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Technical Data Sheet
ST9M478-1 ✓ 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 BUTTON,PLUG is a the manufacturer industrial component. Key specifications include material: STEEL COMP 301 OR STEEL COMP 302, head_height: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN, overall_height: 0.238 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN, surface_treatment: PASSIVATE, material_document_and_classification: MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-326-4608, 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
ST9M478-1
NSN: 5340-00-326-4608
FSC: 5340
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 301 OR STEEL COMP 302
head_height0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
overall_height0.238 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
prong_quantity2
surface_treatmentPASSIVATE
material_document_and_classificationMIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5340-00-326-4608
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST9M478-1 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
SURFACE TREATMENT: PASSIVATE
PRONG QUANTITY: 2
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE
HEAD HEIGHT: 0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
MATERIAL: STEEL COMP 301 OR STEEL COMP 302
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE
PRONG QUANTITY2
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059 MIL SPEC SINGLE MATERIAL RESPONSE
HEAD HEIGHT0.035 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
OVERALL HEIGHT0.238 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
MATERIALSTEEL COMP 301 OR STEEL COMP 302
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MS20913-2SInterchangeable
interchangeable cross-reference
interchangeable
1459-257Interchangeable
interchangeable cross-reference
interchangeable
225-12Interchangeable
interchangeable cross-reference
interchangeable
A21458-95Interchangeable
interchangeable cross-reference
interchangeable
B9S1 1-2Interchangeable
interchangeable cross-reference
interchangeable
22-1 1-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST9M478-1?
ST9M478-1 is a BUTTON,PLUG.
What parts can replace ST9M478-1?
There are 15 known substitutes for ST9M478-1: MS20913-2S, 1459-257, 225-12 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST9M478-1?
ST9M478-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-326-4608. This indicates validated use in U.S. government and defense supply chains.
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