Conversion Charts
Wire Conversion Chart
| Gauge | inches | mm | drill bit |
| 10 | 0.1019 | 2.586 | 38 |
| 12 | 0.0808 | 2.050 | 46 |
| 14 | 0.0641 | 1.626 | 51 |
| 16 | 0.0508 | 1.289 | 54 |
| 18 | 0.0403 | 1.022 | 56 |
| 19 | 0.0359 | 0.910 | |
| 20 | 0.0320 | 0.811 | 65 |
| 22 | 0.0253 | 0.643 | 70 |
| 24 | 0.0201 | 0.510 | 74 |
| 26 | 0.0159 | 0.404 | |
| 28 | 0.0126 | 0.320 |
Ring Size Chart
| Number Sizes | Inside | Inside | Inside | Inside |
| US/Canada | Diameter | Diameter | Circumference | Circumference |
| Standard | (inches) | (mm) | (inches) | (mm) |
| 5 | 0.618 | 15.7 | 1.941 | 49.3 |
| 5 1/2 | 0.634 | 16.1 | 1.991 | 50.6 |
| 6 | 0.65 | 16.5 | 2.041 | 51.8 |
| 6 1/2 | 0.666 | 16.9 | 2.091 | 53.1 |
| 7 | 0.682 | 17.3 | 2.141 | 54.4 |
| 7 1/2 | 0.698 | 17.7 | 2.192 | 55.7 |
| 8 | 0.714 | 18.1 | 2.242 | 56.9 |
| 8 1/2 | 0.73 | 18.5 | 2.292 | 58.2 |
| 9 | 0.746 | 18.9 | 2.342 | 59.5 |
| 9 1/2 | 0.762 | 19.4 | 2.393 | 60.8 |
| 10 | 0.778 | 19.8 | 2.443 | 62.1 |
| 10 1/2 | 0.794 | 20.2 | 2.493 | 63.3 |
| 11 | 0.81 | 20.6 | 2.543 | 64.6 |
| 11 1/2 | 0.826 | 21 | 2.594 | 65.9 |
| 12 | 0.842 | 21.4 | 2.644 | 67.2 |
| 12 1/2 | 0.858 | 21.8 | 2.694 | 68.4 |
How to calculate the legnth of a ring shank:
Diameter (dm) of desired ring size in milimieters added (+) to material thickness (mt) multiplied (x) by pie (π), plus (+) 1mm for wiggle room.
dm + (mt*π) +1mm
Ring width 5-6mm add 1/4 size
Ring width 7-8mm add 1/4 size
Jump Ring Size Chart
| Gauge | OD MM | ID MM | Gauge | OD MM | ID MM | |
|
20g |
4 |
2.376 |
19g |
4 |
2.176 |
|
|
20g |
4.5 |
2.876 |
19g |
4.5 |
2.676 |
|
|
20g |
5 |
3.376 |
19g |
5 |
3.176 |
|
|
20g |
5.5 |
3.876 |
19g |
5.5 |
3.676 |
|
|
20g |
6 |
4.376 |
19g |
6 |
4.176 |
|
|
20g |
6.5 |
4.876 |
19g |
6.5 |
4.676 |
|
|
20g |
7 |
5.376 |
19g |
7 |
5.176 |
|
|
20g |
7.5 |
5.876 |
19g |
7.5 |
5.676 |
|
|
20g |
8 |
6.376 |
19g |
8 |
6.176 |
|
|
|
|
|
||||
|
18g |
4 |
1.952 |
||||
|
18g |
4.5 |
2.452 |
||||
|
18g |
5 |
2.952 |
17g |
5 |
2.702 |
|
|
18g |
5.5 |
3.452 |
17g |
5.5 |
3.202 |
|
|
18g |
6 |
3.952 |
17g |
6 |
3.702 |
|
|
18g |
6.5 |
4.452 |
17g |
6.5 |
4.202 |
|
|
18g |
7 |
4.952 |
17g |
7 |
4.702 |
|
|
18g |
7.5 |
5.452 |
17g |
7.5 |
5.202 |
|
|
18g |
8 |
5.952 |
17g |
8 |
5.702 |
Saw Blade Chart
| Blade Size | For use with: | Blade Thickness | Blade Depth | Teeth per Inch | Drill Size for Piercing |
| 6/o | 24 gauge | .0070'' | .0140'' | 76 | 79 |
| 5/o | 22-24 gauge | .0080'' | .0157'' | 71 | 78 |
| 4/o | 22 gauge | .0086'' | .0175'' | 66 | 77 |
| 3/o | 22 gauge | .0095'' | .0190'' | 61 | 76 |
| 2/o | 20-22 gauge | .0103'' | .0204'' | 56 | 75 |
| 1/o | 18-22 gauge | .0110'' | .0220'' | 53.5 | 73 |
| 1 | 18-20 gauge | .0120'' | .0240'' | 51 | 71 |
| 2 | 16-18 gauge | .0134'' | .0276'' | 43 | 70 |
| 3 | 12-14 gauge | .0140'' | .0290'' | 40.5 | 68 |
| 4 | 10 gauge | .0150'' | .0307'' | 38 | 67 |
| 5 | 8 gauge | .0158'' | .0331'' | 35.5 | 65 |
| 6 | 6-8 gauge | .0173'' | .0370'' | 33 | 58 |