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Technical Data Sheet
PartsTable / COMPONENT / L-40339 ITEM 2 3/4IN.
L-40339 ITEM 2 3/4IN. ✓ 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 L-40339 ITEM 2 3/4IN. 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 4730-01-286-4637, 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
L-40339 ITEM 2 3/4IN.
NSN: 4730-01-286-4637
FSC: 4730
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
Part NumberL-40339 ITEM 2 3/4IN.
NSN4730-01-286-4637
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: L-40339 ITEM 2 3/4IN. · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STAINLESS STEEL,3/4 IN. NPT CONNECTION IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTAINLESS STEEL,3/4 IN. NPT CONNECTION IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
CSE405AInterchangeable
interchangeable cross-reference
interchangeable
55440Interchangeable
interchangeable cross-reference
interchangeable
1424 5/8Interchangeable
interchangeable cross-reference
interchangeable
933D055440Interchangeable
interchangeable cross-reference
interchangeable
764-2850Interchangeable
interchangeable cross-reference
interchangeable
2017746Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is L-40339 ITEM 2 3/4IN.?
L-40339 ITEM 2 3/4IN. is a L-40339 ITEM 2 3/4IN..
What parts can replace L-40339 ITEM 2 3/4IN.?
There are 9 known substitutes for L-40339 ITEM 2 3/4IN.: CSE405A, 55440, 1424 5/8 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for L-40339 ITEM 2 3/4IN.?
L-40339 ITEM 2 3/4IN. is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-286-4637. 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