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801-6640820 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

801-6640820: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, nut_style: HEXAGON, nut_height: 1.060 INCHES NOMINAL IN, temp_rating: 160.0 FAHRENHEIT NOMINAL DEGF, thread_class: 2B, thread_series: UN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-412-6842, 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
801-6640820
NSN: 4730-01-412-6842
NIINs: 014126842, 017358413
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
nut_styleHEXAGON
nut_height1.060 INCHES NOMINAL IN
temp_rating160.0 FAHRENHEIT NOMINAL DEGF
thread_class2B
thread_seriesUN
shoulder_width0.230 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats2.188 INCHES NOMINAL IN
nominal_thread_size1.750 INCHES IN
shoulder_step_width0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
shoulder_seat_diameter2.000 INCHES NOMINAL IN
NSN4730-01-412-6842
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 801-6640820 · 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
•
WIDTH ACROSS FLATS: 2.188 INCHES NOMINAL IN
•
SHOULDER STEP WIDTH: 0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
•
SHOULDER WIDTH: 0.230 INCHES NOMINAL IN
•
THREAD SERIES: UN
•
TEMP RATING: 160.0 FAHRENHEIT NOMINAL DEGF
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-B-446 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS2.188 INCHES NOMINAL IN
SHOULDER STEP WIDTH0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
SHOULDER WIDTH0.230 INCHES NOMINAL IN
THREAD SERIESUN
TEMP RATING160.0 FAHRENHEIT NOMINAL DEGF
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-B-446 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.750 INCHES IN
NUT HEIGHT1.060 INCHES NOMINAL IN
NUT STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 4
801-6758238Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
801-6758238PC6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2633-791-04Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
801-6640820ASSY18,PC6Same 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
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FREQUENTLY ASKED QUESTIONS
What is 801-6640820?
801-6640820 is a NUT,UNION.
What parts can replace 801-6640820?
There are 4 known substitutes for 801-6640820: 801-6758238, 801-6758238PC6, 2633-791-04 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 801-6640820?
801-6640820 is cataloged in the U.S. Government catalog under NSN 4730-01-412-6842. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.