Rio Grande
Sharing your passion for making jewelry.
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High-Speed Steel Twist Drill, #74, 0.57mm

Qty*
Price
1 - 2
$6.45
3 - 5
$5.95
6 and above
$5.45
 *Priced per pack of 10

High-Speed Steel Twist Drill, #74, 0.57mm

Item Number: 349433

These high-speed steel drills are accurately ground and tempered. Shank size is the same as the drill size.

Brand: Rio Grande
Material: High-speed steel
Head size: 0.57mm (.0225")
Shank size: 0.57mm (.0225")
Article no.: 74
Country of origin: China
Catalog page: 2014 Tools and Equipment Catalog p.333

How To
Choose the Right Bur-Life
Often copied but never equaled in either performance or benefits, Bur-Life® is the best available lubricant for jewelry applications. Like a coating of microscopic ball bearings, Bur-Life provides a smoother cut with far less friction and more control.
Other lubricants are repelled by heat and draw away from the cutting edge. Bur-Life is attracted by heat, so the friction and resulting heat produced by saw blades, burs, files and other cutting tools actually draws Bur-Life to the point of contact, resulting in a better finish.
With Bur-Life, your tools work faster, stay sharper and last longer.
Choose from three formulas:
• Original: Stick or bench-mount cartridges
• Paste: Specially formulated for tasks where surfaces require a complete coating
• Liquid: Penetrates to lubricate; for complex or porous surfaces that may be hard to coat.

• For burs: Increases precision in drilling and grinding and reduces chatter
Best formula: stick
• For files: Keeps files cutting clean and increases their cutting life by reducing wear on file surfaces.
Best formula: stick
• For gravers: Wipe your gravers with Bur-Life every few cuts.
Best formula: liquid
• For drawing wire: Apply to both wire and drawplate to make drawing wire nearly effortless.
Best formula: liquid
• For saw blades: Reduces drag and binding during cutting. Blades cut smoother, resist breaking and last up to twice as long.
Best formula: stick
• For wheel dressing: This ideal wheel dressing provides superior lubrication even under tremendous friction. Abrasive wheels cut smoother and faster.
Best formula: stick
• For stamping and tap & die operations: Coats surfaces completely for efficient stamping
Best formula: any
• For grinding wheels and abrasive belts: Keeps wheels running cool
Best formula: stick
• For diamond drills: An excellent cooling bath! Dip diamond burs periodically to keep them cool while you work.
Best formula: liquid



Charts

Brown & Sharpe Gauge Thicknesses

Use this handy guide to quickly, easily and accurately convert gauge sizes into inches or millimeters—or vice versa.

Gauge

Inches

Millimeters

0

.325

8.26

2

.257

6.54

4

.204

5.19

6

.162

4.12

8

.128

3.26

10

.102

2.59

12

.081

2.05

13

.072

1.83

14

.064

1.63

15

.057

1.45

16

.051

1.29

18

.040

1.02

19

.036

.912

20

.032

.812

21

.028

.723

22

.025

.644

23

.023

.573

24

.020

.511

25

.018

.455

26

.016

.405

27

.014

.360

28

.013

.321

29

.011

.286

30

.010

.255

32

.0080

.2019

34

.0063

.1600




Saw Blade and Drill Size Specification
Blade
size
Blade
thickness
Blade
depth
Teeth per inch Recommended
for: (B&S gauge)
Drill size for piercing
8/0 .0063" .0126" 89.0 up to 26 80
7/0 .0067" .0130" 84.0 24–26 80
6/0 .0070" .0140" 76.0 24 79
5/0 .0080" .0157" 71.0 22–24 78
4/0 .0086" .0175" 66.0 22 77
3/0 .0095" .0190" 61.0 22 76
2/0 .0103" .0204" 56.0 20–22 75
1/0 .0110" .0220" 53.5 18–22 73
1 .0120" .0240" 51.0 18–20 71
2 .0134" .0276" 43.0 16–18 70
3 .0140" .0290" 40.5 16–18 68
4 .0150" .0307" 38.0 16–18 67
5 .0158" .0331" 35.5 16 65
6 .0173" .0370" 33.0 14 58
7 .0189" .0400" 30.5 12 57
8 .0197" .0440" 28.0 12 55



Drill Bit to Wire Gauge Conversion Chart
B&S mm inches drill size
0 8.26 .325 21/64  
1 7.34 .289 9/32  
2 6.52 .257 1/4  
3 5.81 .229 7/32 1
4 5.18 .204 13/64 6
5 4.62 .182 3/16 15
6 4.11 .162 5/32 20
7 3.66 .144 9/64 27
8 3.25 .128 1/8 30
9 2.90 .114    
10 2.59 .102   38
11 2.31 .091 5/32 43
12 2.06 .081 5/64 46
13 1.83 .072   50
14 1.63 .064 1/16 51
15 1.45 .057   52
16 1.30 .051   54
17 1.14 .045 3/64 55
18 1.02 .040   56
19 0.914 .036   60
20 0.812 .032 1/32 65
21 0.711 .028   67
22 0.635 .025   70
23 0.558 .022   71
24 0.508 .020   74
25 0.457 .018   75
26 0.406 .016 1/64 77
27 0.355 .014   78
28 0.304 .012   79
29 0.279 .011   80
30 0.254 .010