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Technical Data Sheet
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ST51 ✓ 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 RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include phase: SINGLE/THREE, end_type: INTERNAL THREAD FIRST END, material: IRON MALLEABLE, current_type: AC, excitor_type: SELF-EXCITED, housing_type: INCLOSED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-498-1725, 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
ST51
NSN: 5340-00-498-1725
FSC: 5340
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
phaseSINGLE/THREE
end_typeINTERNAL THREAD FIRST END
materialIRON MALLEABLE
current_typeAC
excitor_typeSELF-EXCITED
housing_typeINCLOSED
largest_width0.374 INCHES SINGLE END IN
mounting_typeSKID SHOCK
overall_width32.000 INCHES NOMINAL IN
inclosure_typeFULLY INCLOSED
overall_height37.000 INCHES NOMINAL IN
overall_length62.000 INCHES NOMINAL IN
NSN5340-00-498-1725
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST51 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 5
ST51Interchangeable
interchangeable cross-reference
interchangeable
8333759Interchangeable
interchangeable cross-reference
interchangeable
7-1003Interchangeable
interchangeable cross-reference
interchangeable
5451Interchangeable
interchangeable cross-reference
interchangeable
200-0070-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST51?
ST51 is a RELAY,ELECTROMAGNETIC.
What parts can replace ST51?
There are 5 known substitutes for ST51: ST51, 8333759, 7-1003 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST51?
ST51 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-498-1725. 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