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Technical Data Sheet
PartsTable / COMPONENT / 74146-21
74146-21 ✓ 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

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, overall_height: 0.1875 INCHES NOMINAL IN, special_features: BORE DOES NOT EXTEND ALL THE WAY THROUGH SEAT, style_designator: SEAT, bore_taper_in_deg: 15.0. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-472-6227, 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
74146-21
NSN: 5340-00-472-6227
FSC: 5340
CAGE: 70142 — AEROIL PRODUCTS CO INC (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
overall_height0.1875 INCHES NOMINAL IN
special_featuresBORE DOES NOT EXTEND ALL THE WAY THROUGH SEAT
style_designatorSEAT
bore_taper_in_deg15.0
first_step_length0.0620 INCHES NOMINAL IN
first_step_diameter0.3830 INCHES NOMINAL IN
second_step_diameter0.5620 INCHES NOMINAL IN
distance_from_end_to_first_step0.0938 INCHES NOMINAL IN
NSN5340-00-472-6227
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 74146-21 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
•
FIRST STEP DIAMETER: 0.3830 INCHES NOMINAL IN
•
SECOND STEP DIAMETER: 0.5620 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.0938 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
BORE TAPER IN DEG: 15.0
TECHNICAL CHARACTERISTICS (FLIS)
FIRST STEP DIAMETER0.3830 INCHES NOMINAL IN
SECOND STEP DIAMETER0.5620 INCHES NOMINAL IN
OVERALL HEIGHT0.1875 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.0938 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
BORE TAPER IN DEG15.0
SPECIAL FEATURESBORE DOES NOT EXTEND ALL THE WAY THROUGH SEAT
MATERIALSTEEL
FIRST STEP LENGTH0.0620 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
5KCP39PGC138SUpgraded Successor
successor cross-reference
successor
HC44VL851Upgraded Successor
successor cross-reference
successor
HC44ME700Upgraded Successor
successor cross-reference
successor
19-130-4282Upgraded Successor
successor cross-reference
successor
9131-001Upgraded Successor
successor cross-reference
successor
6515NCM020564Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 74146-21?
74146-21 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 74146-21?
There are 16 known substitutes for 74146-21: 5KCP39PGC138S, HC44VL851, HC44ME700 and 13 more. Substitute compatibility should be verified for your specific system.
Is 74146-21 still available?
74146-21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026