 9/16" | 1/4" | 2" | Round | Melin Tool | 2724A131 | 00000 | ||
| 1/2" to 25/32" | 13/16" | 1/2" | 2 5/8" | Round | Melin Tool | 2724A141 | 00000 | ||
| 3/4" to 1 3/32" | 1 1/8" | 1/2" | 2 7/8" | Round | Melin Tool | 2724A151 | 000000 | ||
Fluteless Smooth-Finish Countersink Sets for Lathe Centers
|
With a hollow body and single cutting edge, these countersinks make less contact with the hole than solid-body countersinks. The reduced friction minimizes vibration and leaves a more accurate, tight-fitting recess for your screw head.
High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
For Hole Dia. | 60° Countersink Angle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Flutes | No. of Pieces | 1/4" Shank | 1/2" Shank | Finish | Shank Type | Container Type | Mfr. | Each | |||
High-Speed Steel | |||||||||||
| 0 | 5 | 1/8", 3/16", 5/16" | 7/16", 11/16" | Uncoated | Round | Wood Stand | Republic Drill | 2739A27 | 0000000 | ||
Fluteless Smooth-Finish Countersinks with Two Countersinking Ends for Lathe Centers
|
High-Speed Steel
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
60° Countersink Angle | |||||||||
| 1/8" to 15/64" | 1/4" | 1/4" | 1 7/8" | Round | Republic Drill | 2739A52 | 000000 | ||
Cobalt Steel
Dia. | Uncoated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
For Hole Dia. | Body | Shank | Overall Lg. | Shank Type | Mfr. | Each | |||
0 Flutes | |||||||||
60° Countersink Angle | |||||||||
| 3/32" to 15/64" | 1/4" | 1/4" | 1 1/2" | Round | Melin Tool | 2724A111 | 000000 | ||
Fluteless Smooth-Finish Hex-Bit Countersink Sets for Screws
 |
Create a smoother finish than you can with solid-body hex-bit countersinks. The countersinks in these sets are hollow and have a single cutting edge, so they make less contact—and create less friction—as they cut holes. Pop them into screwdrivers and other tools that accept 1/4" hex bits. They’re often used to deburr and chamfer screw holes. You can also use them to create a 90° countersink angle that’s compatible with metric flat- and oval-head screws.
High-Speed Steel—These versatile, wear-resistant countersinks cut cleanly in most materials, including plastic, aluminum, and steel.
90° Countersink Angle | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Flutes | No. of Pieces | Body Dia. Included | For Hole Dia. | Finish | Includes | Shank Type | Container Type | Mfr. | Each | |||
High-Speed Steel | ||||||||||||
| 0 | 4 | 5/16", 1/2", 13/16" | 5/64" to 13/16" | Uncoated | Steel Deburring Blade | Hex | Plastic Case | Shaviv | 11167N101 | 0000000 | ||
Fluteless Smooth-Finish Countersink Drill Bits for Screws
 |
Create a smoother, more accurate finish than you can with solid-body countersink drill bits. Since these bits are hollow, they remove chips and make less contact as they cut to minimize friction and vibration. Also known as step drill bits, they countersink as they drill. The 82° countersink angle is compatible with the profile of flat- and oval-head inch screws.
Uncoated Cobalt Steel—Tough and wear resistant, these drill bits last at least twice as long as high-speed steel drill bits.
Dia. | Lg. | 82° Countersink Angle | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body | Step | Step | Overall | Shank Dia. | Point Angle | For Use On | Mfr. | Each | |||
Uncoated Cobalt Steel | ||||||||||||
0 Flutes | ||||||||||||
| No. 6 | 7/16" | 0.154" | 7/16" | 4" | 0.4380" | 118° | Aluminum, Brass, Bronze, Plastic | Link Industries | 11207N11 | 000000 | ||
| No. 8 | 7/16" | 0.180" | 7/16" | 4" | 0.4380" | 118° | Aluminum, Brass, Bronze, Plastic | Link Industries | 11207N12 | 00000 | ||
| No. 10 | 7/16" | 0.206" | 7/16" | 4" | 0.4380" | 118° | Aluminum, Brass, Bronze, Plastic | Link Industries | 11207N13 | 00000 | ||
| 1/4" | 1/2" | 0.266" | 5/8" | 4" | 0.5000" | 118° | Aluminum, Brass, Bronze, Plastic | Link Industries | 11207N14 | 000000 | ||
| 5/16" | 11/16" | 0.328" | 3/4" | 4" | 0.5000" | 118° | Aluminum, Brass, Bronze, Plastic | Link Industries | 11207N15 | 000000 | ||
