Thread data
AN thread chart and dimensions
The military and aerospace 37° flare that motorsport fuel, oil and coolant plumbing is built on. AN fittings share the 37° seat and UNF thread sizes with JIC, so a -6 AN mates with a -6 JIC, but the threads are held to the tighter class 3A and 3B. Usually 6061 aluminum, anodized red, blue or black.
- Standard
- AS4395, MS33656 37° flare (AN)
- Seals by
- 37° flare metal seat, class 3A/3B thread
- Used for
- Motorsport fuel, oil, coolant and brake lines, aircraft
- Sizes
- -2 to -32
Related thread charts: JIC 37° (AN), AN 37° swivel (B-nut), SAE ORB, SAE inverted flare (INV)
AN dimensions
The dimensions we machine to. Pressure values are nominal working ratings for steel at room temperature.
| Size | Male | Female | Thread | Thread class | Tube OD | Pitch dia | Minor dia, male | Minor dia, female | Male thread length | Tap drill | Seat | Rated to |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -2 | 5/16-24 UNF-3A AN 37° flare | 5/16-24 UNF-3B AN 37° flare | 5/16-24 UNF | 3A male, 3B female (AN) | 3.17 mm | 7.25 mm | 6.64 mm | 6.79 mm | 7.11 mm | 17/64 (6.88 mm) | 37° flare, std bore 1.98 mm | 5,000 psi |
| -3 | 3/8-24 UNF-3A AN 37° flare | 3/8-24 UNF-3B AN 37° flare | 3/8-24 UNF | 3A male, 3B female (AN) | 4.76 mm | 8.84 mm | 8.23 mm | 8.38 mm | 7.62 mm | 21/64 (8.47 mm) | 37° flare, std bore 2.77 mm | 5,000 psi |
| -4 | 7/16-20 UNF-3A AN 37° flare | 7/16-20 UNF-3B AN 37° flare | 7/16-20 UNF | 3A male, 3B female (AN) | 6.35 mm | 10.29 mm | 9.55 mm | 9.74 mm | 8.89 mm | 25/64 (9.84 mm) | 37° flare, std bore 4.37 mm | 5,000 psi |
| -5 | 1/2-20 UNF-3A AN 37° flare | 1/2-20 UNF-3B AN 37° flare | 1/2-20 UNF | 3A male, 3B female (AN) | 7.94 mm | 11.88 mm | 11.14 mm | 11.33 mm | 9.40 mm | 29/64 (11.43 mm) | 37° flare, std bore 5.94 mm | 5,000 psi |
| -6 | 9/16-18 UNF-3A AN 37° flare | 9/16-18 UNF-3B AN 37° flare | 9/16-18 UNF | 3A male, 3B female (AN) | 9.52 mm | 13.37 mm | 12.56 mm | 12.76 mm | 10.16 mm | 1/2 (12.88 mm) | 37° flare, std bore 7.54 mm | 5,000 psi |
| -8 | 3/4-16 UNF-3A AN 37° flare | 3/4-16 UNF-3B AN 37° flare | 3/4-16 UNF | 3A male, 3B female (AN) | 12.70 mm | 18.02 mm | 17.10 mm | 17.33 mm | 11.94 mm | 11/16 (17.46 mm) | 37° flare, std bore 9.93 mm | 4,500 psi |
| -10 | 7/8-14 UNF-3A AN 37° flare | 7/8-14 UNF-3B AN 37° flare | 7/8-14 UNF | 3A male, 3B female (AN) | 15.88 mm | 21.05 mm | 20.00 mm | 20.26 mm | 13.46 mm | 51/64 (20.41 mm) | 37° flare, std bore 12.29 mm | 3,500 psi |
| -12 | 1 1/16-12 UN-3A AN 37° flare | 1 1/16-12 UN-3B AN 37° flare | 1 1/16-12 UN | 3A male, 3B female (AN) | 19.05 mm | 25.61 mm | 24.39 mm | 24.70 mm | 15.24 mm | 63/64 (24.87 mm) | 37° flare, std bore 15.47 mm | 3,500 psi |
| -16 | 1 5/16-12 UN-3A AN 37° flare | 1 5/16-12 UN-3B AN 37° flare | 1 5/16-12 UN | 3A male, 3B female (AN) | 25.40 mm | 31.96 mm | 30.74 mm | 31.05 mm | 16.00 mm | 1 15/64 (31.22 mm) | 37° flare, std bore 21.44 mm | 3,000 psi |
| -20 | 1 5/8-12 UN-3A AN 37° flare | 1 5/8-12 UN-3B AN 37° flare | 1 5/8-12 UN | 3A male, 3B female (AN) | 31.75 mm | 39.90 mm | 38.68 mm | 38.98 mm | 17.53 mm | 1 35/64 (39.16 mm) | 37° flare, std bore 27.38 mm | 2,500 psi |
| -24 | 1 7/8-12 UN-3A AN 37° flare | 1 7/8-12 UN-3B AN 37° flare | 1 7/8-12 UN | 3A male, 3B female (AN) | 38.10 mm | 46.25 mm | 45.03 mm | 45.33 mm | 17.53 mm | 1 51/64 (45.51 mm) | 37° flare, std bore 33.32 mm | 2,000 psi |
| -32 | 2 1/2-12 UN-3A AN 37° flare | 2 1/2-12 UN-3B AN 37° flare | 2 1/2-12 UN | 3A male, 3B female (AN) | 50.80 mm | 62.13 mm | 60.90 mm | 61.21 mm | 19.05 mm | 2 27/64 (61.38 mm) | 37° flare, std bore 45.24 mm | 1,500 psi |
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