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Counterbores - Flat Bottom Long Reach

Photo is an illustration of an exemplary tool

Carbide Counterbores - Flat Bottom Long Reach

  • Undersized neck to avoid heeling
  • Flat Bottom (No Dish) design allows spot facing or counterboring on irregular surfaces
  • Ideal for castings, rounded parts, concaved or drafted surfaces
  • Can be used for flat bottom reaming or straightening misaligned holes
  • Center cutting
  • Ground with full cylidrical margin (not side cutting)
  • 15° Helix
  • 4 Flutes
  • Solid carbide
  • CNC ground in the USA   

   Learn more about the features, benefits, and applications of Harvey Tool Holemaking Solutions

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Below are downloadable Simulation Files in DXF format (half-round line drawings) to accompany Harvey Tool products. Each file is specifically scaled to the geometry of the tool to help simulate running parameters and create tool paths. Like our speeds & feeds charts, these files will be continuously updated with the introduction of new products and new catalogs to assist operating the majority of our tools. Simulation files can also be accessed by searching for a specific tool number on the left-hand side of the website and then clicking on the Simulation table in the product table.
Please don’t hesitate to contact our tech team with any questions at 800-645-5609 or tech@harveytool.com.

To navigate between folders or download a file, DOUBLE CLICK on the folder or file.

  • AlTiN
  • Uncoated
CUTTER
DIAMETER
FLUTE
LENGTH
OVERALL
REACH
SHANK
DIAMETER
OVERALL
LENGTH
UNCOATED AlTiN COATED
D1 +.0000"/-.0005"* L2 +.030"/-.000" L3 +.030"/-.000" D2 L1 4 FL PRICE 4 FL PRICE
.0312 (1/32) 1/8 1/4 1/8 2-1/2 25431 32.40 25431-C3 36.60
.0394 (1 mm) 5/32 5/16 1/8 2-1/2 2541M 32.40 2541M-C3 36.60
.0469 (3/64) 3/16 3/8 1/8 2-1/2 25447 32.40 25447-C3 36.60
.0625 (1/16) 1/4 1/2 1/8 2-1/2 25462 32.40 25462-C3 36.60
.0781 (5/64) 5/16 5/8 1/8 2-1/2 25478 32.40 25478-C3 36.60
.0787 (2 mm) 5/16 5/8 1/8 2-1/2 2542M 32.40 2542M-C3 36.60
.0937 (3/32) 3/8 3/4 1/8 2-1/2 25493 32.40 25493-C3 36.60
.1094 (7/64) 3/8 7/8 1/8 2-1/2 25507 32.40 25507-C3 36.60
.1181 (3 mm) 3/8 1 1/8 2-1/2 2553M 32.40 2553M-C3 36.60
.1250 (1/8) 1/2 1 1/8 2-1/2 25508 32.40 25508-C3 36.60
.1406 (9/64) 9/16 1-1/8 3/16 3 25509 39.40 25509-C3 43.90
.1562 (5/32) 5/8 1-1/4 3/16 3 25510 39.40 25510-C3 43.90
.1575 (4 mm) 5/8 1-1/4 3/16 3 2554M 39.40 2554M-C3 43.90
.1719 (11/64) 5/8 1-3/8 3/16 3 25511 39.40 25511-C3 43.90
.1875 (3/16) 3/4 1-1/2 3/16 3 25512 39.40 25512-C3 43.90
.1968 (5 mm) 3/4 1-9/16 1/4 4 2555M 54.70 2555M-C3 61.90
.2031 (13/64) 3/4 1-5/8 1/4 4 25513 52.40 25513-C3 59.60
.2187 (7/32) 3/4 1-3/4 1/4 4 25514 52.40 25514-C3 59.60
.2344 (15/64) 7/8 1-7/8 1/4 4 25515 52.40 25515-C3 59.60
.2362 (6 mm) 7/8 1-7/8 1/4 4 2556M 54.70 2556M-C3 61.90
.2500 (1/4) 7/8 2 1/4 4 25516 52.40 25516-C3 59.60
.2656 (17/64) 7/8 2-1/8 5/16 4 25517 66.40 25517-C3 75.10
.2812 (9/32) 7/8 2-1/4 5/16 4 25518 66.40 25518-C3 75.10
.2969 (19/64) 7/8 2-3/8 5/16 4 25519 66.40 25519-C3 75.10
.3125 (5/16) 1 2-1/2 5/16 4 25520 66.40 25520-C3 75.10
.3150 (8 mm) 1 2-1/2 3/8 4 2558M 85.60 2558M-C3 96.80
.3437 (11/32) 1 2-3/4 3/8 4 25522 80.10 25522-C3 91.30
.3750 (3/8) 1 3 3/8 4 25524 80.10 25524-C3 91.30
.3937 (10 mm) 1 3 7/16 4 2550M 99.50 2550M-C3 111.70
.4375 (7/16) 1 3 7/16 4 25528 92.90 25528-C3 105.10
.5000 (1/2) 1 3 1/2 4 25532 113.90 25532-C3 126.10
* Tolerance listed above refers to uncoated counterbores. Tolerance for AlTiN coating is +.0002"/−.0005".

Speeds & Feeds

Below you will find downloadable and printer-friendly Speeds & Feeds for this product line. All posted Speed & Feed parameters are suggested starting values that may be increased given optimal setup conditions. If you can't find the information you're looking for, Harvey Tool has a team of technical experts available to assist you. Please contact us at 800-645-5609 or tech@harveytool.com.

Counterbores

Counterbores - Flat Bottom Long Reach

 

Why use a COUNTERBORE vs. an END MILL? 

  • Flat Bottom: Avoids traditional dish left by end mill. Spots effectively on irregular surfaces; Avoids walking as is common with spot drills or drills. 
  • Full Cylindrical Margin & Back Taper: Not side cutting. Will not grab and deflect like an endmill, holding its position better. Reduces chatter and machining marks, improving finish.
  • Slow Helix with Low Rake: Avoids part engagement helping to control finish.

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