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Metric Fastener Conversions

Metric fastener conversions data for industrial bolts/rods, industrial machine screws, threaded rods and small diameter fasteners is available from Leland Powell Fasteners, Inc.

Diameter/Decimal/Metric Chart for Small Diameters
Gauge
or Diameter
Decimal (in)
mm
Metric fastener conversions data from Leland Powell.
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)

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Leland Powell Leland Powell Fasteners, Inc.
8160 Highway 45 South
Martin, Tennessee 38237 USA
tel: 731-587-3106 • fax: 731-587-9613
email: info@lelandpowell.com
www.lelandpowell.com
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