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Product:

Size Units:

Cutting Diameter:

Drill Type:

Rotation:

NAS Specifications?

Coolant Feed?

Split Point?

Construction:

Material:

Coating / Finish:

Shank Type:

Cutting Application:

Help with Drill Bits specifications:

Drill Specifications
   Product       
   Your choices are...         
   Individual Drill       Product is a single component. 
   Drill Set       Product is a set, consisting of a variety of sizes. 
   Search Logic:      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.
   Size Units:       
   Your choices are...         
   English / Fractional       Drill is designed with base units of inches or fractions of an inch. 
   Metric       Drill is designed with metric base units such as millimeters or centimeters. 
   Wire Gauge       Drills frequently are made in standard wire gauge sizes, designated 1 to 80. 
   Letter Size       Drill sets in standard letter designation sizes from A to Z. 
   Other       Other unlisted size series or units. 
   Search Logic:      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.
   Cutting Diameter:       Full tool cutting diameter. 
   Search Logic:      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.
   Drill Type       
   Your choices are...         
   Standard / Twist Drill       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. 
   Jobber Length Drill       Common industrial drill configuration, with somewhat longer flutes and overall length than standard twist drills. 
   Taper Length Drill       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. 
   Extension / Extra Length       Extra cutting flute length for deeper hole capability. 
   Screw Machine Drill       Shorter flute and overall length than standard drills for increased rigidity. 
   Spotting Drill       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. 
   Center Drill       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. 
   Microdrill       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. 
   Gundrill       Specialized drill for producing deep holes; typically incorporates coolant channels for smooth cutting and good surface finish. 
   Core Bit       Drill designed to capture a core of the material being drilled; cutting edges are peripheral, and the core is captured inside the cutting circle. In machining operations, a core drill can also refer to a three or four-flute drill used as a hole-finishing cutter. 
   Spade Drill       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. 
   Step Drill       Drill with incrementally increasing diameter steps. 
   Silver & Deming Drill       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. 
   Forstner Drill Bit       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. 
   Taper Drill       Drill with tapered sides, which cuts a wider 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. 
   High Helix Drill       Drill whose flutes have a higher helical flute angle than standard drill series. 
   Masonry Drill Bit       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. 
   Surgical / Dental Drill       Specialized drill for surgical or dental applications. 
   Hole Saw       Drill with a circular cutting profile; exterior circle is cut out, and inner material is removed. Often has a centering drill for hole placement. 
   Wood Bit       Drill specifically designed for drilling wood. 
   Combination Drill / Countersink       Drill with an angled shoulder to provide a clearance hole and countersink in one cutting operation; used for flat head screw holes. 
   Combination Drill / Counterbore       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. 
   Combination Drill / Tap       Combination of a pilot drill and cutting tap on one drill bit.  Threaded hole is cut in one operation. 
   Drill Blank       Blank for grinding standard or specialized cutting edges and flute geometry. 
   Other       Other unlisted, specialized, or proprietary drill bit type. 
   Search Logic:      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.
   Rotation:       
   Your choices are...         
   Right Hand       Most common; designed to cut while turning clockwise. 
   Left Hand       Designed to cut while turning counterclockwise. 
   Search Logic:      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.
   NAS Specifications?       Manufactured in accordance with National Aerospace Standards (NAS). 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Coolant Feed?       Hole or channel for directed coolant feed at or near the cutting edges. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Split Point?       Split point drill heads are used for chip clearance, good centering, and avoiding "walking" on the workpiece on initial contact. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Tables:         
   Reference for letter and number drill size equivalents.     

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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Construction
   Construction       
   Your choices are...         
   Solid Construction       Drill is manufactured from a solid piece of material. 
   Holder and Inserts       Drill is constructed with a holder with attachable inserts; these inserts typically bolt onto the holder and are replaceable when the cutting edges are worn. 
   Search Logic:      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.
   Material       
   Your choices are...         
   High Speed Steel       Cost-efficient cutter material, used for general application metal machining. 
   Cobalt       Cobalt steel drills are somewhat harder than high speed steel and are often used for drilling in stainless steel and other alloys. 
   Carbide       Carbide grades are much harder than high speed steel, and therefore last longer and wear less. Several coatings are available to lengthen cutter life. 
   Diamond / PCD       Industrial diamond grades such as polycrystalline diamond (PCD) are used for very long life, and sometimes for special applications such as very high speed cutting. 
   Other       Other unlisted or specialized cutter material. 
   Search Logic:      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.
   Coating / Finish:       
   Your choices are...         
   None       Uncoated cutting edges. 
   Coated       Drill has a coating to assist in cutting lubricity and/or add abrasion resistance for longer tool life. 
   Search Logic:      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.
   Shank Type       
   Your choices are...         
   Straight Shank       Drill shank is the same diameter as the cutting edges; includes holders with straight shanks. 
   Tapered Shank       Shank is tapered for mounting in a standard drilling machine holder. 
   Reduced Shank       Shank mounting diameter is reduced from cutting diameter, often for mounting in a smaller or standard-size chuck. 
   Hex Shank       Mounting portion of shank is hexagonal in shape for positive-hold mounting in a chuck. 
   Square Shank       Square shank for handle, wrench, or vise engagement. 
   Threaded Shank       Shank is threaded for screwing into the mounting arbor. 
   Other       Other unlisted, specialized, or proprietary shank style. 
   Search Logic:      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 Application
   Cutting Application       
   Your choices are...         
   General Purpose       Designed for a variety of materials and general applications. 
   Aluminum       Widely used machining material, combining generally good machinability, good strength-to-weight ratio, non-magnetic properties, and corrosion resistance. Available in many grades for different applications. 
   Bronze / Brass / Copper       Many different grades of copper and its alloys are used in electrical, plumbing, fluid power, decorative, and other applications. Machinability and properties vary widely with the various alloys. 
   Ceramic       Broad class of bonded materials noted for good thermal properties, and wear and abrasion resistance. 
   Hard / Hardened Metals       This category includes hard and ultrahard materials such as carbide grades and hardened steels. 
   Plastic       Drills designed for machining of plastics and polymers can include specialized rake and relief angles, chip clearance geometry, and coatings for this purpose. 
   Steel       Broad category of alloys containing primarily iron with trace amounts of carbon and other alloying elements. This category includes all steels, such as mild steel, tool steel, etc. 
   Stainless Steel       Steel alloyed for corrosion resistance and generally non-magnetic qualities; available in many grades. 
   Titanium / Exotic Metals       Drills designed for use with metals such as titanium, niobium alloys, precious metals, etc. 
   Wood       Drills and bits designed for cutting wood. 
   Other       Other unlisted material application. 
   Search Logic:      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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