DETAIL SPECIFICATION SHEET
NUT, TUBE COUPLING, SHORT
INCH-POUND · AN818 Rev 20 · 16 February 2010 · Superseding AN818 Rev 19, 15 June 1994 · AMSC N/A · FSC 4730
FIGURE 1. Nut, tube coupling.
FIGURE 1. Nut, tube coupling – Continued.
| Dash number | Tube OD inches (mm) |
Thread T SAE-AS8879 |
A dia. +.003 (0.08) -.000 inches (mm) |
B inches (mm) |
C dia. +.000 -.010 (0.3) inches (mm) |
|---|---|---|---|---|---|
| -2 | .125 (3.18) | .3125 – 24UNJF -3B | .180 (4.57) | .109 (2.77) | .375 (9.53) |
| -3 | .188 (4.78) | .3750 – 24UNJF -3B | .242 (6.15) | .141 (3.58) | .437 (11.10) |
| -4 | .250 (6.35) | .4375 – 20UNJF -3B | .305 (7.75) | .125 (3.18) | .562 (14.27) |
| -5 | .313 (7.95) | .5000 – 20UNJF -3B | .374 (9.50) | .125 (3.18) | .625 (15.88) |
| -6 | .375 (9.53) | .5625 – 18UNJF – 3B | .440 (11.18) | .156 (3.96) | .687 (17.45) |
| -8 | .500 (12.70) | .7500 – 16UNJF – 3B | .570 (14.48) | .156 (3.96) | .875 (22.23) |
| -10 | .625 (15.88) | .8750 – 14UNJF – 3B | .698 (17.73) | .172 (4.37) | 1.000 (25.40) |
| -12 | .750 (19.05) | 1.0625 – 12UNJ – 3B | .834 (21.18) | .125 (3.18) | 1.250 (31.75) |
| -16 | 1.000 (25.40) | 1.3125 – 12UNJ – 3B | 1.089 (27.66) | .219 (5.56) | 1.500 (38.10) |
| -20 | 1.250 (31.75) | 1.6250 -12UNJ – 3B | 1.347 (34.21) | .312 (7.92) | 2.000 (50.80) |
| -24 | 1.500 (38.10) | 1.8750 – 12UNJ – 3B | 1.617 (41.07) | .359 (9.12) | 2.250 (57.15) |
| -28 | 1.750 (44.45) | 2.2500 – 12UNJ – 3B | 1.890 (48.01) | .375 (9.53) | 2.625 (66.68) |
| -32 | 2.000 (50.80) | 2.500 – 12UNJ – 3B | 2.167 (55.04) | .438 (11.13) | 2.875 (73.03) |
| -40 | 2.500 (63.50) | 3.000 – 12UNJ – 3B | 2.667 (67.74) | .406 (10.31) | 3.375 (85.73) |
| -48 | 3.000 (76.20) | 3.500 – 12UNJ – 3B | 3.180 (80.77) | .438 (11.13) | 4.000 (101.60) |
| Dash number | H dia. +.031 (0.79) -.000 inches (mm) |
J inches (mm) |
L inches (mm) |
M inches (mm) |
N | |
|---|---|---|---|---|---|---|
| -2 | .312 (7.92) | .312 (7.92) | .460 (11.68) | .542 (13.77) | ±.003 (0.08) | .010 (0.25) |
| -3 | .375 (9.53) | .375 (9.53) | .506 (12.85). | .604 (15.34) | ||
| -4 | .438 (11.13) | .406 (10.31) | .532 (13.51) | .620 (15.75) | ||
| -5 | .500 (12.70) | .484 (12.39) | .579 (14.71) | .683 (17.35) | ||
| -6 | .562 (14.27) | .500 (12.70) | .603 (15.32) | .724 (18.39) | ±.010 (0.25) | |
| -8 | .750 (19.05) | .578 (14.68) | .723 (18.36) | .849 (21.56) | ||
| -10 | .875 (22.23) | .688 (17.48) | .817 (20.75) | .974 (24.74) | ||
| -12 | 1.062 (26.97) | .750 (19.05) | .868 (22.05) | 1.021 (25.93) | ||
| -16 | 1.312 (33.32) | .766 (19.46) | .962 (24.43) | 1.131 (28.73) | ||
| -20 | 1.625 (41.28) | .766 (19.46) | 1.017 (25.83) | 1.224 (31.09) | ||
| -24 | 1.875 (47.63) | .875 (22.23) | 1.170 (29.72) | 1.412 (35.86) | ||
| -28 | 2.250 (57.15) | 1.000 (25.40) | 1.316 (33.43) | 1.568 (39.83) | .015 (0.38) | |
| -32 | 2.500 (63.50) | 1.078 (27.38) | 1.462 (37.13) | 1.740 (44.20) | ||
| -40 | 3.000 (76.20) | .969 (24.61) | 1.328 (33.73) | 1.631 (41.43) | ||
| -48 | 3.500 (88.90) | 1.063 (27.00) | 1.452 (36.88) | 1.756 (44.60) | ||
| Dash number | P inches (mm) |
Q min inches (mm) |
R rad inches (mm) |
S max inches (mm) |
U inches (mm) |
|
|---|---|---|---|---|---|---|
| -2 | .375 (9.53) | +.003 (0.08) -.004 (0.10) |
.251 (6.38) | .031 (0.79) | .376 (9.55) | .005 (0.13) |
| -3 | .438 (11.13) | .338 (8.59) | .031 (0.79) | .428 (10.87) | ||
| -4 | .563 (14.30) | .380 (9.65) | .031 (0.79) | .500 (12.70) | ||
| -5 | .625 (15.88) | .401 (10.19) | .031 (0.79) | .542 (13.77) | ||
| -6 | .688 (17.48) | .413 (10.49) | .047 (1.19) | .569 (14.45) | .010 (0.25) | |
| -8 | .875 (22.23) | .484 (12.29) | .047 (1.19) | .647 (16.43) | ||
| -10 | 1.000 (25.40) | .542 (13.77) | .047 (1.19) | .727 (18.47) | ||
| -12 | 1.250 (31.75) | .537 (13.64) | .062 (1.57) | .753 (19.13) | ||
| -16 | 1.500 (38.10) | .563 (14.30) | .078 (1.98) | .813 (20.65) | ||
| -20 | 2.000 (50.80) | ±.016 (0.41) | .094 (2.39) | |||
| -24 | 2.250 (57.15) | ±.020 (0.51) | .661 (16.79) | .094 (2.39) | .911 (23.14) | |
| -28 | 2.625 (66.68) | .730 (18.54) | .094 (2.39) | .930 (23.62) | .015 (0.38) | |
| -32 | 2.875 (73.03) | .844 (21.44) | .109 (2.77) | 1.094 (27.79) | ||
| -40 | 3.375 (85.73) | .718 (18.24) | .109 (2.77) | .968 (24.59) | ||
| -48 | 4.000 (101.60) | .781 (19.84) | .109 (2.77) | 1.031 (26.19) | ||
NOTES:
- Dimensions are in inches.
- Metric equivalents are given for information only.
- Unless otherwise specified, tolerances: Decimals ±.005 inch (0.13 mm), angles ±5°
- Radius or break all corners .005 +.005/-.000 inch (0.13 +0.13/-0.00 mm).
- Remove all burrs and slivers.
- Safety wire holes and location in accordance with SAE-AS1043.
- For design features purposes, this standard takes precedence over documents referenced herein.
REQUIREMENTS
Dimensions and configurations: See figure 1.
Material: See table I, alloys in accordance with SAE-AS4841.
TABLE I. Material and nut alloys.
| Nut AN818 | ||
|---|---|---|
| Designator | Material | Alloy |
| Blank | Steel | 1137 or 4130 |
| J | CRES | 304 |
| K | CRES | 316 |
| T 1/ | Titanium | 64AI-4V |
| W | Aluminum | 7075-T73 |
1/ Not for use with oxygen or potable water.
Finish: In accordance with SAE-AS4841.
When specified dry film lubricant in accordance with MIL-PRF-46010 on all internal surfaces. Applicable only to material designators J or K. Over spray on C dimension is permitted, see figure 1.
PART IDENTIFICATION NUMBER (PIN) SPECIFICATION
PIN Examples:
AN818-8W identifies a nut assembly .500 inch (tube), without lock wire holes, aluminum (7075-T73).
AN818-L8K identifies a nut assembly .500 inch (tube), drilled for lockwire, CRES (316).
AN818-L8JN identifies a nut assembly .500 inch (tube), with lock wire holes, CRES (304), coated internally with solid film lubricant (J and K materials only).
GENERAL GUIDANCE
Supersession data: Aluminum alloys 2014 and 2024 “D” designator have been replaced by aluminum alloy 7075. Use the “W” designator.
Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.