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Technical Data Sheet
PartsTable / COMPONENT / 81-LB-04
81-LB-04 ✓ 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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include shape: RECTANGULAR, length: 120.000 INCHES NOMINAL IN, material: STEEL COMP 316 SINGLE TUBING SEGMENT, lens_color: COLORLESS, body_length: 0.600 INCHES MAXIMUM IN, temp_rating: -85.0 FAHRENHEIT AND 500.0 FAHRENHEIT DEGF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-8368, 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
81-LB-04
NSN: 4730-00-278-8368
FSC: 4730
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
shapeRECTANGULAR
length120.000 INCHES NOMINAL IN
materialSTEEL COMP 316 SINGLE TUBING SEGMENT
lens_colorCOLORLESS
body_length0.600 INCHES MAXIMUM IN
temp_rating-85.0 FAHRENHEIT AND 500.0 FAHRENHEIT DEGF
flange_styleCOVER TYPE SINGLE FLANGE
core_diameter0.063 INCHES NOMINAL IN
core_materialSTEEL
inside_radius0.170 INCHES NOMINAL IN
overall_width24.000 INCHES NOMINAL IN
rating_methodELECTRICAL SINGLE COMPONENT SINGLE WINDING
NSN4730-00-278-8368
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 81-LB-04 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
7024Interchangeable
interchangeable cross-reference
interchangeable
MILF24361SYM311Interchangeable
interchangeable cross-reference
interchangeable
C7024Interchangeable
interchangeable cross-reference
interchangeable
7-116SInterchangeable
interchangeable cross-reference
interchangeable
116157Interchangeable
interchangeable cross-reference
interchangeable
99-4000-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81-LB-04?
81-LB-04 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 81-LB-04?
There are 17 known substitutes for 81-LB-04: 7024, MILF24361SYM311, C7024 and 14 more. Substitute compatibility should be verified for your specific system.
Is 81-LB-04 still available?
81-LB-04 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