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Technical Data Sheet
PartsTable / COMPONENT / 81-5145
81-5145 ✓ 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 EXPANSION JOINT,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL FLANGE, joint_type: DOUBLE, design_type: CORRUGATED ELEMENT, overall_length: 14.000 INCHES NOMINAL IN, bolt_hole_diameter: 0.812 INCHES NOMINAL IN, end_connection_type: FLANGED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-872-1389, 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
81-5145
NSN: 4730-00-872-1389
FSC: 4730
CAGE: 98769 — SENIOR OPERATIONS LLC DIV SENIOR AEROSPACE SSP (USA)
SPECIFICATIONS
materialSTEEL FLANGE
joint_typeDOUBLE
design_typeCORRUGATED ELEMENT
overall_length14.000 INCHES NOMINAL IN
sleeve_quantity2
bolt_hole_diameter0.812 INCHES NOMINAL IN
bolt_hole_quantity9
end_connection_typeFLANGED
bolt_circle_diameter7.000 INCHES NOMINAL IN
flange_outside_diameter8.125 INCHES NOMINAL IN
equalization_characteristicSELF-EQUALIZING
nominal_pipe_size_designation3.500 INCHES IN
NSN4730-00-872-1389
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 81-5145 · 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
•
NOMINAL PIPE SIZE DESIGNATION: 3.500 INCHES IN
•
BOLT CIRCLE DIAMETER: 7.000 INCHES NOMINAL IN
•
MATERIAL: STEEL FLANGE
•
BOLT HOLE DIAMETER: 0.812 INCHES NOMINAL IN
•
FLANGE OUTSIDE DIAMETER: 8.125 INCHES NOMINAL IN
•
EQUALIZATION CHARACTERISTIC: SELF-EQUALIZING
•
END CONNECTION TYPE: FLANGED
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL PIPE SIZE DESIGNATION3.500 INCHES IN
BOLT CIRCLE DIAMETER7.000 INCHES NOMINAL IN
MATERIALSTEEL FLANGE
OVERALL LENGTH14.000 INCHES NOMINAL IN
BOLT HOLE DIAMETER0.812 INCHES NOMINAL IN
FLANGE OUTSIDE DIAMETER8.125 INCHES NOMINAL IN
EQUALIZATION CHARACTERISTICSELF-EQUALIZING
END CONNECTION TYPEFLANGED
JOINT TYPEDOUBLE
SLEEVE QUANTITY2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
71750Interchangeable
interchangeable cross-reference
interchangeable
313407Interchangeable
interchangeable cross-reference
interchangeable
102563Interchangeable
interchangeable cross-reference
interchangeable
CELNP014Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81-5145?
81-5145 is a EXPANSION JOINT,PIPE.
What parts can replace 81-5145?
There are 4 known substitutes for 81-5145: 71750, 313407, 102563 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 81-5145?
81-5145 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-872-1389. 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