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Technical Data Sheet
DEI-1258 ✓ 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

RETAINER,HELICAL COMPRESSION SPR. Key specifications include material: PLASTIC POLYTETRAFLUOROETHYLENE, lip_thickness: 0.310 INCHES NOMINAL IN, overall_height: 1.000 INCHES NOMINAL IN, flange_diameter: 2.870 INCHES NOMINAL IN, flange_thickness: 0.120 INCHES NOMINAL IN, style_designator: IRREGULAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-067-5089, 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
DEI-1258
NSN: 5340-01-067-5089
FSC: 5340
CAGE: 55650 — DOWN EAST, INC. (USA)
SPECIFICATIONS
materialPLASTIC POLYTETRAFLUOROETHYLENE
lip_thickness0.310 INCHES NOMINAL IN
overall_height1.000 INCHES NOMINAL IN
flange_diameter2.870 INCHES NOMINAL IN
flange_thickness0.120 INCHES NOMINAL IN
style_designatorIRREGULAR
end_hole_diameter0.516 INCHES NOMINAL IN
body_inside_diameter1.503 INCHES MINIMUM AND 1.507 INCHES MAXIMUM IN
body_outside_diameter1.777 INCHES MINIMUM AND 1.778 INCHES MAXIMUM IN
casehardening_indicatorNOT CASEHARDENED
material_document_and_classificationMIL-P-19468, GROUP B MIL SPEC SINGLE MATERIAL RESPONSE
NSN5340-01-067-5089
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: DEI-1258 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
CASEHARDENING INDICATOR: NOT CASEHARDENED
LIP THICKNESS: 0.310 INCHES NOMINAL IN
END HOLE DIAMETER: 0.516 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-P-19468, GROUP B MIL SPEC SINGLE MATERIAL RESPONSE
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE
STYLE DESIGNATOR: IRREGULAR
FLANGE THICKNESS: 0.120 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CASEHARDENING INDICATORNOT CASEHARDENED
LIP THICKNESS0.310 INCHES NOMINAL IN
END HOLE DIAMETER0.516 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-P-19468, GROUP B MIL SPEC SINGLE MATERIAL RESPONSE
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE
STYLE DESIGNATORIRREGULAR
OVERALL HEIGHT1.000 INCHES NOMINAL IN
FLANGE THICKNESS0.120 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.777 INCHES MINIMUM AND 1.778 INCHES MAXIMUM IN
BODY INSIDE DIAMETER1.503 INCHES MINIMUM AND 1.507 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
1258Upgraded Successor
successor cross-reference
successor
10632Interchangeable
interchangeable cross-reference
interchangeable
CE1258Interchangeable
interchangeable cross-reference
interchangeable
1952Interchangeable
interchangeable cross-reference
interchangeable
700088Interchangeable
interchangeable cross-reference
interchangeable
2868541-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DEI-1258?
DEI-1258 is a RETAINER,HELICAL COMPRESSION SPR.
What parts can replace DEI-1258?
There are 22 known substitutes for DEI-1258: 1258, 10632, CE1258 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for DEI-1258?
DEI-1258 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-067-5089. This indicates validated use in U.S. government and defense supply chains.
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