PartsTable
Technical Data Sheet
S281-4 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The SWIVEL JOINT,HYDRAULIC is a the manufacturer industrial component. Key specifications include nut_style: HEXAGON, nut_height: 0.266 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND, width_across_flats: 0.438 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-829-2643, 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
S281-4
NSN: 5340-00-829-2643
FSC: 5340
CAGE: 18076 — UMPCO, INC. DBA UMPCO INC (USA)
SPECIFICATIONS
nut_styleHEXAGON
nut_height0.266 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.438 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch20
NSN5340-00-829-2643
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: S281-4 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
MATERIAL THICKNESS: 0.032 INCHES NOMINAL IN
TONGUE HOLE TYPE: ROUND, UNTHREADED
MATERIAL: ALUMINUM ALLOY 2024 BAND
STYLE DESIGNATOR: SINGLE LOOP
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-362 FED SPEC SINGLE MATERIAL RESPONSE BAND
DISTANCE FROM LOOP CENTER TO TONGUE END: 0.705 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.032 INCHES NOMINAL IN
TONGUE HOLE TYPEROUND, UNTHREADED
MATERIALALUMINUM ALLOY 2024 BAND
STYLE DESIGNATORSINGLE LOOP
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-362 FED SPEC SINGLE MATERIAL RESPONSE BAND
MATERIALPLASTIC CUSHION
OVERALL WIDTH0.375 INCHES NOMINAL IN
DISTANCE FROM LOOP CENTER TO TONGUE END0.705 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN LOOP AND MOUNTING HOLE0.517 INCHES NOMINAL IN
DIAMETER0.204 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
1794-031Interchangeable
interchangeable cross-reference
interchangeable
1794-131Interchangeable
interchangeable cross-reference
interchangeable
B80492 REF 2 SIZE 5"Interchangeable
interchangeable cross-reference
interchangeable
3854Interchangeable
interchangeable cross-reference
interchangeable
1788-131Interchangeable
interchangeable cross-reference
interchangeable
1788-031Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S281-4?
S281-4 is a SWIVEL JOINT,HYDRAULIC.
What parts can replace S281-4?
There are 27 known substitutes for S281-4: 1794-031, 1794-131, B80492 REF 2 SIZE 5" and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S281-4?
S281-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-829-2643. This indicates validated use in U.S. government and defense supply chains.
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