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System of Measurement System of Measurement |
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Reamer Diameter Reamer Diameter | Show |
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Reamer Diameter Reamer Diameter | Hide |
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Application Application |
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Flute Style Flute Style |
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Straight | Helical Spiral |
Reamer Type Reamer Type |
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Material Material |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Hex Shank Size Hex Shank Size |
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Spiral Direction Spiral Direction |
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Number of Flutes Number of Flutes |
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About Reamers
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Metric Size High-Speed Steel Round-Shank Reamers

The shank diameter is slightly smaller than the reamer diameter.
For technical drawings and 3-D models, click on a part number.
Reamer | Lg. | ||||||||
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Size, mm | Diameter, mm | Flute, mm | Overall, mm | Number of Flutes | Flute Style | Cutting Dia. Tolerance, mm | For Use On | Each | |
High-Speed Steel | |||||||||
21.5 | 21.5000 | 66.7 | 254 | 8 | Straight | 0.0025 to 0.01 | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 0000000 | 000000 |
Hex Nut-Shank Reamers for Hole Alignment with Safety Magnets

Helical Spiral Flute
Magnets on the hex nut hold the reamer in place in your tool and prevent it from accidentally falling when not in the square-drive impact wrench socket. Also known as bridge reamers, car reamers, and aligning reamers, they ream, true, enlarge, align, and debur holes. All have tapered ends for easy entry into misaligned holes. Do not use for reaming tapered holes.
Reamers with helical-spiral flutes create a fine finish and reduce the chance of breakage because they move chips forward, which prevents the chips from packing into the flutes.
Reamer Dia. | Lg. | Direction | |||||||||
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Reamer Size | (A) | (B) | Hex Shank Size | Flute | Overall | Spiral | Cut | Cutting Dia. Tolerance | For Use On | Each | |
High-Speed Steel | |||||||||||
Helical Spiral | |||||||||||
28 mm | 28.0000mm | 21.5000mm | 41mm | 127mm | 178mm | Left Hand | Right Hand | 0mm to 0.254mm | Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel | 00000000 | 0000000 |