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 2

• Approved Vendor 1/2" HSS Straight Flute Hand Expansion Reamer SKU 14533 $156.26
• Approved Vendor 1/2" HSS Straight Flute Hand Reamer SKU 14534 $44.48
• Approved Vendor 1/2" HSS Straight Flute Taper Pipe Reamer SKU 14535 $48.10
• Approved Vendor 1/2" HSS Straight Shank Machine Expansion Reamer SKU 14536 $77.41
• Approved Vendor 1/2" HSS Taper Shank Machine Expansion Reamer SKU 14541 $87.16
• Approved Vendor 1/2" X 1/4" Pilots for Counterbore SKU 14625 $9.71
• Approved Vendor 1/2" X 1/8" HSS Aircraft Counterbore 1/4" Shank SKU 14626 $41.83
• Approved Vendor 1/2" X 1/8" Pilots for Counterbore SKU 14628 $9.71
• Approved Vendor 1/2" X 3/16" Pilot Hole HSS Straight Shank Counterbore SKU 14664 $39.01
• Approved Vendor 1/2" X 3/16" Pilot Hole HSS Taper Shank Counterbore SKU 14665 $38.98
• Approved Vendor 1/2" X 3/16" Pilots for Counterbore SKU 14666 $9.71
• Approved Vendor 1/2" X 3/32" Pilots for Counterbore SKU 14668 $9.71
• Approved Vendor 1/2" X 3/8" Pilots for Counterbore SKU 14675 $9.71
• Approved Vendor 1/2" X 5/16" Pilots for Counterbore SKU 14684 $9.71
• Approved Vendor 1/2" X 5/32" Pilots for Counterbore SKU 14685 $9.71
• Approved Vendor 1/2" X 7/16" Pilots for Counterbore SKU 14700 $9.71
• Approved Vendor 1/2"-100 HSS 3 Flute Center Reamer SKU 14732 $10.55
• Approved Vendor 1/2"-100 HSS 6 Flute Chatterless Countersink SKU 14733 $25.18
• Approved Vendor 1/2"-100 HSS Single Flute Countersink SKU 14734 $14.84
• Approved Vendor 1/2"-100 HSS Single Flute Countersink (2) SKU 14735 $11.45/pack of 2
• Approved Vendor 1/2"-120 HSS 3 Flute Center Reamer SKU 14738 $10.55
• Approved Vendor 1/2"-120 HSS 6 Flute Chatterless Countersink SKU 14739 $25.18
• Approved Vendor 1/2"-120 HSS Single Flute Countersink SKU 14740 $14.84
• Approved Vendor 1/2"-120 HSS Single Flute Countersink (2) SKU 14741 $11.45/pack of 2
• Approved Vendor 1/2"-60 HSS 3 Flute Center Reamer SKU 15091 $10.55
• Approved Vendor 1/2"-60 HSS 6 Flute Chatterless Countersink SKU 15093 $15.53
• Approved Vendor 1/2"-60 HSS Single Flute Countersink SKU 15094 $14.84
• Approved Vendor 1/2"-60 HSS Single Flute Countersink (2) SKU 15095 $11.45/pack of 2
• Approved Vendor 1/2"-82 1/4" Shank HSS 3 Flute Center Reamer SKU 15097 $10.55
• Approved Vendor 1/2"-82 3/8" Shank HSS 3 Flute Center Reamer SKU 15098 $10.55
• Approved Vendor 1/2"-82 HSS 6 Flute Chatterless Countersink SKU 15100 $15.53
• Approved Vendor 1/2"-82 HSS Single Flute Countersink SKU 15101 $14.84
• Approved Vendor 1/2"-82 HSS Single Flute Countersink (2) SKU 15102 $11.45/pack of 2
• Approved Vendor 1/4" HSS Straight Flute Hand Expansion Reamer SKU 16080 $129.94
• Approved Vendor 1/4" HSS Straight Flute Hand Reamer SKU 16081 $29.11
• Approved Vendor 1/4" HSS Straight Flute Taper Pipe Reamer SKU 16082 $34.05
• Approved Vendor 1/4" HSS Straight Shank Machine Expansion Reamer SKU 16083 $98.37
• Approved Vendor 1/4" X 3/16" Pilots for Counterbore SKU 16172 $8.04
• Approved Vendor 1/4" X 3/32" HSS Aircraft Counterbore 1/4" Shank SKU 16173 $35.98
• Approved Vendor 1/4" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 16174 $33.20
• Approved Vendor 1/4" X 3/32" Pilot Hole HSS Taper Shank Counterbore SKU 16175 $34.83
• Approved Vendor 1/4" X 3/32" Pilots for Counterbore SKU 16176 $8.04
• Approved Vendor 1/4" X 5/32" Pilots for Counterbore SKU 16210 $8.04
• Approved Vendor 1/4"-100 HSS 3 Flute Center Reamer SKU 16235 $7.27
• Approved Vendor 1/4"-100 HSS 6 Flute Chatterless Countersink SKU 16236 $13.73
• Approved Vendor 1/4"-100 HSS Single Flute Countersink SKU 16237 $10.18
• Approved Vendor 1/4"-100 HSS Single Flute Countersink (2) SKU 16238 $7.85/pack of 2
• Approved Vendor 1/4"-120 HSS 3 Flute Center Reamer SKU 16239 $7.27

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