Thread data
Micro thread thread chart and dimensions
Small instrument threads such as 10-32 UNF, M5 and 1/4-28, sealed with an O ring or bonded washer. Used for sensors, pneumatic valves, fluidics and test ports.
- Standard
- ISO 261, ASME B1.1
- Seals by
- O ring or bonded washer
- Used for
- Instruments, sensors, pneumatics, fuel test ports
- Sizes
- M3 to 1/4-28
Micro thread dimensions
The dimensions we machine to. Pressure values are nominal working ratings for steel at room temperature.
| Size | Male | Female | Thread | Pitch | Major dia | Pitch dia | Minor dia, male | Minor dia, female | Thread length | Tap drill | Seal | Threads per inch | Rated to |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | M3×0.5-6g | M3×0.5-6H | M3×0.5 | 0.50 mm | 3.00 mm | 2.68 mm | 2.39 mm | 2.46 mm | 4.00 mm | 2.50 mm | O ring or bonded washer | – | 1,500 psi |
| #6-40 | 6-40 UNF-2A | 6-40 UNF-2B | 6-40 UNF | – | 3.51 mm | 3.09 mm | 2.73 mm | 2.82 mm | 3.81 mm | #33 (2.87 mm) | O ring or bonded washer | 40 | 1,500 psi |
| M4 | M4×0.7-6g | M4×0.7-6H | M4×0.7 | 0.70 mm | 4.00 mm | 3.55 mm | 3.14 mm | 3.24 mm | 5.00 mm | 3.30 mm | O ring or bonded washer | – | 1,500 psi |
| #10-32 | 10-32 UNF-2A | 10-32 UNF-2B | 10-32 UNF | – | 4.83 mm | 4.31 mm | 3.85 mm | 3.97 mm | 4.83 mm | #21 (4.03 mm) | O ring or bonded washer | 32 | 1,500 psi |
| M5 | M5×0.8-6g | M5×0.8-6H | M5×0.8 | 0.80 mm | 5.00 mm | 4.48 mm | 4.02 mm | 4.13 mm | 5.00 mm | 4.20 mm | O ring or bonded washer | – | 1,500 psi |
| M6 | M6×1-6g | M6×1-6H | M6×1 | 1.00 mm | 6.00 mm | 5.35 mm | 4.77 mm | 4.92 mm | 6.00 mm | 5.00 mm | O ring or bonded washer | – | 1,500 psi |
| 1/4-28 | 1/4-28 UNF-2A | 1/4-28 UNF-2B | 1/4-28 UNF | – | 6.35 mm | 5.76 mm | 5.24 mm | 5.37 mm | 6.35 mm | #3 (5.44 mm) | O ring or bonded washer | 28 | 1,500 psi |
Adapters with Micro thread
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