PartsTable
Technical Data Sheet
21257E ✓ 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 STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.600 INCHES NOMINAL IN, material: ALUMINUM ALLOY 2024 OVERALL, style_designator: INTERNALLY THREADED FULL LENGTH, surface_treatment: CHROMATE OVERALL, cross-sectional_shape: ROUND, surface_treatment_document_and_classification: MIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-106-1304, 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
21257E
NSN: 5340-01-106-1304
FSC: 5340
CAGE: 30377 — SMITHS AEROSPACE, INC., ELECTRONIC SYSTEMS-GRAND RAPIDS (USA)
SPECIFICATIONS
length0.600 INCHES NOMINAL IN
materialALUMINUM ALLOY 2024 OVERALL
style_designatorINTERNALLY THREADED FULL LENGTH
surface_treatmentCHROMATE OVERALL
cross-sectional_shapeROUND
surface_treatment_document_and_classificationMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
NSN5340-01-106-1304
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21257E 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
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
SURFACE TREATMENT: CHROMATE OVERALL
MATERIAL: ALUMINUM ALLOY 2024 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
CROSS-SECTIONAL SHAPE: ROUND
LENGTH: 0.600 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
SURFACE TREATMENTCHROMATE OVERALL
MATERIALALUMINUM ALLOY 2024 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541, CLASS 1A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL A
CROSS-SECTIONAL SHAPEROUND
LENGTH0.600 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
S3Y30PLUpgraded Successor
successor cross-reference
successor
212-57Upgraded Successor
successor cross-reference
successor
1880-0002Upgraded Successor
successor cross-reference
successor
101-0-1.5000Interchangeable
interchangeable cross-reference
interchangeable
B94.2Interchangeable
interchangeable cross-reference
interchangeable
7004732Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21257E?
21257E is a STANDOFF,THREADED,SPACING.
What parts can replace 21257E?
There are 11 known substitutes for 21257E: S3Y30PL, 212-57, 1880-0002 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21257E?
21257E is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-106-1304. This indicates validated use in U.S. government and defense supply chains.
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