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Jump Ring Mandrels

In general, most jewelry chain maille patterns that I've come across use inner diameters in millimeters, while armor patterns use fraction of inches.

Personally, I like the mandrels I bought with my Koil Kutter.  They range from 1.5 mm to 13 mm in increments of half millimeters.  There is a slot in the end of the mandrel to hold the wire you are winding.

Koil Kutter Mandrels

MM Actual MM Inch
1.0 1.0 .0395
1.5 1.45 .0570
2.0 1.99 .0785
2.5 2.43 .0960
3.0 2.91 .1150
3.5 3.40 .1340
4.0 3.95 .1555
4.5 4.46 .1755
5.0 4.96 .1955
5.5 5.45 .2150
6.0 5.98 .2355
6.5 6.46 .2545
7.0 6.96 .2740
7.5 7.51 .2960
8.0 7.95 .3155
8.5 8.46 .3335
9.0 8.96 .3530
9.5 9.47 .3730
10.0 9.96 .3920
10.5 10.46 .4120
11.0 10.95 .4310
11.5 11.45 .4510
12.0 11.95 .4705
12.5 12.43 .4895
13.0 12.92 .5095

Jean Hickok's Coil Winder Mandrels

Inch Fraction Actual MM
.062 1/16 1.58
.093 3/32 2.38
.123 1/8 3.13
.187 3/16 4.75
.251 1/4 6.37

Jump Ringer® Mandrels

Inch Nom MM Fraction Actual MM
.063 1.5 1/16 1.60
.078 2.0 5/64 1.98
.094 2.5 3/32 2.39
.125 3.0 1/8 3.18
.141 3.5 9/64 3.58
.156 4.0 5/32 3.96
.172 4.5 11/64 4.37
.188 5.0 3/16 4.78
.219 5.5 7/32 5.56
.234 6.0 15/64 5.94
.281 7.0 9/32 7.14
.313 8.0 5/16 7.95
.359 9.0 23/64 9.12
.391 10.0 25/64 9.93
.438 11.0 7/16 11.13
.469 12.0 15/32 11.91
 

Jump Ringer® Finger and Toe Ring Mandrels

US Ring Size Inch Actual MM
2 .520 13.12
3 .553 13.93
4 .585 14.73
5 .618 15.58
6 .650 16.36
7 .683 17.23
8 .716 18.02
9 .748 18.87
10 .781 19.75
11 .814 20.58
12 .846 21.45

Harbor Freight carries two transfer punch sets which could act as mandrels for wire winding (they do not carry a millimeter set).

Item # 3577 includes 28 pieces that range in size from 3/32" to 1/2" in increments of 1/64"

Item # 30319 includes 33 pieces that range in size from 1/2" to 1"

Item # 30320 includes 60 pieces that range in size from
#1 to #60 (same size as drill bits)

Harbor Freight Tools Transfer Punch Sets
(#3577 & 30319)

Inch Fraction Actual MM
.0915 3/32 2.32
.1090 7/64 2.77
.1260 1/8 3.19
.1390 9/84 3.52
.1570 5/32 3.98
.1705 11/64 4.33
.1845 3/16 4.68
.2010 13/64 5.11
.2170 7/32 5.51
.2340 15/64 5.94
.2480 1/4 6.30
.2640 17/64 6.70
.2800 9/32 7.11
.2950 19/64 7.49
.3110 5/16 7.90
.3255 21/64 8.25
.3415 11/32 8.66
.3575 23/64 9.08
.3730 3/8 9.48
.3900 25/64 9.90
.4040 13/32 10.26
.4215 27/64 10.70
.4370 7/16 11.10
.4520 29/64 11.48
.4675 15/32 11.88
.4840 31/64 12.29
.5000 1/2 12.70
.5145 33/64 13.06
.5300 17/32 13.45
.5470 35/64 13.89
.5620 9/16 14.27
.5770 37/64 14.65
.5925 19/32 15.05
.6075 39/64 15.43
.6240 5/8 15.85
.6415 41/64 16.29
.6560 21/32 16.66
.6720 43/64 17.06
.6870 11/16 17.44
.7020 45/64 17.83
.7180 23/32 18.24
.7345 47/64 18.65
.7490 3/4 19.02
.7650 49/64 19.42
.7785 25/32 19.77
.7955 51/64 20.21
.8120 13/16 20.62
.8265 53/64 20.99
.8425 27/32 21.40
.8595 55/64 21.82
.8730 7/8 22.18
.8895 57/64 22.59
.9055 29/32 23.00
.9235 59/64 23.46
.9360 15/16 23.77
.9530 61/64 24.20
.9695 31/32 24.63
.9825 63/64 24.96
1.000 1 25.40

Harbor Freight Tools Transfer Punch Sets
(#30320)

# Inch Actual MM
1 .2255 5.72
2 .2190 5.56
3 .2120 5.38
4 .2065 5.24
5 .2040 5.18
6 .2010 5.11
7 .1990 5.05
8 .1970 5.00
9 .1955 4.96
10 .1925 4.90
11 .1905 4.84
12 .1870 4.75
13 .1835 4.66
14 .1815 4.60
15 .1800 4.57
16 .1760 4.46
17 .1720 4.37
18 .1675 4.26
19 .1640 4.16
20 .1590 4.04
21 .1570 3.98
22 .1560 3.96
23 .1520 3.86
24 .1515 3.84
25 .1475 3.75
26 .1450 3.68
27 .1425 3.62
28 .1390 3.53
29 .1340 3.40
30 .1265 3.21
31 .1190 3.02
32 .1150 2.92
33 .1120 2.84
34 .1100 2.79
35 .1080 2.74
36 .1055 2.68
37 .1020 2.59
38 .1005 2.55
39 .0985 2.50
40 .0965 2.44
41 .0940 2.39
42 .0910 2.31
43 .0870 2.21
44 .0845 2.14
45 .0800 2.03
46 .0795 2.02
47 .0760 1.93
48 .0745 1.89
49 .0710 1.80
50 .0695 1.75
51 .0660 1.67
52 .0625 1.59
53 .0570 1.44
54 .0530 1.34
55 .0490 1.25
56 .0455 1.16
57 .0415 1.06
58 .0405 1.03
59 .0400 1.01
60 .0395 1.00

 

 

     


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