DETAIL SPECIFICATION SHEET
BOLT – FLARED TUBE FITTING END UNIVERSAL
INCH-POUND · AN774 Rev 8 · 19 July 2011 · Superseding AN774 Rev 7, 4 August 1983 · AMSC N/A · FSC 4730
FIGURE 1. Bolt – flared tube dimensions and configurations.
| Inches | mm |
|---|---|
| .002 | 0.05 |
| .005 | 0.13 |
| .010 | 0.25 |
| .016 | 0.41 |
| .025 | 0.64 |
FIGURE 1. Bolt – flared tube dimensions and configurations – Continued.
| Dash number | Tubing OD inches (mm) |
Thread T (Ref) SAE-AS8879 |
A Dia. +.000 -.004 (0.10) inches (mm) |
B ±.010 (0.25) inches (mm) |
C ±.015 (0.38) inches (mm) |
|---|---|---|---|---|---|
| -4 | .250 (6.35) | .4375-20UNJF-3A | .435 (11.05) | .781 (19.84) | .438 (11.13) |
| -5 | .313 (7.95) | .5000-20UNJF-3A | .498 (12.65) | .781 (19.84) | .438 (11.13) |
| -6 | .375 (9.53) | .5625-18UNJF-3A | .560 (14.22) | .875 (22.23) | .469 (11.91) |
| -8 | .500 (12.70) | .750-16UNJF-3A | .748 (19.00) | 1.094 (27.79) | .563 (14.30) |
| -10 | .625 (15.88) | .8750-14UNJF-3A | .873 (22.17) | 1.250 (31.75) | .594 (15.09) |
| -12 | .750 (19.05) | 1.0625-12UNJ-3A | 1.060 (26.92) | 1.468 (37.29) | .656 (16.66) |
| -16 | 1.000 (25.40) | 1.3125-12UNJ-3A | 1.310 (33.27) | 1.687 (42.85) | .656 (16.66) |
| Dash number | D ±.015 (0.38) inches (mm) |
E ±.015 (.038) inches (mm) |
F Dia. +010 (0.25) -.000 (see note 7) inches (mm) |
G Hex (ref) (see note 5) inches (mm) |
L Dia. .015 (0.38) inches (mm) |
|---|---|---|---|---|---|
| -4 | 1.188 (30.18) | 1.922 (48.82) | .469 (11.91) | .688 (17.48) | .344 (8.74) |
| -5 | 1.188 (30.18) | 1.922 (48.82) | .531 (13.49) | .750 (19.05) | .406 (10.31) |
| -6 | 1.344 (34.14) | 2.125 (53.98) | .594 (15.09) | .813 (20.65) | .469 (11.91) |
| -8 | 1.688 (42.88) | 2.594 (65.89) | .781 (19.84) | 1.000 (25.40) | .625 (15.88) |
| -10 | 1.969(50.01) | 3.000 (76.20) | .906 (23.01) | 1.125 (28.58) | .750 (19.05) |
| -12 | 2.313 (58.75) | 3.484 (88.49) | 1.094 (27.79) | 1.375 (34.93) | .938 (23.83) |
| -16 | 2.813 (71.45) | 4.094 (103.99) | 1.344 (34.14) | 1.625 (41.28) | 1.188 (30.18) |
| Dash number | M Dia. .015 (0.38) inches (mm) |
N Dia. (ref) (see note 5) inches (mm) |
|---|---|---|
| -4 | .188 (4.78) | .172 (4.37) |
| -5 | .219 (5.56) | .234 (5.94) |
| -6 | .250 (6.35) | .297 (7.54) |
| -8 | .313 (7.95) | .391 (9.93) |
| -10 | .375 (9.53) | .484 (12.29) |
| -12 | .438 (11.13) | .609 (15.47) |
| -16 | .625 (15.88) | .844 (21.44) |
NOTES:
- Dimensions are in inches.
- Metric equivalents are given for information only.
- Break sharp edges .and remove all hanging burrs and slivers.
- Unless otherwise noted tolerances shall be ±.005 inches (0.13 mm) and angles ±.5°.
- Tolerances for dimensions G and N are in accordance with SAE-AS4395 style E.
- Machined surfaces shall be smooth to 125µin Ra, hex surfaces may be 250µin Ra, unless otherwise specified on the figures. Surface finish shall be in accordance with ASME B46.1.
- Diameter F is last pitch diameter of last serration from point to point.
- For design features purposes, this standard takes precedence over documents referenced herein.
- Referenced documents shall be of the issue in effect on date of invitation for bid.
REQUIREMENTS
Dimensions and configuration shall be in accordance with figure 1.
Size -2 through -12 aluminum alloy, steel, corrosion resistant steel (CRES), and titanium maximum operating pressure is 3000 psi (21 MPa). Larger sizes maximum operating pressure is 1500 psi (10 MPa).
Except as otherwise noted materials shall be in accordance with SAE-AS4841, see table I for material code.
TABLE I. Material and code letters.
| Code letter | Material |
|---|---|
| F | Steel alloy 4120 or 4130 In accordance with SAE-AMS6370 or SAE-AMS6382 1/ |
| J | CRES, type 304 |
| K | CRES, type 316 |
| R | CRES, type 321 |
| S | CRES, type 347, cond A |
| T | Titanium alloy 2/ |
| W | Aluminum alloy 7075-T73 |
1/ Steel alloy 125,000 psi (860 MPa) minimum tensile strength.
2/ Not for use in oxygen systems.
Finishes shall be in accordance with SAE-AS4841.
PART IDENTIFICATION NUMBER (PIN) SPECIFICATION
The PIN consists of the letter “AN” the specification sheet number, a letter designator for material type and a dash number for tube size. Unassigned PIN’s shall not be used.
PIN example: AN774W4 indicates a bolt – flared tube, aluminum alloy 7075-T73, .250 inch (6.35 mm) tube.
SUPERSESSION DATA
Due to stress corrosion cracking aluminum alloys 2014 and 2024 “D” designator has been replaced by aluminum alloy 7075 “W” designator example: AN774-D4 use AN774-W4.
Steel dash (-) designator has been replaced by steel alloy “F” designator.
CRES 347 “S” designator had been replaced by the CRES (alloy 321) “R” designator.
TABLE II. Cross-reference data.
| AN PIN (inactive part) |
Thread | Replacement AN PIN (inactive part) |
|---|---|---|
| AN774-4 | .4375 | AN774F4 |
| AN774D4 | .4375 | AN774W4 |
| AN774J4 | .4375 | |
| AN774K4 | .4375 | |
| AN774R4 | .4375 | |
| AN774S4 | .4375 | AN774R4 |
| AN774T4 | .4375 | |
| AN774W4 | .4375 | |
| AN774-5 | .2500 | AN774F5 |
| AN774D5 | .2500 | AN774W5 |
| AN774J5 | .2500 | |
| AN774K5 | .2500 | |
| AN774R5 | .2500 | |
| AN774S5 | .2500 | AN774R5 |
| AN774T5 | .2500 | |
| AN774W5 | .2500 | |
| AN774-6 | .5000 | AN774F6 |
| AN774D6 | . 5000 | AN774W6 |
| AN774J6 | . 5000 | |
| AN774K6 | . 5000 | |
| AN774R6 | . 5000 | |
| AN774S6 | . 5000 | AN774R6 |
| AN774T6 | . 5000 | |
| AN774W6 | . 5000 | |
| AN774-8 | .5625 | AN774F8 |
| AN774D8 | .5625 | AN774W8 |
| AN774J8 | .5625 | |
| AN774K8 | .5625 | |
| AN774R8 | .5625 | |
| AN774S8 | .5625 | AN774R8 |
| AN774T8 | .5625 | |
| AN774W8 | .5625 | |
| AN774-10 | .7500 | AN774F10 |
| AN774D10 | .7500 | AN774W10 |
| AN774J10 | .7500 | |
| AN774K10 | .7500 | |
| AN774R10 | .7500 | |
| AN774S10 | .7500 | AN774R10 |
| AN774T10 | .7500 | |
| AN774W10 | .7500 | |
| AN774-12 | .8750 | AN774F12 |
| AN774D12 | .8750 | AN774W12 |
| AN774J12 | .8750 | |
| AN774K12 | .8750 | |
| AN774R12 | .8750 | |
| AN774S12 | .8750 | AN774R12 |
| AN774T12 | .8750 | |
| AN774W12 | .8750 | |
| AN774-16 | 1.3125 | AN774F16 |
| AN774D16 | 1.3125 | AN774W16 |
| AN774J16 | 1.3125 | |
| AN774K16 | 1.3125 | |
| AN774R16 | 1.3125 | |
| AN774S16 | 1.3125 | AN774R16 |
| AN774T16 | 1.3125 | |
| AN774W16W | 1.3125 |
GENERAL GUIDANCE
Changes from previous issues. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.