Fitting End, Flared, Tube Connection — Design Standard
Gland Cross-Section — Selected Ring
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Port or Fitting End, Internal Straight Thread — Design Standard
Source: SAE Aerospace Standard AS5202, Revision A · Custodian: SAE G-3/G-3B
All dimensions in inches.
Basic No.
AS5202 /9/
Size Code		 Nominal
Tube Size		 T — Thread per
AS8879 Class 3B		 A-.000 / +.015 BMIN THREAD DEPTH CMIN D-.000 / +.005
01--.2500-28-UNJF.359.330.062.264
02.125.3125-24-UNJF.438.482.062.328
03.188.3750-24-UNJF.500.538.125.390
04.250.4375-20-UNJF.562.568.172.454
05.312.5000-20-UNJF.625.568.234.517
06.375.5625-18-UNJF.688.598.297.580
07.438.6250-18-UNJF.750.614.360.643
08.500.7500-16-UNJF.875.714.391.769
09.562.8125-16-UNJ.938.730.438.832
10.625.8750-14-UNJF1.000.802.484.896
11.6881.0000-12-UNJF1.156.877.5471.023
12.7501.0625-12-UNJ1.234.877.6091.086
14.8751.1875-12-UNJ1.362.877.7341.211
161.0001.3125-12-UNJ1.487.877.8441.336
181.1251.5000-12-UNJF1.675.877.9531.524
201.2501.6250-12-UNJ1.800.8771.0781.648
241.5001.8750-12-UNJ2.050.8771.3121.898
281.7502.2500-12-UNJ2.425.8771.5472.273
322.0002.5000-12-UNJ2.675.9071.7812.524
Basic No.
AS5202 /9/
Size Code		 E-.000 / +.015 GMIN /2/ JMIN N
01.063.478.402.002
02.063.602.577.003
03.063.665.583.003
04.075.728.656.003
05.075.790.656.003
06.083.852.709.004
07.094.915.725.004
08.0941.040.834.004
09.1071.102.850.004
10.1071.165.930.004
11.1251.3521.064.004
12.1251.4151.064.004
14.1251.5401.064.004
16.1251.6651.064.004
18.1251.7901.116.004
20.1251.9781.116.004
24.1252.2281.127.006
28.1252.6021.243.006
32.1252.8521.368.006
NOTES:
  1. /1/THIS FITTING END IS DESIGNED FOR USE WITH FITTINGS PER AS4875. THIS STANDARD IS THE FUNCTIONAL EQUIVALENT OF MS33649 AND IS INTENDED TO BE A SUITABLE REPLACEMENT STANDARD.
  2. /2/MINIMUM DIAMETER FLAT SURFACE CLEARANCE PROVISIONS FOR FITTING, WRENCH, FITTING INSTALLATIONS AND TOOL FILLET RADII MUST BE ADDED AS REQUIRED. THE PERPENDICULARITY TO THE THREADS APPLIES ONLY TO THE ØG MINIMUM. G DIAMETER MAY BE REDUCED BY .040 WHEN IT DEFINES THE LIMITS OF A RAISED SURFACE AND WHEN STRENGTH REQUIREMENTS PERMIT.
  3. 3.B DIMENSION IS THE FULL THREAD DEPTH REQUIREMENT FOR BLIND TAP DESIGN.
  4. 4.INTERPRETATION OF DRAWING PER ARP4296.
  5. 5.SURFACE TEXTURE: SYMBOLS PER ASME Y14.36M; REQUIREMENTS PER ASME B46.1. UNLESS OTHERWISE SPECIFIED, MACHINED SURFACES TO BE 125 μin Ra.
  6. 6.BREAK EDGES .003 TO .015 UNLESS OTHERWISE SPECIFIED.
  7. 7.DIMENSIONING AND TOLERANCING: ASME Y14.5M-1994.
  8. 8.DIMENSIONS IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: LINEAR DIMENSIONS ±.005, ANGULAR DIMENSIONS ±0°30'.
  9. /9/EXAMPLE OF DRAWING CALLOUT:
    • TABULATED PART DRAWING: FITTING END PER AS5202
    • INDIVIDUAL PART DRAWING:
                      AS5202-08
                  │      │
                  │      └── SIZE CODE, TUBE SIZE IN .062 INCREMENTS
                  └─────── BASIC NUMBER
  10. 10.NOTE:
    “THIS STANDARD IS USED TO IMPLEMENT INTERNATIONAL STANDARDIZATION AGREEMENTS: NATO STANAG 3510 AND ASCC AIR STD 25/6.

    PLEASE NOTIFY THE FOLLOWING OFFICES WHEN CHANGES ARE MADE OR CONTACT THESE OFFICES FOR INQUIRIES PERTAINING TO THESE AGREEMENTS.

    NORTH ATLANTIC TREATY ORGANIZATION (NATO)
    STANDARDIZATION AGENCY
    'NSA@HQ.NATO.INT'
    TEL - 0032-2-707-5576
    FAX - 0032-707-5718
    1110 BRUSSELS, BELGIUM

    AND

    AIR STANDARDIZATION COORDINATING COMMITTEE
    'ASCCMCAS@PENTAGON.AF.MIL'
    TEL - 1 703 696 8452
    1815 N. FORT MYER DRIVE, SUITE 400
    ARLINGTON, VA 22209-1809, USA.”
  11. 11.THE CHANGE BAR ( | ) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT EDITORIAL CHANGES, HAVE BEEN MADE TO THE PREVIOUS ISSUE OF THIS DOCUMENT. AN (R) SYMBOL TO THE LEFT OF THE DOCUMENT TITLE INDICATES A COMPLETE REVISION OF THE DOCUMENT.
References & Important Notices
  • Source: SAE International, Aerospace Standard AS5202 Revision A — “Port or Fitting End, Internal Straight Thread, Design Standard.” Custodian: SAE G-3/G-3B. Drawings are interpreted in third angle projection.
  • No SAE affiliation or endorsement. SAE International has not participated in the development of this lookup tool and does not approve or endorse it. Verify all dimensions against the current issue of SAE AS5202 before use in design.
  • Tap drill and minor diameter (thread note on the figure). The internal minor diameter is the UNJ minimum of SAE AS8879, D1 min = D − 1.125 P cos 30°, plus the ASME B1.1 Class 3B minor-diameter tolerance, 0.05 P2/3 + 0.03 P/D − 0.002. These limits match the published AS8879D values in Yamawa, Recommended Drill Sizes for Tapping Internal UNJ Threads for every size it lists (1/4-28 through 1-12 UNJF), to within .0007″; see also Walter, Thread pilot hole diameters. Tap drills for 1/4-28 through 1-12 are Yamawa’s. Yamawa does not list 13/16-16 UNJ or the 12-pitch sizes above 1″; for those the drill is the standard size inside the same 3B band, placed as Yamawa places its own (19.20 mm for 13/16-16; the 1/64″ size about one-third into the band for the 12-pitch sizes). Those are calculated, not published — confirm them against the current AS8879 before release. Drills above about 1″ are often replaced by boring to the same diameter.
  • Related standards. Use with flared tube fittings per SAE AS4841; interpret drawings per SAE ARP4296; dimensioning and tolerancing per ASME Y14.5M-1994.
  • Verify critical dimensions. Always confirm fitting-end dimensions against the current SAE AS5202 standard for safety-critical or pressure-containing applications. This tool is a reference aid, not a substitute for engineering judgment.

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