PartsTable
Technical Data Sheet
Download PDF

6640797 — TAILPIECE,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

6640797: TAILPIECE,UNION.

The TAILPIECE,UNION is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 715, seat_type: STRAIGHT FACE, thread_size: 1/2-14, overall_length: 1.060 INCHES NOMINAL IN, special_features: 150 DEGREE WORKING TEMP, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-412-6841, 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
6640797
NSN: 4730-01-412-6841
NIINs: 014126841, 014172819, 014176210, 014176214, 014176215
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY 715
seat_typeSTRAIGHT FACE
thread_size1/2-14
overall_length1.060 INCHES NOMINAL IN
special_features150 DEGREE WORKING TEMP
thread_directionRIGHT-HAND
end_connection_typeWELDED
screw_thread_locationEXTERNAL
union_outside_diameter1.499 INCHES NOMINAL IN
end_item_identificationSEAWOLF CLASS SSN
nominal_pipe_size_designation0.500 INCHES IN
screw_thread_series_designatorNPTF
NSN4730-01-412-6841
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 6640797 · 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
•
UNION OUTSIDE DIAMETER: 1.633 INCHES NOMINAL IN
•
NOMINAL PIPE SIZE DESIGNATION: 0.500 INCHES IN
•
END CONNECTION TYPE: SWEAT SOLDER
•
SEAT TYPE: GASKET
TECHNICAL CHARACTERISTICS
UNION OUTSIDE DIAMETER1.633 INCHES NOMINAL IN
NOMINAL PIPE SIZE DESIGNATION0.500 INCHES IN
END CONNECTION TYPESWEAT SOLDER
OVERALL LENGTH1.440 INCHES NOMINAL IN
SEAT TYPEGASKET
SUBSTITUTES & CROSS-REFERENCES 1
801-6640797PC11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 6640797?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 6640797?
6640797 is a TAILPIECE,UNION.
What parts can replace 6640797?
There is 1 known substitute for 6640797: 801-6640797PC11. Substitute compatibility should be verified for your specific system.
What is the NSN for 6640797?
6640797 is cataloged in the U.S. Government catalog under NSN 4730-01-412-6841. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 6640797

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.