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Technical Data Sheet
PartsTable / COMPONENT / 50551S
50551S ✓ 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 SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.310 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, housing_bore_diameter: 3.125 INCHES NOMINAL IN, sealing_element_style: ANGULAR, accommodated_shaft_diameter: 2.312 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-737-2612, 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
50551S
NSN: 5330-00-737-2612
FSC: 5330
CAGE: 01212 — FEDERAL-MOGUL CORP GOVERNMENT SALES DEPT (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.310 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
housing_bore_diameter3.125 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter2.312 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed2600 FEET PER MINUTE FT
NSN5330-00-737-2612
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 50551S 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
•
CASE STYLE: SQUARE
•
HOUSING BORE DIAMETER: 3.125 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULAR
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 2600 FEET PER MINUTE FT
•
MATERIAL: STEEL CASE
•
ACCOMMODATED SHAFT DIAMETER: 2.312 INCHES NOMINAL IN
•
SEAL WIDTH: 0.310 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CASE STYLESQUARE
HOUSING BORE DIAMETER3.125 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR
ACCOMMODATED SHAFT MAXIMUM RATED SPEED2600 FEET PER MINUTE FT
MATERIALSTEEL CASE
ACCOMMODATED SHAFT DIAMETER2.312 INCHES NOMINAL IN
SEAL WIDTH0.310 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
H95013-X42Interchangeable
interchangeable cross-reference
interchangeable
77A3613-42Interchangeable
interchangeable cross-reference
interchangeable
418293-42Interchangeable
interchangeable cross-reference
interchangeable
1561Interchangeable
interchangeable cross-reference
interchangeable
1561GSKT3INInterchangeable
interchangeable cross-reference
interchangeable
31176Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 50551S?
50551S is a SEAL,PLAIN ENCASED.
What parts can replace 50551S?
There are 25 known substitutes for 50551S: H95013-X42, 77A3613-42, 418293-42 and 22 more. Substitute compatibility should be verified for your specific system.
Is 50551S still available?
50551S is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026