HSS Asme Screw Machine Drill Bit

Short Description:

The short flute and overall length of Screw Machine Drill Bit both provide drilling capabilities within the limited space of an auger and increase the rigidity of portable drills. The drill’s overall length and short flutes increase rigidity. The short shank is not as stiff as the drill body, allowing for more flexibility and less breakage. Designed for use with screw machines and portable applications where short rigid drill bits are recommended, especially suitable for CNC drilling applications. Stub helix twist drills have a shorter overall length than process length drills for maximum rigidity and longer tool life. Also known as short drill bits, they are primarily designed for use in screw machine machining operations, but can also be used with manual hand drills.

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Screw Machine Drill Bits feature a bright, smooth surface for improved chip evacuation and a medium helical structure for stable drilling conditions. Coated solid carbide designs drill three to five times deeper than HSS drills, often eliminating the need for reaming and spot drilling. For best performance and best tool life, it is recommended to use a suitable lubricant/cutting oil or a suitable coolant. Screw Machine Drill Bits have shorter flutes and a shorter overall length, making them stiffer than machining drill bits, reducing deflection and breakage.

The machine drill bit length is 5/8 of the normal processing length of a drill bit. These shorter drill bits are suitable for small lathes and small milling machines where the tool distance is short. Other applications include portable drilling of tough, hard materials. For portable or mechanical drilling in hard steel, stainless steel and other hard materials. HSS models are best suited to drilling steel, cast steel, cast iron or other alloyed or non-alloyed ferrous materials, but they are also suitable for a variety of non-ferrous and non-metallic materials.

D D L2 L1

3/64

.0469

1/2

1-3/8

#10

.1935

1-3/16

2-1/4

#49

.0730

11/16

1-11/16

1/16

.0625

5/8

1-5/8

#11

.1910

1-3/16

2-1/4

#50

.0700

11/16

1-11/16

5/64

.0781

11/16

1-11/16

#12

.1890

1-3/16

2-1/4

#51

.067C

11/16

1-11/16

3/32

.0938

3/4

1-3/4

#13

.1850

1-1/8

2-3/16

#52

.0635

11/16

1-11/16

7/64

.1094

13/16

1-13/16

#14

.1820

1-1/8

2-3/16

#53

.0595

5/8

1-5/8

1/8

.1250

7/8

1-7/8

#15

.1800

1-1/8

2-3/16

#54

.0550

5/8

1-5/8

9164

.1406

15/16

1-15/16

#16

.1770

1-1/8

2-3/16

#55

.0520

5/8

1-5/8

5/32

.1562

2-1/16

#17

.1730

1-1/8

2-3/16

#56

.0465

1/2

1-3/8

11/64

.1719

1-1/16

2-1/8

#18

.1695

1-1/16

2-1/8

#57

.0430

1/2

1-3/8

3/16

.1875

1-1/8

2-3/16

#19

.1660

1-1/16

2-1/8

#58

.0420

1/2

1-3/8

13/64

.2031

1-3/16

3-1/4

#20

.1610

1-1/16

2-1/8

#59

.0410

1/2

1-3/8

7/32

.2188

1-1/4

2-3/8

#21

.1590

1-1/16

2-1/8

#60

.0400

1/2

1-3/8

15/64

.2344

1-5/16

2-7/16

#22

.1570

1-1/16

2-1/8

.2340

1-15/16

2-7/16

1/4

.2500

1-3/8

2-1/2

#23

.1540

2-1/16

.2380

1-3/8

2-1/2

17/64

.2656

1-7/16

2-5/8

#24

.1520

2-1/16

.2420

1-3/8

2-1/2

9/32

.2812

1-1/2

2-11/16

#25

.1495

2-1/16

.2460

1-3/8

2-1/2

19/64

.2969

1-9/16

2-3/4

#26

.1470

2-1/16

.2500

1-3/8

2-1/2

5/16

.3125

1-5/8

2-13/16

#27

.1440

2-1/16

.2570

1-7/16

2-5/8

21/64

.3281

1-11/16

2-15/16

#28

.1405

15/16

1-15/16

.2610

1-7/16

2-5/8

11/32

.3438

1-11/16

#29

.1360

15/16

1-15/16

.2660

1-1/2

2-11/16

23/64

.3594

1-3/4

3-1/16

#30

.1285

15/16

1-15/16

.2720

1-1/2

2-11/16

3/8

.3750

1-13/16

3-1/8

#31

.1200

7/8

1-7/8

.2770

1-1/2

2-11/16

25/64

.3906

1-7/8

3-1/4

#32

.1160

7/8

1-7/8

.2810

1-1/2

2-11/16

13/32

.4062

1-15/16

3-5/16

#33

.1130

7/8

1-7/8

.2900

1-9/16

2-3/4

27/64

.4219

3-3/8

#34

.1110

7/8

1-7/8

.2950

1-9/16

2-3/4

7/16

.4375

2-1/16

3-7/16

#35

.1100

7/8

1-7/8

.3020

1-5/8

2-13/16

29/64

.4531

2-1/8

3-9/16

#36

.1065

13/16

1-13/16

.3160

1-11/16

2-15/16

15/32

.4688

2-1/8

3-5/8

#37

.1040

13/16

1-13/16

.3230

1-11/16

2-15/16

31/64

.4844

2-3/16

3-11/16

#38

.1015

13/16

1-13/16

.3320

1-11/16

1/2

.5000

2-1/4

3-3/4

#39

.0995

13/16

1-13/16

.3390

1-11/16

.2280

1-5/16

2-7/16

#40

.0980

13/16

1-13/16

.3480

1-3/4

3-1/16

.2210

1-5/16

2-7/16

#41

.0960

13/16

1-13/16

.3580

1-3/4

3-1/16

.2130

1-1/4

2-3/8

#42

.0935

3/4

1-3/4

.3680

1-13/16

3-3/8

.2090

1-1/4

2-3/8

#43

.0890

3/4

1-3/4

.3770

1-7/8

3-1/4

.2055

1-1/4

2-3/8

#44

.8660

3/4

1-3/4

.3860

1-7/8

3-1/4

.2040

1-1/4

2-3/8

#45

.0820

3/4

1-3/4

.3970

1-15/16

3-15/16

.2010

1-3/16

2-1/4

#46

.0810

3/4

1-3/4

.4040

1-15/16

3-15/16

.1990

1-3/16

2-1/4

#47

.0785

11/16

1-11/16

.4130

3-3/8

.1960

1-3/16

2-1/4

#48

.0760

11/16

1-11/16

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