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 8
- Approved Vendor 3/4" X 1/2" Pilots for Counterbore SKU 20867 $16.77
- Approved Vendor 3/4" X 1/4" Pilot Hole HSS Straight Shank Counterbore SKU 20869 $53.15
- Approved Vendor 3/4" X 1/4" Pilot Hole HSS Taper Shank Counterbore SKU 20870 $53.07
- Approved Vendor 3/4" X 1/4" Pilots for Counterbore SKU 20871 $16.77
- Approved Vendor 3/4" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 20899 $59.83
- Approved Vendor 3/4" X 3/16" Pilots for Counterbore SKU 20901 $16.77
- Approved Vendor 3/4" X 3/8" Pilots for Counterbore SKU 20919 $16.77
- Approved Vendor 3/4" X 5/16" Pilots for Counterbore SKU 20923 $16.77
- Approved Vendor 3/4" X 7/16" Pilots for Counterbore SKU 20935 $16.77
- Approved Vendor 3/4"-100 HSS 3 Flute Center Reamer SKU 21013 $24.33
- Approved Vendor 3/4"-100 HSS 6 Flute Chatterless Countersink SKU 21014 $49.61
- Approved Vendor 3/4"-100 HSS Single Flute Countersink SKU 21015 $28.18
- Approved Vendor 3/4"-100 HSS Single Flute Countersink (2) SKU 21016 $21.74/pack of 2
- Approved Vendor 3/4"-60 HSS 3 Flute Center Reamer SKU 21164 $24.33
- Approved Vendor 3/4"-60 HSS 6 Flute Chatterless Countersink SKU 21166 $33.75
- Approved Vendor 3/4"-60 HSS Single Flute Countersink SKU 21167 $28.18
- Approved Vendor 3/4"-60 HSS Single Flute Countersink (2) SKU 21168 $21.74/pack of 2
- Approved Vendor 3/4"-82 1/2" Shank HSS 3 Flute Center Reamer SKU 21169 $24.33
- Approved Vendor 3/4"-82 HSS 4 Flute Machine Countersink SKU 21170 $34.41
- Approved Vendor 3/4"-82 HSS 6 Flute Chatterless Countersink SKU 21171 $33.75
- Approved Vendor 3/4"-82 HSS Single Flute Countersink SKU 21172 $28.18
- Approved Vendor 3/4"-82 HSS Single Flute Countersink (2) SKU 21173 $21.74/pack of 2
- Approved Vendor 3/4"-90 HSS 3 Flute Center Reamer SKU 21174 $24.33
- Approved Vendor 3/4"-90 HSS 6 Flute Chatterless Countersink SKU 21175 $33.75
- Approved Vendor 3/4"-90 HSS Single Flute Countersink SKU 21176 $28.18
- Approved Vendor 3/4"-90 HSS Single Flute Countersink (2) SKU 21177 $21.74/pack of 2
- Approved Vendor 3/8" HSS Black & Gold Straight Shank Bridge Reamer SKU 22170 $49.56
- Approved Vendor 3/8" HSS Straight Flute Hand Expansion Reamer SKU 22192 $138.07
- Approved Vendor 3/8" HSS Straight Flute Hand Reamer SKU 22193 $36.79
- Approved Vendor 3/8" HSS Straight Flute Taper Pipe Reamer SKU 22194 $36.28
- Approved Vendor 3/8" HSS Straight Shank Bridge Reamer SKU 22195 $48.69
- Approved Vendor 3/8" HSS Straight Shank Machine Expansion Reamer SKU 22196 $81.45
- Approved Vendor 3/8" HSS Taper Shank Machine Expansion Reamer SKU 22201 $91.19
- Approved Vendor 3/8" X 1/4" Pilots for Counterbore SKU 22255 $8.65
- Approved Vendor 3/8" X 1/8" Pilots for Counterbore SKU 22257 $8.65
- Approved Vendor 3/8" X 3/16" Pilots for Counterbore SKU 22293 $8.65
- Approved Vendor 3/8" X 3/32" HSS Aircraft Counterbore 1/4" Shank SKU 22294 $37.85
- Approved Vendor 3/8" X 3/32" Pilots for Counterbore SKU 22296 $8.65
- Approved Vendor 3/8" X 5/16" Pilots for Counterbore SKU 22326 $8.65
- Approved Vendor 3/8" X 5/32" Pilot Hole HSS Straight Shank Counterbore SKU 22327 $34.86
- Approved Vendor 3/8" X 5/32" Pilot Hole HSS Taper Shank Counterbore SKU 22328 $35.87
- Approved Vendor 3/8" X 5/32" Pilots for Counterbore SKU 22329 $8.65
- Approved Vendor 3/8"-100 HSS 3 Flute Center Reamer SKU 22365 $8.67
- Approved Vendor 3/8"-100 HSS 6 Flute Chatterless Countersink SKU 22366 $19.74
- Approved Vendor 3/8"-100 HSS Single Flute Countersink SKU 22367 $11.61
- Approved Vendor 3/8"-100 HSS Single Flute Countersink (2) SKU 22368 $8.95/pack of 2
- Approved Vendor 3/8"-120 HSS 3 Flute Center Reamer SKU 22370 $8.67
- Approved Vendor 3/8"-120 HSS 6 Flute Chatterless Countersink SKU 22371 $19.74