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MB1351A21 ✓ 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. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-154-9042, 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
MB1351A21
NSN: 5330-00-154-9042
FSC: 5330
CAGE: 20263 — MKT GEOTECHNICAL SYSTEMS (USA)
SPECIFICATIONS
Part NumberMB1351A21
NSN5330-00-154-9042
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MB1351A21 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
920012-4Interchangeable
interchangeable cross-reference
interchangeable
13599Interchangeable
interchangeable cross-reference
interchangeable
100610Interchangeable
interchangeable cross-reference
interchangeable
138526Interchangeable
interchangeable cross-reference
interchangeable
MILW6986TYPEAInterchangeable
interchangeable cross-reference
interchangeable
BS4-2158PC8Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MB1351A21?
MB1351A21 is a SEAL,PLAIN ENCASED.
What parts can replace MB1351A21?
There are 25 known substitutes for MB1351A21: 920012-4, 13599, 100610 and 22 more. Substitute compatibility should be verified for your specific system.
Is MB1351A21 still available?
MB1351A21 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