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PartsTable / COMPONENT / 125-3720
125-3720 ✓ 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: STEEL, overall_height: 0.167 INCHES NOMINAL IN, style_designator: IRREGULAR, end_hole_diameter: 0.400 INCHES NOMINAL IN, surface_treatment: ZINC, body_inside_diameter: 1.320 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-980-1367, 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
125-3720
NSN: 5340-00-980-1367
FSC: 5340
CAGE: 93742 — DRS NAVAL POWER SYSTEMS INC DBA DRS POWER & CONTROL TECHNOLOGIES INC (USA)
SPECIFICATIONS
materialSTEEL
overall_height0.167 INCHES NOMINAL IN
style_designatorIRREGULAR
end_hole_diameter0.400 INCHES NOMINAL IN
surface_treatmentZINC
body_inside_diameter1.320 INCHES NOMINAL IN
body_outside_diameter1.414 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
NSN5340-00-980-1367
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 125-3720 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
•
BODY INSIDE DIAMETER: 1.320 INCHES NOMINAL IN
•
END HOLE DIAMETER: 0.400 INCHES NOMINAL IN
•
SURFACE TREATMENT: ZINC
•
STYLE DESIGNATOR: IRREGULAR
•
MATERIAL: STEEL
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
BODY OUTSIDE DIAMETER: 1.414 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER1.320 INCHES NOMINAL IN
OVERALL HEIGHT0.167 INCHES NOMINAL IN
END HOLE DIAMETER0.400 INCHES NOMINAL IN
SURFACE TREATMENTZINC
STYLE DESIGNATORIRREGULAR
MATERIALSTEEL
CASEHARDENING INDICATORNOT CASEHARDENED
BODY OUTSIDE DIAMETER1.414 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
71182Interchangeable
interchangeable cross-reference
interchangeable
7118Interchangeable
interchangeable cross-reference
interchangeable
1942282Interchangeable
Same NIIN cross-reference
interchangeable
R21571Interchangeable
Same NIIN cross-reference
interchangeable
IPD4M1827Interchangeable
Same NIIN cross-reference
interchangeable
4M1827Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 125-3720?
125-3720 is a RETAINER,HELICAL COMPRESSION SPR.
What parts can replace 125-3720?
There are 6 known substitutes for 125-3720: 71182, 7118, 1942282 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 125-3720?
125-3720 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-980-1367. 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