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PartsTable / COMPONENT / LN45175
LN45175 ✓ 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 LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 1.500 INCHES NOMINAL IN, thread_class: 3B, thread_series: UN, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-419-6280, 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
LN45175
NSN: 4730-01-419-6280
FSC: 4730
CAGE: 62259 — CYLINDER CITY INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height1.500 INCHES NOMINAL IN
thread_class3B
thread_seriesUN
thread_directionRIGHT-HAND
fabrication_methodMACHINED
width_across_flats3.062 INCHES NOMINAL IN
nominal_thread_size1.750 INCHES IN
end_item_identification2350-01-390-4683
thread_quantity_per_inch12
nominal_tube_outside_diameter1.250 INCHES IN
NSN4730-01-419-6280
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: LN45175 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 3.062 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
•
NOMINAL TUBE OUTSIDE DIAMETER: 1.250 INCHES IN
•
THREAD CLASS: 3B
•
NUT STYLE: TUBE FITTING LOCKNUT
•
THREAD QUANTITY PER INCH: 12
•
NUT HEIGHT: 1.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS3.062 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
NOMINAL TUBE OUTSIDE DIAMETER1.250 INCHES IN
THREAD CLASS3B
NUT STYLETUBE FITTING LOCKNUT
THREAD QUANTITY PER INCH12
NUT HEIGHT1.500 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.750 INCHES IN
END ITEM IDENTIFICATION2350-01-390-4683
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
45175Interchangeable
interchangeable cross-reference
interchangeable
640U-2C-240AInterchangeable
interchangeable cross-reference
interchangeable
500GInterchangeable
interchangeable cross-reference
interchangeable
53160Interchangeable
interchangeable cross-reference
interchangeable
1865Interchangeable
interchangeable cross-reference
interchangeable
AS4283Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is LN45175?
LN45175 is a LOCKNUT,TUBE FITTING.
What parts can replace LN45175?
There are 8 known substitutes for LN45175: 45175, 640U-2C-240A, 500G and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for LN45175?
LN45175 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-419-6280. 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