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Technical Data Sheet
PartsTable / COMPONENT / 55370
55370 ✓ Verified by PartsTable
InLine · 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 SPRING ASSEMBLY,LEAF is a InLine industrial component. Key specifications include general_characteristics_item_description: CRES; SECOND STAGE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-018-4884, 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
55370
NSN: 4730-00-018-4884
FSC: 4730
CAGE: 96124 — TRANSDIGM INC DIV AERO FLUID PRODUCTS (USA)
SPECIFICATIONS
general_characteristics_item_descriptionCRES; SECOND STAGE
NSN4730-00-018-4884
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 55370 · InLine ⚠ 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
309GInterchangeable
interchangeable cross-reference
interchangeable
954137Interchangeable
interchangeable cross-reference
interchangeable
603T2Interchangeable
interchangeable cross-reference
interchangeable
D51002Interchangeable
interchangeable cross-reference
interchangeable
55-370Interchangeable
interchangeable cross-reference
interchangeable
7409345Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 55370?
55370 is a SPRING ASSEMBLY,LEAF manufactured by InLine.
What parts can replace 55370?
There are 12 known substitutes for 55370: 309G, 954137, 603T2 and 9 more. Substitute compatibility should be verified for your specific system.
Is 55370 still available?
55370 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