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Technical Data Sheet
PartsTable / COMPONENT / 28991-2
28991-2 ✓ 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

PLUG,PROTECTIVE,DUST AND MOISTUR. Key specifications include material: ALUMINUM, drive_type: SERRATED, design_type: THREADED, thread_class: 2A A, overall_diameter: 0.563 INCHES NOMINAL IN, features_provided: BEVELED SEAT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-530-4854, 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
28991-2
NSN: 5340-00-530-4854
FSC: 5340
CAGE: 11599 — TRIUMPH ENGINE CONTROL SYSTEMS LLC (USA)
SPECIFICATIONS
materialALUMINUM
drive_typeSERRATED
design_typeTHREADED
thread_class2A A
overall_diameter0.563 INCHES NOMINAL IN
features_providedBEVELED SEAT
thread_size_and_series/type_designator3/8-24 UNF
NSN5340-00-530-4854
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 28991-2 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
•
FEATURES PROVIDED: BEVELED SEAT
•
MATERIAL: ALUMINUM
•
OVERALL DIAMETER: 0.563 INCHES NOMINAL IN
•
DESIGN TYPE: THREADED
•
THREAD CLASS: 2A A
•
DRIVE TYPE: SERRATED
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 3/8-24 UNF
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDBEVELED SEAT
MATERIALALUMINUM
OVERALL DIAMETER0.563 INCHES NOMINAL IN
DESIGN TYPETHREADED
THREAD CLASS2A A
DRIVE TYPESERRATED
THREAD SIZE AND SERIES/TYPE DESIGNATOR3/8-24 UNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
FP-3Upgraded Successor
successor cross-reference
successor
SP-3Upgraded Successor
successor cross-reference
successor
SMC134494-1Interchangeable
interchangeable cross-reference
interchangeable
L218796-1Interchangeable
interchangeable cross-reference
interchangeable
8169596Interchangeable
interchangeable cross-reference
interchangeable
T#SP3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28991-2?
28991-2 is a PLUG,PROTECTIVE,DUST AND MOISTUR.
What parts can replace 28991-2?
There are 10 known substitutes for 28991-2: FP-3, SP-3, SMC134494-1 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 28991-2?
28991-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-530-4854. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026