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S278DT-27 — STRAP,RETAINING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

S278DT-27: STRAP,RETAINING.

The STRAP,RETAINING is a the manufacturer industrial component. Key specifications include cushion: INCLUDED, material: ALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED, mounting_pad: INCLUDED, overall_width: 0.750 INCHES NOMINAL IN, overall_length: 3.128 INCHES NOMINAL IN, special_features: OPERATING TEMPERATURES: -65 TO + 350 DEGREES F. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-380-6792, 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
S278DT-27
NSN: 5340-01-380-6792
FSC: 5340 — Hardware, Commercial
CAGE: 18076 — UMPCO, INC. DBA UMPCO INC (USA)
SPECIFICATIONS
cushionINCLUDED
materialALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED
mounting_padINCLUDED
overall_width0.750 INCHES NOMINAL IN
overall_length3.128 INCHES NOMINAL IN
special_featuresOPERATING TEMPERATURES: -65 TO + 350 DEGREES F
style_designatorSADDLE ARCH
material_thickness0.102 INCHES NOMINAL IN
mounting_hole_size0.197 INCHES NOMINAL IN
end_item_identificationPACER DAWN
inside_diameter/arch_length1.673 INCHES MINIMUM AND 1.703 INCHES MAXIMUM IN
distance_between_mounting_hole_centers2.628 INCHES NOMINAL IN
NSN5340-01-380-6792
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S278DT-27 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
•
MOUNTING HOLE SIZE: 0.197 INCHES NOMINAL IN
•
DISTANCE BETWEEN MOUNTING HOLE CENTERS: 2.628 INCHES NOMINAL IN
•
MOUNTING PAD: INCLUDED
•
STYLE DESIGNATOR: SADDLE ARCH
•
MATERIAL THICKNESS: 0.102 INCHES NOMINAL IN
•
CUSHION: INCLUDED
TECHNICAL CHARACTERISTICS
MOUNTING HOLE SIZE0.197 INCHES NOMINAL IN
DISTANCE BETWEEN MOUNTING HOLE CENTERS2.628 INCHES NOMINAL IN
MOUNTING PADINCLUDED
STYLE DESIGNATORSADDLE ARCH
OVERALL LENGTH3.128 INCHES NOMINAL IN
OVERALL WIDTH0.750 INCHES NOMINAL IN
MATERIAL THICKNESS0.102 INCHES NOMINAL IN
CUSHIONINCLUDED
DISTANCE BETWEEN BASE AND INSIDE OF ARCH4.145 INCHES NOMINAL IN
SPECIAL FEATURESOPERATING TEMPERATURES: -65 TO + 350 DEGREES F
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 2
5340-016D27TSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
S27DT27Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is S278DT-27?
S278DT-27 is a STRAP,RETAINING.
What parts can replace S278DT-27?
There are 2 known substitutes for S278DT-27: 5340-016D27T, S27DT27. Substitute compatibility should be verified for your specific system.
What is the NSN for S278DT-27?
S278DT-27 is cataloged in the U.S. Government catalog under NSN 5340-01-380-6792. 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.