Ref :- http://www.elginfasteners.com/metric.htm
Diameter/Decimal/Metric Chart for Small Diameter Fasteners
| |||
Gauge
or Diameter |
Decimal (in)
|
mm
|  |
No. 0000
|
0.021
|
.53
| |
No. 000
|
0.034
|
.86
| |
No. 00
|
0.047
|
1.19
| |
No. 0
|
0.060
|
1.524
| |
No. 1
|
0.073
|
1.854
| |
No. 2
|
0.086
|
2.184
| |
No. 3
|
0.099
|
2.515
| |
No. 4
|
0.112
|
2.845
| |
No. 5
|
0.125
|
3.175
| |
No. 6
|
0.138
|
3.505
| |
No. 8
|
0.164
|
4.166
| |
No. 10
|
0.190
|
4.826
| |
No. 12
|
0.216
|
5.484
| |
Fastener Conversion Chart
| |||
Inch Equivalent
|
Metric Size-Pitch
ISO and IFI Rec. | ||
UNC
|
UNF
| ||
1 - 64
|
1 - 72
|
M2 x 0.4
| |
3 - 48
|
3 - 56
|
M2.5 x 0.45
| |
4 - 40
|
4 - 48
|
M3 x .05
| |
6 - 32
|
6 - 40
|
M3.5 x .06
| |
8 - 32
|
8 - 36
|
M4 x .07
| |
10 - 24
|
10 - 32
|
M5 x .08
| |
1/4 - 20
|
1/4 - 28
|
M6 x 1
| |
5/16 -18
|
5/16 - 24
|
M8 x 1.25
| |
3/8 -16
|
3/8 - 24
|
M10 x 1.5
| |
7/16 -14
|
7/16 - 20
|
M12 x 1.75
| |
1/2 - 13
|
1/2 - 20
|
M14 x 2
| |
5/8 - 11
|
5/8 - 18
|
M18 x 2
| |
3/4 - 10
|
3/4 - 16
|
M20 x 2.5
| |
1 - 8
|
1-12
|
M24 x 3
| |
1-1/4 - 7
|
1-1/8 - 12
|
M30 x 3.5
| |
1-1/2 - 6
|
1-1/4 - 12
|
M36 x 4
| |
Approximate Equivalency Chart Metric/US
Roughly Equivalent US Bolt Materials | |||
Metric
Nut Class |
SAE J429
Normally Used |
Grades
|
ASTM Grades
|
4.6
|
4 or 5
|
1
|
A307, Grade A
|
4.8
|
4 or 5
|
2
|
.
|
5.8
|
5
|
2
|
.
|
8.8
|
8
|
5
|
A325, A449
|
9.8
|
9
|
5+
|
A193, B7 and B16
|
10.9
|
10 or 12
|
8
|
A490, A354, Grade 8D
|
12.9
|
10 or 12
|
.
|
A540; B21 through B24
|
Common DIN Numbers for Metric Fasteners
| |||
| DIN | Hex Capscrews | ||
| 931 | Coarse thread pitch partially threaded (specify grade) | ||
| 933 | Coarse thread pitch fully threaded (specify grade) | ||
| 930 | Fine thread pitch partially threaded (specify grade) | ||
| 961 | Fine thread pitch fully threaded (specify grade) | ||
| DIN | Nuts | ||
| 934 | Hex nuts (specify pitch and class) | ||
| 985 | Nylon insert locknuts (specify pitch and class) | ||
| 980V | All metal locknuts (specify pitch and class) | ||
| DIN | Washers | ||
| 125 | Flatwashers | ||
| 127 | Lockwashers | ||
| DIN | Socket Products | ||
| 912 | Socket head capscrews (normally GR 12.9 and coarse thread) | ||
| 7991 | Flat head socket capscrews (normally GR 12.9 and coarse thread) | ||
| 916 | Socket setscrews (normally GR 12.9 and coarse thread) | ||
| DIN | Machine Screws | ||
| 7985 | Pan head Phillips drive zinc plated | ||
| 965 | Flat head Phillips drive zinc plated | ||
| DIN | Threaded Rod | ||
| 975 | All threaded rod (normally 1 meter lengths, specify grade and pitch) | ||
