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AN775-4C ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ADAPTER,STRAIGHT,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321, body_style: PLAIN, overall_length: 1.375 INCHES NOMINAL IN, surface_treatment: PASSIVATE, width_across_flats: 0.684 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN, first_end_seat_angle: 45.0 DEGREES NOMINAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-541-6613, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
AN775-4C
NSN: 4730-00-541-6613
FSC: 4730
CAGE: 81352 — AIR FORCE-NAVY AERONAUTICAL SPECIFICATIONS PROMULGATED BY AERONAUTICAL STANDARDS GROUP
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321
body_stylePLAIN
overall_length1.375 INCHES NOMINAL IN
surface_treatmentPASSIVATE
width_across_flats0.684 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN
first_end_seat_angle45.0 DEGREES NOMINAL
concentric_hole_depth1.156 INCHES NOMINAL IN
first_end_thread_class3A A
first_end_thread_length0.438 INCHES NOMINAL IN
wrenching_feature_styleHEXAGON
concentric_hole_diameter0.172 INCHES NOMINAL IN
minimum_tensile_strength125000 POUNDS PER SQUARE INCH LBS
NSN4730-00-541-6613
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN775-4C · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO BOLT END: 1.188 INCHES NOMINAL IN
•
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER: 0.750 INCHES NOMINAL IN
•
FIRST END THREAD LENGTH: 0.438 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321
•
BODY STYLE: PLAIN
•
CONCENTRIC HOLE DEPTH: 1.156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.375 INCHES NOMINAL IN
FIRST END THREAD DIRECTIONRIGHT-HAND
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO BOLT END1.188 INCHES NOMINAL IN
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER0.750 INCHES NOMINAL IN
FIRST END THREAD LENGTH0.438 INCHES NOMINAL IN
MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OR STEEL COMP 321
BODY STYLEPLAIN
CONCENTRIC HOLE DEPTH1.156 INCHES NOMINAL IN
FIRST RADIAL FLUID HOLE DIAMETER0.188 INCHES NOMINAL IN
DISTANCE FROM FIRST RADIAL HOLE CENTER TO END OF BOLT0.771 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
400590Interchangeable
interchangeable cross-reference
interchangeable
400596Interchangeable
interchangeable cross-reference
interchangeable
MILF5509Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN775-4C?
AN775-4C is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace AN775-4C?
There are 3 known substitutes for AN775-4C: 400590, 400596, MILF5509. Substitute compatibility should be verified for your specific system.
Is AN775-4C still available?
AN775-4C is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026