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3491-6803 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3491-6803: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 5.744 INCHES MINIMUM AND 5.756 INCHES MAXIMUM IN, diameter: 1.248 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN, groove_width: 2.500 INCHES NOMINAL IN, groove_diameter: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN, left_slot_width: 0.078 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN, special_features: GROOVE ON SLOTTED END. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-078-9814, 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
3491-6803
NSN: 5340-01-078-9814
FSC: 5340 — Hardware, Commercial
CAGE: 13850 — TECHNIPOWER LLC DBA UNIPOWER (USA)
SPECIFICATIONS
length5.744 INCHES MINIMUM AND 5.756 INCHES MAXIMUM IN
diameter1.248 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
groove_width2.500 INCHES NOMINAL IN
groove_diameter0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
left_slot_width0.078 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
special_featuresGROOVE ON SLOTTED END
style_designatorLEFT INTERNAL AND RIGHT INTERNAL THREADS
cross-sectional_shapeROUND
left_counterbore_depth0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
right_counterbore_depth0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
left_counterbore_diameter0.386 INCHES NOMINAL IN
distance_from_end_to_groove0.775 INCHES MINIMUM AND 0.787 INCHES MAXIMUM IN
NSN5340-01-078-9814
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3491-6803 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
•
LEFT COUNTERBORE DEPTH: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
LENGTH: 5.744 INCHES MINIMUM AND 5.756 INCHES MAXIMUM IN
•
LEFT SLOT WIDTH: 0.078 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
•
GROOVE DIAMETER: 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
•
DISTANCE FROM END TO GROOVE: 0.775 INCHES MINIMUM AND 0.787 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT INTERNAL THREADS
•
DIAMETER: 1.248 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
•
RIGHT COUNTERBORE DEPTH: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
LEFT COUNTERBORE DEPTH0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
LENGTH5.744 INCHES MINIMUM AND 5.756 INCHES MAXIMUM IN
LEFT SLOT WIDTH0.078 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
GROOVE DIAMETER0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN
DISTANCE FROM END TO GROOVE0.775 INCHES MINIMUM AND 0.787 INCHES MAXIMUM IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT INTERNAL THREADS
DIAMETER1.248 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
RIGHT COUNTERBORE DEPTH0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
LEFT COUNTERBORE DIAMETER0.386 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPEROUND
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 3491-6803?
3491-6803 is a STANDOFF,THREADED,SPACING.
What is the NSN for 3491-6803?
3491-6803 is cataloged in the U.S. Government catalog under NSN 5340-01-078-9814. 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.