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MC4190 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MC4190: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL CORROSION RESISTING, design_type: SOLID, end_diameter: 0.2000 INCHES NOMINAL IN, bore_diameter: 0.1250 INCHES MINIMUM AND 0.1270 INCHES MAXIMUM IN, overall_height: 0.4150 INCHES NOMINAL IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-787-1141, 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
MC4190
NSN: 5340-00-787-1141
FSC: 5340 — Hardware, Commercial
CAGE: 76050 — EATON AEROSPACE LLC DBA STERER ENGINEERING DIV M.C.AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
design_typeSOLID
end_diameter0.2000 INCHES NOMINAL IN
bore_diameter0.1250 INCHES MINIMUM AND 0.1270 INCHES MAXIMUM IN
overall_height0.4150 INCHES NOMINAL IN
style_designatorSEAT
counterbore_length0.2550 INCHES MINIMUM AND 0.2650 INCHES MAXIMUM IN
first_step_diameter0.3920 INCHES MINIMUM AND 0.3930 INCHES MAXIMUM IN
counterbore_diameter0.3100 INCHES NOMINAL IN
fsc_application_dataVALVE,PLUG 7820007832388 MC2666-1
material_hardness_rating87.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM
distance_from_end_to_first_step0.0450 INCHES NOMINAL IN
NSN5340-00-787-1141
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MC4190 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
•
FSC APPLICATION DATA: VALVE,PLUG 7820007832388 MC2666-1
•
FIRST STEP DIAMETER: 0.3920 INCHES MINIMUM AND 0.3930 INCHES MAXIMUM IN
•
MATERIAL HARDNESS RATING: 87.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM
•
END DIAMETER: 0.2000 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.0450 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.4150 INCHES NOMINAL IN
FSC APPLICATION DATAVALVE,PLUG 7820007832388 MC2666-1
FIRST STEP DIAMETER0.3920 INCHES MINIMUM AND 0.3930 INCHES MAXIMUM IN
MATERIAL HARDNESS RATING87.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 90.0 ROCKWELL SUPERFICIAL 15-N MAXIMUM
END DIAMETER0.2000 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.0450 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
COUNTERBORE LENGTH0.2550 INCHES MINIMUM AND 0.2650 INCHES MAXIMUM IN
COUNTERBORE DIAMETER0.3100 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MC4190?
MC4190 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for MC4190?
MC4190 is cataloged in the U.S. Government catalog under NSN 5340-00-787-1141. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.