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Adjustable Counterbores

Adjustable Counterbores allow you to drill cylidrical flat-bottomed holes while adjusting the depth of cut of the center drill.  Choose from a great selection of Adjustable counterbore drills in carbide tipped or high speed steel.  If you don't see the size of the Adjustable counterbore you need, give us a call at 800-346-8274.  We may have other options other than what is available online.

 

 

Carbide Tipped Adjustable Counter bore with shank size same as center drill

*Center drills are sold separately

drills-123hss.jpg

Counterbore DiameterCenter Drill Hole DiameterOverall LengthPart #
1-3/8" 7/16" 2" HS123CT-138716

 

 

High Speed Steel Adjustable Counter bore with shank size same as center drill

*Center drills are sold seperately

drills-123hss.jpg

Counterbore DiameterCenter Drill Hole DiameterOverall LengthPart #
3/8" 3/16" 1 1/2" HS123-62301
1/2" 1/4" 1 1/2" HS123-62304
3/4" 1/4" 2" HS123-62307
3/4" 5/16" 2" HS123-62308
7/8" 5/16" 2" HS123-62309
7/8" 3/8" 2" HS123-62310
7/8" 7/16" 2" HS123-62311
1" 5/16" 2" HS123-62312
1" 3/8" 2" HS123-62313
1" 7/16" 2" HS123-62313-716
1" 1/2" 2" HS123-62314
1-1/4" 1/2" 2" HS123-62316
1-1/2" 1/2" 2" HS123-62318

 

 

High Speed Steel Adjustable Counterbore, 1/2" Shank

hs122-high-speed-steel-counterbore-sm.jpg

 

Counterbore DiameterInside DiameterTwist lengthOverall LengthPart #
3/8" 1/8" 2-1/2" 4-1/2" HS122-62261
3/8" 5/32" 2-1/2" 4-1/2" HS122-62262
3/8" 3/16" 2-1/2" 4-1/2" HS122-62263
1/2" 3/16" 2-1/2" 4-1/2" HS122-62268
1/2" 7/32" 2-1/2" 4-1/2" HS122-62269
1/2" 1/4" 2-1/2" 4-1/2" HS122-62270
5/8" 3/16" 2-1/2" 4-1/2" HS122-62273
5/8" 5/16" 2-1/2" 4-1/2" HS122-62276
3/4" 3/16" 2-1/2" 4-1/2" HS122-62277
3/4" 5/16" 2-1/2" 4-1/2" HS122-62280
3/4" 3/8" 2-1/2" 4-1/2" HS122-62281
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