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 4

• Approved Vendor 11/64" HSS Straight Flute Hand Reamer SKU 18078 $28.01
• Alfa Tool 13/16 Hex Shank Blitz Car Reamer SKU CRB54572 $100.64
• Alfa Tool 13/16 Hex Shank Car Reamer SKU CR54572 $100.64
• Approved Vendor 13/16" 3MT Straight Flute Car Reamer SKU 18239 $76.94
• Approved Vendor 13/16" HSS 1/2" Straight Shank Bridge Reamer SKU 18251 $97.69
• Approved Vendor 13/16" HSS 3MT Straight Flute Bridge Reamer SKU 18253 $79.67
• Approved Vendor 13/16" HSS Black & Gold 1/2" Straight Shank Bridge Reamer SKU 18255 $111.86
• Approved Vendor 13/16" HSS Black & Gold Hex Shank Long Bridge Reamer SKU 18258 $121.35
• Approved Vendor 13/16" HSS Black & Gold HSS Black & Gold Hex Shank Bridge Reamer SKU 18259 $112.03
• Approved Vendor 13/16" HSS Hex Shank Bridge Reamer SKU 18260 $87.78
• Approved Vendor 13/16" HSS Hex Shank Long Bridge Reamer SKU 18261 $110.32
• Approved Vendor 13/16" HSS Straight Flute Hand Expansion Reamer SKU 18267 $223.22
• Approved Vendor 13/16" HSS Straight Flute Hand Reamer SKU 18268 $78.07
• Approved Vendor 13/16" HSS Straight Shank Machine Expansion Reamer SKU 18270 $110.82
• Approved Vendor 13/16" HSS Taper Shank Machine Expansion Reamer SKU 18274 $117.30
• Approved Vendor 13/16" X 1/2" Pilots for Counterbore SKU 18286 $18.86
• Approved Vendor 13/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore SKU 18287 $54.39
• Approved Vendor 13/16" X 1/4" Pilot Hole HSS Taper Shank Counterbore SKU 18288 $56.04
• Approved Vendor 13/16" X 1/4" Pilots for Counterbore SKU 18289 $18.86
• Approved Vendor 13/16" X 3/16" HSS Aircraft Counterbore 1/4" Shank SKU 18301 $61.21
• Approved Vendor 13/16" X 3/8" Pilots for Counterbore SKU 18304 $18.86
• Approved Vendor 13/16" X 5/16" Pilots for Counterbore SKU 18306 $18.86
• Approved Vendor 13/32" HSS Straight Flute Hand Expansion Reamer SKU 18363 $146.18
• Approved Vendor 13/32" HSS Straight Flute Hand Reamer SKU 18364 $42.51
• Approved Vendor 13/32" HSS Straight Shank Machine Expansion Reamer SKU 18365 $95.25
• Approved Vendor 13/32" HSS Straight Shank Straight Flute Chucking Reamer SKU 18367 $18.73
• Approved Vendor 13/32" HSS Taper Shank Machine Expansion Reamer SKU 18369 $120.33
• Approved Vendor 13/32" X 1/4" Pilots for Counterbore SKU 18377 $9.71
• Approved Vendor 13/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank SKU 18378 $41.54
• Approved Vendor 13/32" X 1/8" Pilots for Counterbore SKU 18379 $9.71
• Approved Vendor 13/32" X 3/16" Pilots for Counterbore SKU 18386 $9.71
• Approved Vendor 13/32" X 3/8" Pilots for Counterbore SKU 18390 $9.71
• Approved Vendor 13/32" X 5/32" Pilot Hole HSS Straight Shank Counterbore SKU 18392 $36.91
• Approved Vendor 13/32" X 5/32" Pilots for Counterbore SKU 18393 $9.71
• Approved Vendor 13/64" X 3/32" Pilot Hole HSS Straight Shank Counterbore SKU 18443 $35.37
• Alfa Tool 15/16 Hex Shank Car Reamer SKU CR54573 $118.22
• Alfa Tool 15/16 HSS Chucking Reamers SKU CR54058 $59.28
• Approved Vendor 15/16" 3MT Straight Flute Car Reamer SKU 18540 $87.30
• Approved Vendor 15/16" HSS 1/2" Straight Shank Bridge Reamer SKU 18551 $111.72
• Approved Vendor 15/16" HSS 3MT Straight Flute Bridge Reamer SKU 18553 $90.41
• Approved Vendor 15/16" HSS Black & Gold 1/2" Straight Shank Bridge Reamer SKU 18555 $129.47
• Approved Vendor 15/16" HSS Black & Gold Hex Shank Long Bridge Reamer SKU 18558 $142.54
• Approved Vendor 15/16" HSS Black & Gold HSS Black & Gold Hex Shank Bridge Reamer SKU 18559 $131.60
• Approved Vendor 15/16" HSS Hex Shank Bridge Reamer SKU 18560 $100.78
• Approved Vendor 15/16" HSS Hex Shank Long Bridge Reamer SKU 18561 $120.17
• Approved Vendor 15/16" HSS Straight Flute Hand Expansion Reamer SKU 18567 $249.71
• Approved Vendor 15/16" HSS Straight Flute Hand Reamer SKU 18568 $94.63
• Approved Vendor 15/16" HSS Straight Shank Machine Expansion Reamer SKU 18570 $131.11

More in Cutting Tools & Machining

• Drill Bits
• Taps & Dies
• End Mills & Inserts
• Hole Saws & Annular Cutters
• Saw Blades
• Other Cutting Tools & Machining