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NAS1831C5C56 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

NAS1831C5C56: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 2.245 INCHES MINIMUM AND 2.255 INCHES MAXIMUM IN, material: STEEL COMP 303 OVERALL, thread_class: 2B RIGHT INTERNAL, thread_length: 0.375 INCHES MINIMUM RIGHT INTERNAL IN, style_designator: LEFT INTERNAL AND RIGHT INTERNAL THREADS, thread_direction: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD). This part is cataloged in the U.S.

Government catalog under NSN 5340-01-663-7953, 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
NAS1831C5C56
NSN: 5340-01-663-7953
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
length2.245 INCHES MINIMUM AND 2.255 INCHES MAXIMUM IN
materialSTEEL COMP 303 OVERALL
thread_class2B RIGHT INTERNAL
thread_length0.375 INCHES MINIMUM RIGHT INTERNAL IN
style_designatorLEFT INTERNAL AND RIGHT INTERNAL THREADS
thread_directionRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
surface_treatmentPASSIVATE OVERALL
width_across_flats0.307 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN
nominal_thread_size0.1380 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
cross-sectional_shapeHEXAGON
end_item_identification1005-01-554-7379
thread_quantity_per_inch32 RIGHT INTERNAL
NSN5340-01-663-7953
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NAS1831C5C56 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.307 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN
•
LENGTH: 2.245 INCHES MINIMUM AND 2.255 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.375 INCHES MINIMUM LEFT INTERNAL (INCLUDES THRU THREAD) IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT INTERNAL THREADS
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.307 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN
LENGTH2.245 INCHES MINIMUM AND 2.255 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.375 INCHES MINIMUM LEFT INTERNAL (INCLUDES THRU THREAD) IN
THREAD LENGTH0.375 INCHES MINIMUM RIGHT INTERNAL IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT INTERNAL THREADS
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD DIRECTIONRIGHT-HAND RIGHT INTERNAL
NOMINAL THREAD SIZE0.1380 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 NAS1831C5C56?
NAS1831C5C56 is a STANDOFF,THREADED,SPACING.
What is the NSN for NAS1831C5C56?
NAS1831C5C56 is cataloged in the U.S. Government catalog under NSN 5340-01-663-7953. 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.