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Technical Data Sheet
PartsTable / COMPONENT / 520-13550-1
520-13550-1 ✓ 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 COUPLING,TOLERANCE is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-627-3429, 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
520-13550-1
NSN: 4730-00-627-3429
FSC: 4730
CAGE: 82918 — THE BOEING COMPANY DIV LEGACY WICHITA (USA)
SPECIFICATIONS
general_characteristics_item_descriptionBASIC MATERIAL ALUMINUM ALLOY 2017-T4,ANODIZED MIL-A-8625;7.170 IN. FLANGE OD;6.500 IN. O/A ASSEMBLED LG;C/O 2 FLANGE,2 SLEEVE,4 RING,1 HOSE,AND MISC ATTACHING HARDWARE IN
NSN4730-00-627-3429
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 520-13550-1 · 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
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GENERAL CHARACTERISTICS ITEM DESCRIPTION: BASIC MATERIAL ALUMINUM ALLOY 2017-T4,ANODIZED MIL-A-8625;7.170 IN. FLANGE OD;6.500 IN. O/A ASSEMBLED LG;C/O 2 FLANGE,2 SLEEVE,4 RING,1 HOSE,AND MISC ATTACHING HARDWARE IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONBASIC MATERIAL ALUMINUM ALLOY 2017-T4,ANODIZED MIL-A-8625;7.170 IN. FLANGE OD;6.500 IN. O/A ASSEMBLED LG;C/O 2 FLANGE,2 SLEEVE,4 RING,1 HOSE,AND MISC ATTACHING HARDWARE IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
38120Interchangeable
interchangeable cross-reference
interchangeable
61A12D26Interchangeable
interchangeable cross-reference
interchangeable
8781Interchangeable
interchangeable cross-reference
interchangeable
T251Interchangeable
interchangeable cross-reference
interchangeable
09-38120Interchangeable
interchangeable cross-reference
interchangeable
108327Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520-13550-1?
520-13550-1 is a COUPLING,TOLERANCE.
What parts can replace 520-13550-1?
There are 12 known substitutes for 520-13550-1: 38120, 61A12D26, 8781 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 520-13550-1?
520-13550-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-627-3429. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026