Diameter/Decimal/Metric Chart for Small Diameters | ||
| Guage 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 |
| 1-1/14 – 7 | 1-1/8 – 12 | M30 x 3.5 |
| 1-1/2 – 6 | 1-1/4 – 12 | M36 x 4 |
| Approximate Equivalency Chart Roughly Equivalent Imperial 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 | Flathead Phillips drive zinc-plated | ||
| DIN | Threaded Rod | ||
| 975 | All threaded rods (normally 1-meter lengths, specify grade and pitch) | ||