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91780A363 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

91780A363: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 2.500 INCHES NOMINAL IN, material: ALUMINUM OVERALL, thread_class: 2B RIGHT INTERNAL, thread_length: 0.625 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN, special_features: ITEM IS ROCKWELL HARDENED TO B60; TENSILE STRENGTH OF 55 KPI, style_designator: LEFT INTERNAL AND RIGHT INTERNAL THREADS. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-585-9583, 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
91780A363
NSN: 5340-01-585-9583
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
length2.500 INCHES NOMINAL IN
materialALUMINUM OVERALL
thread_class2B RIGHT INTERNAL
thread_length0.625 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
special_featuresITEM IS ROCKWELL HARDENED TO B60; TENSILE STRENGTH OF 55 KPI
style_designatorLEFT INTERNAL AND RIGHT INTERNAL THREADS
thread_directionRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
width_across_flats0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
cross-sectional_shapeHEXAGON
end_item_identificationNAVY CODE 000A7827
thread_quantity_per_inch20 RIGHT INTERNAL
NSN5340-01-585-9583
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 91780A363 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: 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
•
LENGTH: 2.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.625 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT INTERNAL THREADS
•
THREAD DIRECTION: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
•
NOMINAL THREAD SIZE: 0.250 INCHES RIGHT INTERNAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
LENGTH2.500 INCHES NOMINAL IN
THREAD LENGTH0.625 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
THREAD LENGTH0.625 INCHES NOMINAL RIGHT INTERNAL IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT INTERNAL THREADS
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD DIRECTIONRIGHT-HAND RIGHT INTERNAL
NOMINAL THREAD SIZE0.250 INCHES RIGHT INTERNAL IN
NOMINAL THREAD SIZE0.250 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
CROSS-SECTIONAL SHAPEHEXAGON
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 1
113210 REV B ITEM 36Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 91780A363?
91780A363 is a STANDOFF,THREADED,SPACING.
What parts can replace 91780A363?
There is 1 known substitute for 91780A363: 113210 REV B ITEM 36. Substitute compatibility should be verified for your specific system.
What is the NSN for 91780A363?
91780A363 is cataloged in the U.S. Government catalog under NSN 5340-01-585-9583. 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.