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Size Units:
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Your choices are...
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English / Fractional
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Drill is designed with base units of inches or fractions of an inch.
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Metric
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Drill is designed with metric base units such as millimeters or centimeters.
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Wire Gauge
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Drills frequently are made in standard wire gauge sizes, designated 1 to 80.
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Letter Size
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Drill sets in standard letter designation sizes from A to Z.
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Other
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Other unlisted size series or units.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Cutting Diameter:
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Full tool cutting diameter.
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Search Logic:
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User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Drill Type
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Your choices are...
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Standard / Twist Drill
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Most common drill type, with end-cutting edges and flutes for chip evacuation. Standard sizes include all common English and metric sizes, wire gauge and number / letter designations.
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Jobber Length Drill
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Common industrial drill configuration, with somewhat longer flutes and overall length than standard twist drills.
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Taper Length Drill
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Somewhat longer flutes than a jobber drill; suitable for general industrial use. Other terms for these length drills include long jobbers and long series drills.
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Extension / Extra Length
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Extra cutting flute length for deeper hole capability.
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Screw Machine Drill
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Shorter flute and overall length than standard drills for increased rigidity.
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Spotting Drill
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Used for initiating a drilled hole; features such as a chisel point prevent walking. Often used to create a drill center for a longer drill such as a jobber or extension drill.
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Center Drill
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Short, rigid drill used for the creation of a flared hole used as a center for turning or other subsequent operations; frequently can include a combined countersink.
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Microdrill
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Very small diameter drills, approximately in the range 0.002" to 0.020". Microdrills often have shank diameters larger than the drill diameter for chucking rigidity.
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Gundrill
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Specialized drill for producing deep holes; typically incorporates coolant channels for smooth cutting and good surface finish.
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Core Drill
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Drill designed to capture a core of the material being drilled; cutting edges are peripheral, and the core is capture inside the cutting circle.
In machining operations, core drill can also refer to a three- or four-flute drill used as a hole-finishing cutter.
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Spade Drill
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End-cutting drill with a flat or square end, often configured as a holder with one or more inserts. Spade drill may be used for deep holes in horizontal cutting; not as efficient for chip removal as some other drills in vertical drilling.
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Step Drill
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Drill with incrementally increasing diameter steps.
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Silver & Deming Drill
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Silver and deming drills are general purpose drills with a reduced shank to fit into a standard chuck, typically 1/2". Often used for portable drills with standard chuck capacities. All S&D drills are 6" long with a 3" flute length. Alternate terms are blacksmith drills or prentice drills.
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Forstner Drill Bit
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Drill bit primarily used in woodworking to create a flat-bottomed hole. Its guidance by "spurs" on its periphery allows for cutting at high angles to the workpiece surface.
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Taper Drill
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Drill with tapered sides, which cuts a larger hole the deeper the drill is fed. Used for industrial drilling in sheet materials.
"Taper drill" can also refer to specialized drills for rotary hammers used in rock drilling; these have standardized taper shanks rather than tapered cutting edges.
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High Helix Drill
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Drill whose flutes have a higher helical flute angle than standard drill series.
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Masonry Drill Bit
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Drill bit used for cutting holes in materials such as concrete, mortar, bricks, and soft stone. Usually has a chisel-type tip for high rigidity at the cutting tip.
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Surgical / Dental Drill
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Specialized drill for surgical or dental applications.
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Hole Saw
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Drill with a circular cutting profile; exterior circle is cut out, and inner material is removed. Often has a centering drill for hole placement.
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Wood Bit
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Drill specifically designed for drilling wood.
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Combination Drill / Countersink
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Drill with an angled shoulder to provide a clearance hole and countersink in one cutting operation; used for flat head screw holes.
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Combination Drill / Counterbore
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Drill with a square cutting shoulder to provide a clearance hole and counterbore in one cutting operation; used for applications such as socket head cap screw holes.
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Combination Drill / Tap
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Combination of a pilot drill and cutting tap on one drill bit. Threaded hole is cut in one operation.
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Drill Blank
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Blank for grinding standard or specialized cutting edges and flute geometry.
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Other
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Other unlisted, specialized, or proprietary drill bit type.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Rotation:
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Your choices are...
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Right Hand
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Most common; designed to cut while turning clockwise.
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Left Hand
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Designed to cut while turning counterclockwise.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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NAS Specifications?
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Manufactured in accordance with National Aerospace Standards (NAS).
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Coolant Feed?
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Hole or channel for directed coolant feed at or near the cutting edges.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Split Point?
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Split point drill heads are used for chip clearance and for good centering, avoiding "walking" on the workpiece on initial contact.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Tables:
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Reference for letter and number drill size equivalents.
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| Number | Decimal | Number | Decimal | Number | Decimal | Letter | Decimal | | 80 | 0.0135 | 53 | 0.0595 | 26 | 0.1470 | A | 0.2340 | | 79 | 0.0145 | 52 | 0.0635 | 25 | 0.1495 | B | 0.2380 | | 78 | 0.0160 | 51 | 0.0670 | 24 | 0.1520 | C | 0.2420 | | 77 | 0.0180 | 50 | 0.0700 | 23 | 0.1540 | D | 0.2460 | | 76 | 0.0200 | 49 | 0.0730 | 22 | 0.1570 | E | 0.2500 | | 75 | 0.0210 | 48 | 0.0760 | 21 | 0.1590 | F | 0.2570 | | 74 | 0.0225 | 47 | 0.0785 | 20 | 0.1610 | G | 0.2610 | | 73 | 0.0240 | 46 | 0.0810 | 19 | 0.1660 | H | 0.2660 | | 72 | 0.0250 | 45 | 0.0820 | 18 | 0.1695 | I | 0.2720 | | 71 | 0.0260 | 44 | 0.0860 | 17 | 0.1730 | J | 0.2770 | | 70 | 0.0280 | 43 | 0.0890 | 16 | 0.1770 | K | 0.2810 | | 69 | 0.0292 | 42 | 0.0935 | 15 | 0.1800 | L | 0.2900 | | 68 | 0.0310 | 41 | 0.0960 | 14 | 0.1820 | M | 0.2950 | | 67 | 0.0320 | 40 | 0.0980 | 13 | 0.1850 | N | 0.3020 | | 66 | 0.0330 | 39 | 0.0995 | 12 | 0.1890 | O | 0.3160 | | 65 | 0.0350 | 38 | 0.1015 | 11 | 0.1910 | P | 0.3230 | | 64 | 0.0360 | 37 | 0.1040 | 10 | 0.1935 | Q | 0.3320 | | 63 | 0.0370 | 36 | 0.1065 | 9 | 0.1960 | R | 0.3390 | | 62 | 0.0380 | 35 | 0.1100 | 8 | 0.1990 | S | 0.3480 | | 61 | 0.0390 | 34 | 0.1110 | 7 | 0.2010 | T | 0.3580 | | 60 | 0.0400 | 33 | 0.1130 | 6 | 0.2040 | U | 0.3680 | | 59 | 0.0410 | 32 | 0.1160 | 5 | 0.2055 | V | 0.3770 | | 58 | 0.0420 | 31 | 0.1200 | 4 | 0.2090 | W | 0.3860 | | 57 | 0.0430 | 30 | 0.1285 | 3 | 0.2130 | X | 0.3970 | | 56 | 0.0465 | 29 | 0.1360 | 2 | 0.2210 | Y | 0.4040 | | 55 | 0.0520 | 28 | 0.1405 | 1 | 0.2280 | Z | 0.4130 | | 54 | 0.0550 | 27 | 0.1440 | | | | |
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