O-Ring Pilot Threads
This connection is widely found in automotive and commercial air conditioning applications. Both male and female halves have a pilot (could be long or short), and the seal is made when the O-ring is compressed. Threads tightly mesh together to form a strong mechanical bond.
Inch size | Dash size | Male Thread | Female thread | ||
Thread size | Thread O.D. | Thread size | Thread I.D. | ||
3⁄8 | -6 | 5⁄8 - 18 | 5⁄8 | 5⁄8 - 18 | 9⁄16 |
1⁄2 | -8 | 3⁄4 - 18 | 3⁄4 | 3⁄4 - 16 | 11⁄16 |
5⁄8 | -10 | 7⁄8 - 18 | 7⁄8 | 7⁄8 - 14 | 13⁄16 |
3⁄4 | -12 | 1 1⁄16 - 16 | 1 1⁄16 | 1 1⁄16 - 14 | 1 |
Inch size | Dash size | Long pilot | Short pilot | ||
Bead O.D. (in) | Pilot Length (in) | Bead O.D. (in) | Pilot Length (in) | ||
3⁄8 | -6 | 0.52 | 0.28 | 0.52 | 0.19 |
1⁄2 | -8 | 0.64 | 0.39 | 0.64 | 0.19 |
5⁄8 | -10 | 0.77 | 0.39 | 0.77 | 0.19 |
3⁄4 | -12 | 0.91 | 0.39 | 0.91 | 0.19 |
