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Technical Data Sheet
MS51911-42-2 ✓ 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

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT A, case_style: SQUARE, seal_width: 0.688 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN, surface_treatment: CADMIUM OR ZINC CASE, housing_bore_diameter: 3.350 INCHES NOMINAL IN, sealing_element_style: ANGULAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-286-6836, 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
MS51911-42-2
NSN: 5330-00-286-6836
FSC: 5330
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT A
case_styleSQUARE
seal_width0.688 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN
surface_treatmentCADMIUM OR ZINC CASE
housing_bore_diameter3.350 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter2.375 INCHES NOMINAL IN
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE CASE
NSN5330-00-286-6836
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS51911-42-2 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
ACCOMMODATED SHAFT DIAMETER: 2.375 INCHES NOMINAL IN
SEALING ELEMENT STYLE: ANGULAR
HOUSING BORE DIAMETER: 3.350 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE CASE
MATERIAL: RUBBER SYNTHETIC SEALING ELEMENT A
CASE STYLE: SQUARE
SURFACE TREATMENT: CADMIUM OR ZINC CASE
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT DIAMETER2.375 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER3.350 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE CASE
MATERIALRUBBER SYNTHETIC SEALING ELEMENT A
MATERIALRUBBER SYNTHETIC SEALING ELEMENT B
CASE STYLESQUARE
SURFACE TREATMENTCADMIUM OR ZINC CASE
SEAL WIDTH0.688 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
511-152Interchangeable
interchangeable cross-reference
interchangeable
500152Interchangeable
interchangeable cross-reference
interchangeable
302016Interchangeable
interchangeable cross-reference
interchangeable
A1805V152Interchangeable
interchangeable cross-reference
interchangeable
MS51911-48-2Interchangeable
interchangeable cross-reference
interchangeable
8438828Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51911-42-2?
MS51911-42-2 is a SEAL,PLAIN ENCASED.
What parts can replace MS51911-42-2?
There are 21 known substitutes for MS51911-42-2: 511-152, 500152, 302016 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51911-42-2?
MS51911-42-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-286-6836. This indicates validated use in U.S. government and defense supply chains.
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