Counterbores - Flat Bottom - Long Reach

Holemaking & Threading
Counterbores - Flat Bottom - Long Reach

Holemaking & Threading

Ideal for castings, rounded parts, or concaved or drafted surfaces, this Harvey Tool product line of Counterbores - Flat Bottom - Long Reach features tooling that can be used for flat bottom reaming or straightening misaligned holes.

  • 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   

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* Tolerance listed above refers to uncoated counterbores. Tolerance for AlTiN coating is +.0002"/-.0005".
CUTTER
DIAMETER
FLUTE
LENGTH
OVERALL
REACH
SHANK
DIAMETER
OVERALL
LENGTH
UNCOATED AlTiN COATED Add to Cart Default Sort
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 $34.50 25431-C3 $39.10 00000001
.0394 (1 mm) 5/32 5/16 1/8 2-1/2 2541M $34.50 2541M-C3 $39.10 00000002
.0469 (3/64) 3/16 3/8 1/8 2-1/2 25447 $34.50 25447-C3 $39.10 00000003
.0625 (1/16) 1/4 1/2 1/8 2-1/2 25462 $34.50 25462-C3 $39.10 00000004
.0781 (5/64) 5/16 5/8 1/8 2-1/2 25478 $34.50 25478-C3 $39.10 00000005
.0787 (2 mm) 5/16 5/8 1/8 2-1/2 2542M $34.50 2542M-C3 $39.10 00000006
.0937 (3/32) 3/8 3/4 1/8 2-1/2 25493 $34.50 25493-C3 $39.10 00000007
.1094 (7/64) 3/8 7/8 1/8 2-1/2 25507 $34.50 25507-C3 $39.10 00000008
.1181 (3 mm) 3/8 1 1/8 2-1/2 2553M $34.50 2553M-C3 $39.10 00000009
.1250 (1/8) 1/2 1 1/8 2-1/2 25508 $34.50 25508-C3 $39.10 00000010
.1406 (9/64) 9/16 1-1/8 3/16 3 25509 $42.00 25509-C3 $47.00 00000011
.1562 (5/32) 5/8 1-1/4 3/16 3 25510 $42.00 25510-C3 $47.00 00000012
.1575 (4 mm) 5/8 1-1/4 3/16 3 2554M $42.00 2554M-C3 $47.00 00000013
.1719 (11/64) 5/8 1-3/8 3/16 3 25511 $42.00 25511-C3 $47.00 00000014
.1875 (3/16) 3/4 1-1/2 3/16 3 25512 $42.00 25512-C3 $47.00 00000015
.1968 (5 mm) 3/4 1-9/16 1/4 4 2555M $58.20 2555M-C3 $66.10 00000016
.2031 (13/64) 3/4 1-5/8 1/4 4 25513 $55.80 25513-C3 $63.70 00000017
.2187 (7/32) 3/4 1-3/4 1/4 4 25514 $55.80 25514-C3 $63.70 00000018
.2344 (15/64) 7/8 1-7/8 1/4 4 25515 $55.80 25515-C3 $63.70 00000019
.2362 (6 mm) 7/8 1-7/8 1/4 4 2556M $58.20 2556M-C3 $66.10 00000020
.2500 (1/4) 7/8 2 1/4 4 25516 $55.80 25516-C3 $63.70 00000021
.2656 (17/64) 7/8 2-1/8 5/16 4 25517 $70.70 25517-C3 $80.20 00000022
.2812 (9/32) 7/8 2-1/4 5/16 4 25518 $70.70 25518-C3 $80.20 00000023
.2969 (19/64) 7/8 2-3/8 5/16 4 25519 $70.70 25519-C3 $80.20 00000024
.3125 (5/16) 1 2-1/2 5/16 4 25520 $70.70 25520-C3 $80.20 00000025
.3150 (8 mm) 1 2-1/2 3/8 4 2558M $91.20 2558M-C3 $103.50 00000026
.3437 (11/32) 1 2-3/4 3/8 4 25522 $85.30 25522-C3 $97.60 00000027
.3750 (3/8) 1 3 3/8 4 25524 $85.30 25524-C3 $97.60 00000028
.3937 (10 mm) 1 3 7/16 4 2550M $106.00 2550M-C3 $119.40 00000029
.4375 (7/16) 1 3 7/16 4 25528 $99.00 25528-C3 $112.40 00000030
.5000 (1/2) 1 3 1/2 4 25532 $121.40 25532-C3 $134.80 00000031

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