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.

Popular countersinks, reamers & burs

• Ridgid #73 Deburring Tool SKU LS-00574781-9 $67.07
• Alfa Tool 1 1/16 Hex Shank Car Reamer SKU CR54574 $151.86
• Alfa Tool 1" HSS Chucking Reamer SKU CR54062 $65.32
• Alfa Tool 1-1/16 Hex Shank Blitz Car Reamer SKU CRB54574 $151.86
• Alfa Tool 1-1/16 HSS Chucking Reamers SKU CR54064 $76.98
• Alfa Tool 1-1/2 HSS Chucking Reamers SKU CR54078 $143.28
• Alfa Tool 1-1/2 X 3/4 HSS 100° Single Flute Countersink SKU CSF50531C $93.50
• Alfa Tool 1-1/2 X 3/4 HSS 60° Single Flute Countersink SKU CSF50531A $93.50
• Alfa Tool 1-1/2 X 3/4 HSS 82° Single Flute Countersink SKU CSF50531 $93.50
• Alfa Tool 1-1/2 X 3/4 HSS 90° Single Flute Countersink SKU CSF50531B $93.50
• Alfa Tool 1-1/4 HSS Chucking Reamers SKU CR54070 $101.94
• Alfa Tool 1-1/4 X 1/2 HSS 82° Single Flute Usa Countersink SKU CSF15009 $136.46
• Alfa Tool 1-1/4 X 3/4 HSS 100° Single Flute Countersink SKU CSF50530C $69.24
• Alfa Tool 1-1/4 X 3/4 HSS 60° Single Flute Countersink SKU CSF50530A $69.24
• Alfa Tool 1-1/4 X 3/4 HSS 82° Single Flute Countersink SKU CSF50530 $69.24
• Alfa Tool 1-1/4 X 3/4 HSS 90° Single Flute Countersink SKU CSF50530B $69.24
• Alfa Tool 1-1/8 HSS Chucking Reamers SKU CR54066 $82.12
• Alfa Tool 1-11/16 HSS Chucking Reamers SKU CR54084 $190.18
• Alfa Tool 1-3/16 Hex Shank Blitz Car Reamer SKU CRB54575 $188.02
• Alfa Tool 1-3/16 Hex Shank Car Reamer SKU CR54575 $188.02
• Alfa Tool 1-3/16 HSS Chucking Reamers SKU CR54068 $92.66
• Alfa Tool 1-3/4 HSS Chucking Reamers SKU CR54086 $197.28
• Alfa Tool 1-3/8 HSS Chucking Reamers SKU CR54074 $122.26
• Alfa Tool 1-5/16 Hex Shank Blitz Car Reamer SKU CRB54576 $219.54
• Alfa Tool 1-5/16 Hex Shank Car Reamer SKU CR54576 $219.54
• Alfa Tool 1-5/16 HSS Chucking Reamers SKU CR54072 $117.98
• Alfa Tool 1-5/8 HSS Chucking Reamers SKU CR54082 $171.56
• Alfa Tool 1-7/16 HSS Chucking Reamers SKU CR54076 $146.32
• Approved Vendor 1-7/16" X 3/8" Pilot Hole HSS Straight Shank Counterbore SKU 13613 $134.37
• Approved Vendor 1-7/16" X 3/8" Pilot Hole HSS Taper Shank Counterbore SKU 13614 $134.24
• Approved Vendor 1-7/32" HSS Straight Shank Machine Expansion Reamer SKU 13620 $210.64
• Approved Vendor 1-7/32" HSS Taper Shank Machine Expansion Reamer SKU 13621 $220.80
• Alfa Tool 1-7/8 HSS Chucking Reamers SKU CR54090 $210.36
• Approved Vendor 1-7/8" HSS 4MT Straight Flute Bridge Reamer SKU 13643 $448.20
• Approved Vendor 1-7/8" HSS Straight Shank Machine Expansion Reamer SKU 13648 $343.63
• Approved Vendor 1-7/8" HSS Taper Shank Machine Expansion Reamer SKU 13649 $380.41
• Approved Vendor 1-7/8" X 7/16" Pilot Hole HSS Straight Shank Counterbore SKU 13658 $220.84
• Approved Vendor 1-7/8" X 7/16" Pilot Hole HSS Taper Shank Counterbore SKU 13659 $220.59
• Alfa Tool 1-9/16 HSS Chucking Reamers SKU CR54080 $162.62
• Approved Vendor 1-9/16" HSS 4MT Straight Flute Bridge Reamer SKU 13706 $352.34
• Approved Vendor 1-9/16" HSS Straight Shank Machine Expansion Reamer SKU 13711 $280.64
• Approved Vendor 1-9/16" HSS Taper Shank Machine Expansion Reamer SKU 13712 $310.41
• Approved Vendor 1-9/16" X 7/16" Pilot Hole HSS Straight Shank Counterbore SKU 13719 $186.61
• Approved Vendor 1-9/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore SKU 13720 $186.30
• Approved Vendor 1/16" HSS Straight Flute Taper Pipe Reamer SKU 13812 $26.75
• Approved Vendor 1/2" HSS 1/2" Straight Shank Bridge Reamer SKU 14497 $57.61
• Approved Vendor 1/2" HSS 2MT Straight Flute Bridge Reamer SKU 14500 $48.03
• Approved Vendor 1/2" HSS Black & Gold Straight Shank Bridge Reamer SKU 14509 $60.48

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