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91780A166 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

91780A166: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN, material: ALUMINUM OVERALL, thread_length: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM RIGHT INTERNAL IN, special_features: 4-40 THREAD, style_designator: INTERNALLY THREADED FULL LENGTH, thread_direction: RIGHT-HAND RIGHT EXTERNAL. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-605-1245, 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
91780A166
NSN: 5340-01-605-1245
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
length0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
materialALUMINUM OVERALL
thread_length0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM RIGHT INTERNAL IN
special_features4-40 THREAD
style_designatorINTERNALLY THREADED FULL LENGTH
thread_directionRIGHT-HAND RIGHT EXTERNAL
width_across_flats0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
cross-sectional_shapeHEXAGON
end_item_identification5805015822366 CENTRAL OFFICE,TELEPHONE,AUTOMATIC
part_name_assigned_by_controlling_agencyALUMINUM FEMALE THREADED HEX STANDOFF
NSN5340-01-605-1245
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 91780A166 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: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
LENGTH: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM RIGHT INTERNAL IN
•
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
•
THREAD DIRECTION: RIGHT-HAND RIGHT EXTERNAL
•
CROSS-SECTIONAL SHAPE: HEXAGON
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
LENGTH0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
THREAD LENGTH0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM RIGHT INTERNAL IN
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
CROSS-SECTIONAL SHAPEHEXAGON
SPECIAL FEATURES4-40 THREAD
PART NAME ASSIGNED BY CONTROLLING AGENCYALUMINUM FEMALE THREADED HEX STANDOFF
END ITEM IDENTIFICATION5805015822366 CENTRAL OFFICE,TELEPHONE,AUTOMATIC
MATERIALALUMINUM OVERALL
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 91780A166?
91780A166 is a STANDOFF,THREADED,SPACING.
What is the NSN for 91780A166?
91780A166 is cataloged in the U.S. Government catalog under NSN 5340-01-605-1245. 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.