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Technical Data Sheet
MS51920-1-1 ✓ 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: LEATHER CATTLEHIDE AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEALING ELEMENT, case_style: RECESSED, seal_width: 0.250 INCHES NOMINAL IN, housing_bore_diameter: 0.750 INCHES NOMINAL IN, sealing_element_style: ANGULAR, accommodated_shaft_diameter: 0.250 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 5330-01-411-8894, 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
MS51920-1-1
NSN: 5330-01-411-8894
FSC: 5330
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialLEATHER CATTLEHIDE AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEALING ELEMENT
case_styleRECESSED
seal_width0.250 INCHES NOMINAL IN
housing_bore_diameter0.750 INCHES NOMINAL IN
sealing_element_styleANGULAR
accommodated_shaft_diameter0.250 INCHES NOMINAL IN
NSN5330-01-411-8894
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MS51920-1-1 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
HOUSING BORE DIAMETER: 0.750 INCHES NOMINAL IN
SEALING ELEMENT STYLE: ANGULAR
SEAL WIDTH: 0.250 INCHES NOMINAL IN
MATERIAL: LEATHER CATTLEHIDE AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER: 0.250 INCHES NOMINAL IN
CASE STYLE: RECESSED
TECHNICAL CHARACTERISTICS (FLIS)
HOUSING BORE DIAMETER0.750 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR
SEAL WIDTH0.250 INCHES NOMINAL IN
MATERIALLEATHER CATTLEHIDE AND RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER0.250 INCHES NOMINAL IN
CASE STYLERECESSED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
A-A-52524/17-12-2Interchangeable
interchangeable cross-reference
interchangeable
MS51920-12-2Interchangeable
interchangeable cross-reference
interchangeable
A-A-52524Interchangeable
interchangeable cross-reference
interchangeable
MILS45005Interchangeable
interchangeable cross-reference
interchangeable
225856Interchangeable
interchangeable cross-reference
interchangeable
A1205-R-1344Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS51920-1-1?
MS51920-1-1 is a SEAL,PLAIN ENCASED.
What parts can replace MS51920-1-1?
There are 12 known substitutes for MS51920-1-1: A-A-52524/17-12-2, MS51920-12-2, A-A-52524 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS51920-1-1?
MS51920-1-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-411-8894. This indicates validated use in U.S. government and defense supply chains.
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