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Technical Data Sheet
PartsTable / COMPONENT / 993-3557
993-3557 ✓ 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 PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER OVERALL, peripheral_diameter: 2.500 INCHES NOMINAL IN, center_hole_diameter: 2.125 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 5330-00-237-7968, 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
993-3557
NSN: 5330-00-237-7968
FSC: 5330
CAGE: 34914 — HIAB USA INC (USA)
SPECIFICATIONS
materialRUBBER OVERALL
peripheral_diameter2.500 INCHES NOMINAL IN
center_hole_diameter2.125 INCHES NOMINAL IN
NSN5330-00-237-7968
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 993-3557 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
•
CENTER HOLE DIAMETER: 2.125 INCHES NOMINAL IN
•
MATERIAL: RUBBER OVERALL
•
PERIPHERAL DIAMETER: 2.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER2.125 INCHES NOMINAL IN
MATERIALRUBBER OVERALL
PERIPHERAL DIAMETER2.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
8M4671Interchangeable
interchangeable cross-reference
interchangeable
460A10-265Interchangeable
interchangeable cross-reference
interchangeable
636565Interchangeable
interchangeable cross-reference
interchangeable
9255-3Interchangeable
interchangeable cross-reference
interchangeable
25761Interchangeable
interchangeable cross-reference
interchangeable
2800H394Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 993-3557?
993-3557 is a PACKING,PREFORMED.
What parts can replace 993-3557?
There are 13 known substitutes for 993-3557: 8M4671, 460A10-265, 636565 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 993-3557?
993-3557 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-237-7968. 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