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
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
UNC
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
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
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)