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S19051 ✓ 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 NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: TUBE COUPLING, nut_height: 1.141 INCHES NOMINAL IN, seat_angle: 60.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-288-8449, 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
S19051
NSN: 4730-00-288-8449
FSC: 4730
CAGE: 076M6 — AMZ ALABAMA INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleTUBE COUPLING
nut_height1.141 INCHES NOMINAL IN
seat_angle60.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNS
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
fabrication_methodFORGED OR MACHINED
length_to_shoulder0.969 INCHES NOMINAL IN
width_across_flats1.375 INCHES NOMINAL IN
nominal_thread_size1.187 INCHES IN
NSN4730-00-288-8449
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: S19051 · 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
•
LENGTH TO SHOULDER: 0.969 INCHES NOMINAL IN
•
SEAT ANGLE: 60.00 DEGREES NOMINAL
•
NOMINAL THREAD SIZE: 1.187 INCHES IN
•
WIDTH ACROSS FLATS: 1.375 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
THREAD CLASS: 2B
•
THREAD DIRECTION: RIGHT-HAND
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS (FLIS)
LENGTH TO SHOULDER0.969 INCHES NOMINAL IN
SEAT ANGLE60.00 DEGREES NOMINAL
NOMINAL THREAD SIZE1.187 INCHES IN
WIDTH ACROSS FLATS1.375 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
THREAD CLASS2B
THREAD DIRECTIONRIGHT-HAND
NUT STYLETUBE COUPLING
SMALLEST INSIDE DIAMETER0.783 INCHES NOMINAL IN
NOMINAL TUBE OUTSIDE DIAMETER0.750 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
22020Interchangeable
interchangeable cross-reference
interchangeable
69-773Interchangeable
interchangeable cross-reference
interchangeable
300-12Interchangeable
interchangeable cross-reference
interchangeable
122-660345 PC 30Interchangeable
interchangeable cross-reference
interchangeable
200954Interchangeable
interchangeable cross-reference
interchangeable
122-5277738 ITEM 33Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S19051?
S19051 is a NUT,TUBE COUPLING.
What parts can replace S19051?
There are 21 known substitutes for S19051: 22020, 69-773, 300-12 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S19051?
S19051 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-288-8449. 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