Thread data
SAE 45° flare thread chart and dimensions
45° flare fitting that seals metal to metal on the flare seat, in -2 to -12 sizes with UNF threads. Common on refrigeration, air conditioning, gas appliance and brake lines. It shares threads with 37° JIC in some sizes but the seat angles do not mate.
- Standard
- SAE J512 45° flare
- Seals by
- 45° flare metal seat
- Used for
- Refrigeration, fuel gas, propane and automotive lines
- Sizes
- -2 to -12
SAE 45° flare dimensions
The dimensions we machine to. Pressure values are nominal working ratings for steel at room temperature.
| Size | Male | Female | Thread | Tube OD | Pitch dia | Minor dia, male | Minor dia, female | Male thread length | Tap drill | Seat | Rated to |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -2 | 5/16-24 UNF-2A | 5/16-24 UNF-2B | 5/16-24 UNF | 3.17 mm | 7.25 mm | 6.64 mm | 6.79 mm | 7.11 mm | 17/64 (6.88 mm) | 45° flare, std bore 1.98 mm | 2,000 psi |
| -3 | 3/8-24 UNF-2A | 3/8-24 UNF-2B | 3/8-24 UNF | 4.76 mm | 8.84 mm | 8.23 mm | 8.38 mm | 7.62 mm | 21/64 (8.47 mm) | 45° flare, std bore 2.77 mm | 2,000 psi |
| -4 | 7/16-20 UNF-2A | 7/16-20 UNF-2B | 7/16-20 UNF | 6.35 mm | 10.29 mm | 9.55 mm | 9.74 mm | 8.89 mm | 25/64 (9.84 mm) | 45° flare, std bore 4.37 mm | 2,000 psi |
| -5 | 1/2-20 UNF-2A | 1/2-20 UNF-2B | 1/2-20 UNF | 7.94 mm | 11.88 mm | 11.14 mm | 11.33 mm | 9.40 mm | 29/64 (11.43 mm) | 45° flare, std bore 5.94 mm | 1,750 psi |
| -6 | 5/8-18 UNF-2A | 5/8-18 UNF-2B | 5/8-18 UNF | 9.52 mm | 14.96 mm | 14.14 mm | 14.35 mm | 10.67 mm | 9/16 (14.46 mm) | 45° flare, std bore 7.54 mm | 1,500 psi |
| -8 | 3/4-16 UNF-2A | 3/4-16 UNF-2B | 3/4-16 UNF | 12.70 mm | 18.02 mm | 17.10 mm | 17.33 mm | 11.94 mm | 11/16 (17.46 mm) | 45° flare, std bore 9.93 mm | 1,250 psi |
| -10 | 7/8-14 UNF-2A | 7/8-14 UNF-2B | 7/8-14 UNF | 15.88 mm | 21.05 mm | 20.00 mm | 20.26 mm | 13.46 mm | 51/64 (20.41 mm) | 45° flare, std bore 12.29 mm | 1,000 psi |
| -12 | 1 1/16-14 UNS-2A | 1 1/16-14 UNS-2B | 1 1/16-14 UNS | 19.05 mm | 25.81 mm | 24.76 mm | 25.02 mm | 15.24 mm | 63/64 (25.17 mm) | 45° flare, std bore 15.47 mm | 800 psi |
Adapters with SAE 45° flare
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