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 12

• Alfa Tool Asa # 2 x 4 HSS Combined Drill & Countersink SKU CD50473 $11.24
• Alfa Tool Asa # 2 x 5 HSS Combined Drill & Countersink SKU CD50474 $14.20
• Alfa Tool Asa # 3 x 4 HSS Combined Drill & Countersink SKU CD50475 $11.88
• Alfa Tool Asa # 3 x 5 HSS Combined Drill & Countersink SKU CD50476 $15.46
• Alfa Tool Asa # 4 x 4 HSS Combined Drill & Countersink SKU CD50477 $12.92
• Alfa Tool Asa # 4 x 5 HSS Combined Drill & Countersink SKU CD50478 $16.52
• Alfa Tool Asa # 6 HSS Combined Drill & Countersink SKU CDH50456 $8.58
• Approved Vendor B HSS Adjustable Reamer 17/32" - 19/32" SKU 31010 $43.80
• Approved Vendor C HSS Adjustable Reamer 19/32" - 21/32" SKU 31007 $45.57
• Approved Vendor D HSS Adjustable Reamer 21/32" - 23/32" SKU 31011 $47.66
• Approved Vendor E HSS Adjustable Reamer 23/32" - 25/32" SKU 31006 $50.05
• Approved Vendor F HSS Adjustable Reamer 25/32" - 27/32" SKU 31005 $51.50
• Alfa Tool FGR-7B Fiber Glass Router Burr End SKU B71717B $55.14
• Alfa Tool FGR-8B Fiber Glass Router Burr End SKU B71719B $70.04
• Alfa Tool FGR-9B Fiber Glass Router Burr End SKU B71721B $88.02
• Approved Vendor G HSS Adjustable Reamer 27/32" - 15/16" SKU 31002 $54.54
• Approved Vendor H HSS Adjustable Reamer 15/16" - 1-1/16" SKU 31009 $57.45
• Approved Vendor I HSS Adjustable Reamer 1-1/16" - 1-3/16" SKU 30999 $75.09
• Approved Vendor J HSS Adjustable Reamer 1-3/16" - 1-11/32" SKU 31001 $89.44
• Approved Vendor K HSS Adjustable Reamer 1-11/32" - 1-1/2" SKU 31004 $107.93
• Approved Vendor L HSS Adjustable Reamer 1-1/2" - 1-13/16" SKU 31000 $158.44
• Approved Vendor M HSS Adjustable Reamer 1-13/16" - 2-7/32" SKU 30997 $215.69
• Approved Vendor N HSS Adjustable Reamer 2-7/32" - 2-3/4" SKU 31003 $364.39
• Approved Vendor O HSS Adjustable Reamer 2-3/4" - 3-11/32" SKU 30998 $495.25
• Approved Vendor P HSS Straight Shank Straight Flute Chucking Reamer SKU 31789 $16.83
• DeWalt Pipe Deburring Tool Replacement Blades SKU 115-DCE7101 $49.02
• Alfa Tool SC-7NFR Carbide Burr Alumacut Cylindrcal Radius End 3/8 Shank SKU B71230BA $83.74
• Alfa Tool SC-9 Carbide Burr Cylindrical Radius Double Cut SKU B71231D $76.56
• Alfa Tool SC-9 Carbide Burr Cylindrical Radius Single Cut SKU B71231 $76.56
• Alfa Tool SD-9 Carbide Burr Ball Double Cut SKU B71249D $61.42
• Alfa Tool SD-9 Carbide Burr Ball Double Cut Tin Coated SKU B71249DTN $80.46
• Alfa Tool SD-9 Carbide Burr Ball Single Cut SKU B71249 $61.42
• Alfa Tool Se-7 Carbide Burr Oval Double Cut Tin Coated SKU B71218DTN $58.32
• Alfa Tool Se-7NF Carbide Burr Alumacut Oval SKU B71218A $66.08
• Lenox Seamer SKU 433-LXHT14350 $56.42
• Alfa Tool SF-14NF Carbide Burr Alumacut Tree Radius SKU B71258A $59.56
• Alfa Tool SF-7NF Carbide Burr Alumacut Tree Radius SKU B71257A $59.56
• Alfa Tool SJ-9 Carbide Burr 60° Cone Double Cut SKU B71316D $60.32
• Alfa Tool SJ-9 Carbide Burr 60° Cone Double Cut Tin Coated SKU B71316DTN $79.32
• Alfa Tool SK-9 Carbide Burr 90° Cone Double Cut SKU B71326D $59.16
• Irwin Tapered Countersink 4PCSET SKU 585-1882793 $47.04

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