Rio Grande
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High-Speed Steel Twist Drill, #67, 0.81mm
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High-Speed Steel Twist Drill, #67, 0.81mm

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

High-Speed Steel Twist Drill, #67, 0.81mm

Item Number: 349426

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: 0.81mm (.0320")
Shank size: 0.81mm (.0320")
Article no.: 67
Country of origin: CHINA
Catalog page: 2013 Tools and Equipment Catalog p.314
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

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

 



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


Equivalent Numbers

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