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 5

• Approved Vendor 15/16" HSS Taper Shank Machine Expansion Reamer SKU 18574 $139.04
• Approved Vendor 15/16" to 1-1/2" Ball Joint Taper Reamer SKU 18580 $133.62
• Approved Vendor 15/16" X 1/2" Pilots for Counterbore SKU 18590 $22.73
• Approved Vendor 15/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore SKU 18591 $59.78
• Approved Vendor 15/16" X 1/4" Pilot Hole HSS Taper Shank Counterbore SKU 18592 $61.53
• Approved Vendor 15/16" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 18604 $67.33
• Approved Vendor 15/16" X 3/8" Pilots for Counterbore SKU 18606 $22.73
• Approved Vendor 15/16" X 5/16" Pilots for Counterbore SKU 18608 $22.73
• Approved Vendor 15/16" X 7/16" Pilots for Counterbore SKU 18613 $22.73
• Approved Vendor 15/32" HSS Straight Flute Hand Reamer SKU 18663 $46.18
• Approved Vendor 15/32" HSS Straight Shank Machine Expansion Reamer SKU 18664 $89.59
• Approved Vendor 15/32" HSS Taper Shank Machine Expansion Reamer SKU 18668 $108.76
• Approved Vendor 15/32" X 1/4" Pilots for Counterbore SKU 18675 $9.71
• Approved Vendor 15/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank SKU 18676 $41.09
• Approved Vendor 15/32" X 1/8" Pilots for Counterbore SKU 18677 $9.71
• Approved Vendor 15/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore SKU 18683 $39.01
• Approved Vendor 15/32" X 3/16" Pilots for Counterbore SKU 18684 $9.71
• Approved Vendor 15/32" X 5/16" Pilots for Counterbore SKU 18687 $9.71
• Approved Vendor 15/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 18737 $35.37
• Approved Vendor 17/32" HSS Straight Flute Hand Expansion Reamer SKU 18842 $168.42
• Approved Vendor 17/32" HSS Straight Flute Hand Reamer SKU 18843 $53.47
• Approved Vendor 17/32" HSS Straight Shank Machine Expansion Reamer SKU 18844 $89.89
• Approved Vendor 17/32" HSS Taper Shank Machine Expansion Reamer SKU 18848 $113.91
• Approved Vendor 17/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank SKU 18854 $47.96
• Approved Vendor 17/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore SKU 18860 $43.36
• Approved Vendor 17/64" HSS Straight Flute Hand Reamer SKU 18894 $32.40
• Approved Vendor 17/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 18906 $35.37
• Approved Vendor 19/32" HSS Straight Flute Hand Expansion Reamer SKU 18998 $182.80
• Approved Vendor 19/32" HSS Straight Flute Hand Reamer SKU 18999 $60.13
• Approved Vendor 19/32" HSS Straight Shank Machine Expansion Reamer SKU 19000 $99.30
• Approved Vendor 19/32" HSS Taper Shank Machine Expansion Reamer SKU 19004 $118.31
• Approved Vendor 19/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank SKU 19010 $52.08
• Approved Vendor 19/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore SKU 19015 $46.26
• Approved Vendor 19/64" HSS Straight Flute Hand Reamer SKU 19049 $32.40
• Approved Vendor 19/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 19061 $36.79
• Alfa Tool 2 X 3/4 HSS 100° Single Flute Countersink SKU CSF50532C $158.40
• Alfa Tool 2 X 3/4 HSS 60° Single Flute Countersink SKU CSF50532A $158.40
• Alfa Tool 2 X 3/4 HSS 82° Single Flute Countersink SKU CSF50532 $158.40
• Alfa Tool 2 X 3/4 HSS 90° Single Flute Countersink SKU CSF50532B $158.40
• Approved Vendor 2" HSS Straight Flute Taper Pipe Reamer SKU 19111 $312.32
• Approved Vendor 2" HSS Straight Shank Machine Expansion Reamer SKU 19112 $392.44
• Approved Vendor 2" X 1/2" Pilot Hole HSS Straight Shank Counterbore SKU 19128 $254.39
• Approved Vendor 2" X 1/2" Pilot Hole HSS Taper Shank Counterbore SKU 19129 $254.07
• Approved Vendor 2"-100 HSS 6 Flute Chatterless Countersink SKU 19140 $285.39
• Approved Vendor 2"-100 HSS Single Flute Countersink SKU 19141 $210.20
• Approved Vendor 2"-100 HSS Single Flute Countersink (2) SKU 19142 $162.15/pack of 2
• Approved Vendor 2"-120 HSS 6 Flute Chatterless Countersink SKU 19148 $285.39
• Approved Vendor 2"-120 HSS Single Flute Countersink SKU 19149 $210.20

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