Diameter/Decimal/Metric
Chart for Small Diameters |
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 |
A306,
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 |
Flat
Washers |
| 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) |
