Countersinks, Reamers & Burs
500+ products
Expected delivery: Wed, Nov 18
These tools finish a hole or edge after drilling. Countersinks cut a cone so flat head screws sit flush and also break sharp edges. Reamers bring a drilled hole to an exact size with a smooth finish for pins, bushings and shafts. Carbide burs shape, deburr and port metal in a die grinder. This section includes single flute, multi-flute and zero flute countersinks, chucking reamers, hand reamers and adjustable reamers, carbide burs in common shapes and cuts, and hand deburring tools.
What to check before you order
- Countersink angle. Match the screw head. Inch flat head screws generally use 82 degrees, metric flat heads use 90 degrees, and some aircraft fasteners use 100 degrees.
- Reamer allowance. Drill the hole slightly under the finished size before reaming. Reamers remove only a small amount of stock.
- Bur shape and cut. Cylinder, ball, tree and flame shapes reach different areas. Double cut burs leave smaller chips and a smoother finish on steel. Single cut suits hard steel and general stock removal.
- Shank and speed. Most burs have a 1/4" or 1/8" shank. Stay within the bur maker's speed rating and wear eye protection.
Browse drill bits, end mills and inserts, Alfa Tool countersinks and reamers, or all cutting tools.
Common questions
What is the difference between a chucking reamer and a hand reamer?
A chucking reamer runs in a drill press, lathe or mill at reduced speed. A hand reamer has a square end for a tap wrench and a longer tapered lead so it can start straight by hand.
Can carbide burs be used on aluminum?
Yes, but standard cuts can clog with soft metal. Aluminum-cut burs have coarse, widely spaced flutes that clear chips better on nonferrous metals. Follow the bur maker's speed guidance and wear eye protection.
Countersinks, Reamers & Burs: page 6
- Approved Vendor 2"-120 HSS Single Flute Countersink (2) SKU 19150 $162.15/pack of 2
- Approved Vendor 2"-60 HSS 6 Flute Chatterless Countersink SKU 19156 $182.55
- Approved Vendor 2"-60 HSS Single Flute Countersink SKU 19157 $210.20
- Approved Vendor 2"-60 HSS Single Flute Countersink (2) SKU 19158 $162.15/pack of 2
- Approved Vendor 2"-82 HSS 4 Flute Machine Countersink SKU 19162 $191.33
- Approved Vendor 2"-82 HSS 6 Flute Chatterless Countersink SKU 19163 $182.55
- Approved Vendor 2"-82 HSS Single Flute Countersink SKU 19164 $210.20
- Approved Vendor 2"-82 HSS Single Flute Countersink (2) SKU 19165 $162.15/pack of 2
- Approved Vendor 2"-90 HSS 6 Flute Chatterless Countersink SKU 19166 $182.55
- Approved Vendor 2"-90 HSS Single Flute Countersink SKU 19167 $210.20
- Approved Vendor 2"-90 HSS Single Flute Countersink (2) SKU 19168 $162.15/pack of 2
- Approved Vendor 2-1/2" X 1/2" Pilot Hole HSS Straight Shank Counterbore SKU 19196 $402.09
- Approved Vendor 2-1/2" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19197 $416.20
- Approved Vendor 2-1/4" X 1/2" Pilot Hole HSS Straight Shank Counterbore SKU 19218 $351.89
- Approved Vendor 2-1/4" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19219 $364.23
- Approved Vendor 2-1/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19238 $342.00
- Approved Vendor 2-3/4" X 1/2" Pilot Hole HSS Straight Shank Counterbore SKU 19276 $525.21
- Approved Vendor 2-3/4" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19277 $543.64
- Approved Vendor 2-3/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19290 $390.92
- Approved Vendor 2-5/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19318 $512.96
- Approved Vendor 2-7/8" X 1/2" Pilot Hole HSS Straight Shank Counterbore SKU 19337 $546.45
- Approved Vendor 2-7/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19338 $565.62
- Approved Vendor 2/A HSS Adjustable Reamer 7/16" - 15/32" SKU 19383 $41.07
- Approved Vendor 21/32" HSS Straight Flute Hand Expansion Reamer SKU 19461 $192.80
- Approved Vendor 21/32" HSS Straight Flute Hand Reamer SKU 19462 $65.27
- Approved Vendor 21/32" HSS Straight Shank Machine Expansion Reamer SKU 19463 $98.35
- Approved Vendor 21/32" HSS Taper Shank Machine Expansion Reamer SKU 19467 $109.21
- Approved Vendor 21/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 19477 $56.81
- Approved Vendor 21/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore SKU 19478 $51.11
- Approved Vendor 21/64" HSS Straight Flute Hand Reamer SKU 19512 $37.56
- Approved Vendor 21/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 19524 $38.06
- Approved Vendor 23/32" HSS Straight Flute Hand Expansion Reamer SKU 19577 $213.17
- Approved Vendor 23/32" HSS Straight Flute Hand Reamer SKU 19578 $70.11
- Approved Vendor 23/32" HSS Straight Shank Machine Expansion Reamer SKU 19579 $105.17
- Approved Vendor 23/32" HSS Taper Shank Machine Expansion Reamer SKU 19583 $117.03
- Approved Vendor 23/32" X 1/4" Pilot Hole HSS Straight Shank Counterbore SKU 19589 $53.15
- Approved Vendor 23/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 19594 $59.80
- Approved Vendor 23/64" HSS Straight Flute Hand Reamer SKU 19628 $37.56
- Approved Vendor 23/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 19640 $38.06
- Approved Vendor 25/32" HSS Straight Flute Hand Reamer SKU 19701 $78.07
- Approved Vendor 25/32" HSS Straight Shank Machine Expansion Reamer SKU 19702 $106.80
- Approved Vendor 25/32" HSS Taper Shank Machine Expansion Reamer SKU 19706 $122.02
- Approved Vendor 25/32" X 1/4" Pilot Hole HSS Straight Shank Counterbore SKU 19710 $56.11
- Approved Vendor 25/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 19714 $63.21
- Approved Vendor 25/64" X 5/32" Pilot Hole HSS Straight Shank Counterbore SKU 19766 $39.04
- Alfa Tool 27/32 HSS Chucking Reamers SKU CR54052 $53.66
- Approved Vendor 27/32" HSS Straight Flute Hand Reamer SKU 19808 $82.77
- Approved Vendor 27/32" HSS Straight Shank Machine Expansion Reamer SKU 19809 $116.82