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"Internet
Content Rating Association," "ICRA" and the ICRA logo are
registered as trademarks in the UK and USA.
SafeSurf Wave™, SafeSurfing™, Kid's Wave™, Internet Lifeguard™ & S.E.R.F.™ are
trademarks of SafeSurf®
Thread
Pitch
(For Bolts and Screws that take Nuts)
(US Standard)
| Size | Major Dia | Threads Per Inch | Threads Per Inch | Threads Per Inch |
| # | inch | UNC/USS | UNF/SAE | UN8/UNS |
| #0000 | n/a | 120 | 160 | N/A |
| #000 | n/a | 96 | 120 | N/A |
| #00 | n/a | 80 | 96 | N/A |
| #0 | 0.060 | 72 | 80 | N/A |
| #1 | 0.073 | 64 | 72 | N/A |
| #2 | 0.086 | 56 | 64 | N/A |
| #3 | 0.099 | 48 | 56 | N/A |
| #4 | 0.112 | 40 | 48 | N/A |
| #5 | 0.125 | 40 | 44 | N/A |
| #6 | 0.138 | 32 | 40 | N/A |
| #8 | 0.164 | 32 | 36 | N/A |
| #10 | 0.19 | 24 | 32 | N/A |
| #12 | 0.216 | 24 | 28 | N/A |
| 1/4 | 0.25 | 20 | 28 | N/A |
| 5/16 | 0.3125 | 18 | 24 | N/A |
| 3/8 | 0.375 | 16 | 24 | N/A |
| 7/16 | 0.4375 | 14 | 20 | N/A |
| 1/2 | 0.5 | 13 | 20 | N/A |
| 9/16 | 0.5625 | 12 | 18 | N/A |
| 5/8 | 0.625 | 11 | 18 | N/A |
| 3/4 | 0.75 | 10 | 16 | N/A |
| 7/8 | 0.875 | 9 | 14 | N/A |
| 1 | 1 | 8 | 14 (12) | 8 |
| 11/8 | 1.125 | 7 | 12 | 8 |
| 11/4 | 1.25 | 7 | 12 | 8 |
| 13/8 | 1.375 | 6 | 12 | 8 |
| 11/2 | 1.5 | 6 | 12 | 8 |
| 15/8 | 1.625 | 5.5 | 12 | 8 |
| 13/4 | 1.75 | 5 | 12 | 8 |
| 17/8 | 1.875 | 5 | 12 | 8 |
| 2 | 2 | 4.5 | 12 | 8 |
| 21/4 | 2.25 | 4.5 | 12 | 8 |
| 21/2 | 2.5 | 4 | 12 | 8 |
| 23/4 | 2.75 | 4 | 12 | 8 |
| 3 | 3 | 4 | 12 | 8 |
| 31/4 | 3.25 | 4 | 12 | 8 |
| 31/2 | 3.5 | 4 | 12 | 8 |
| 33/4 | 3.75 | 4 | 12 | 8 |
| 4 | 4 | 4 | 12 | 8 |
Thread Pitch
(for Tapping Screws)
| Size | Major Dia | Threads Per Inch | Threads Per Inch |
| # | inch | "A"* | "B" and "AB" | and
| #0 | 0.060 | 40 | 48 |
| #1 | 0.073 | 32 | 42 |
| #2 | 0.086 | 32 | 32 |
| #3 | 0.099 | 28 | 28 |
| #4 | 0.112 | 24 | 24 |
| #5 | 0.125 | 20 | 20 |
| #6 | 0.138 | 18 | 20 |
| #7 | 0.164 | 16 | 19 |
| #8 | 0.164 | 15 | 18 |
| #10 | 0.19 | 12 | 16 |
| #12 | 0.216 | 11 | 14 |
| 1/4 (#14) | 0.25 | 10 | 14 |
| 5/16 (#20) | 0.3125 | 9 | 12 |
| 3/8 (#24) | 0.375 | 9 | 12 |
* Many diameters Wood Screws also have the same TPI as Tapping Screws.
