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HomeTools & Hangar Equipment100° Back Countersink
100° Back Countersink

100° Back Countersink

Bayonets? Did someone say bayonets? Yes, we have a large selection of bayonets, in case you're having trouble with the neighbors. Oh wait, no, not those kinds of bayonets. These are bayonet countersink bits, tools designed by Craig Tools and specially made for precision drilling. If you're looking for a particular countersink for metal drilling, these are of the highest quality and are very affordable. They're manufactured with extremely durable high-speed steel for the countersink metal, resulting in effective cutting and long life.

Our bayonet countersink drill bits are available in several diameters and pilot hole sizes. See the chart for additional information, and choose the correct 100 degree countersink bit for your application. If you're not sure what you need, our Sky Geeks can assist you, so give them a call!

Note that each of these 100 degree countersink bayonets require an AT404 series pilot for convenient use without necessitating additional parts or other compatible pilots.

If you have any additional questions, we encourage you to check out our knowledgeable Help Center.

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Part Number
ATI402B-4
Diameter
1/4"
Pilot Hole Size
3/32"
Price
$22.94
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Part Number
ATI402V-4
Diameter
1"
Pilot Hole Size
3/8"
Price
$39.43
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Part Number
ATI402A-4
Diameter
1/4"
Pilot Hole Size
1/8"
Price
$22.94
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Part Number
ATI402C-4
Diameter
5/16"
Pilot Hole Size
1/8"
Price
$22.47
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Part Number
ATI402D-4
Diameter
5/16"
Pilot Hole Size
5/32"
Price
$23.14
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Part Number
ATI402F-4
Diameter
3/8"
Pilot Hole Size
5/32"
Price
$25.27
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Part Number
ATI402E-4
Diameter
3/8"
Pilot Hole Size
3/16"
Price
$25.27
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Part Number
ATI402H-4
Diameter
7/16"
Pilot Hole Size
5/32"
Price
$24.79
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Part Number
ATI402G-4
Diameter
7/16"
Pilot Hole Size
3/16"
Price
$25.53
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Part Number
ATI402I-4
Diameter
1/2"
Pilot Hole Size
3/16"
Price
$27.73
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Part Number
ATI402J-4
Diameter
1/2"
Pilot Hole Size
1/4"
Price
$34.78
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Part Number
ATI402K-4
Diameter
9/16"
Pilot Hole Size
3/16"
Price
$32.14
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Part Number
ATI402L-4
Diameter
9/16"
Pilot Hole Size
1/4"
Price
$32.14
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Part Number
ATI402M-4
Diameter
5/8"
Pilot Hole Size
1/4"
Price
$33.98
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Part Number
ATI402N-4
Diameter
5/8"
Pilot Hole Size
5/16"
Price
$34.00
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Part Number
ATI402Q-4
Diameter
3/4"
Pilot Hole Size
1/4"
Price
$33.66
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Part Number
ATI402R-4
Diameter
3/4"
Pilot Hole Size
5/16"
Price
$34.37
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Part Number
ATI402T-4
Diameter
7/8"
Pilot Hole Size
3/8"
Price
$38.33
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