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SR240 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

SR240: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.6875 INCHES NOMINAL IN, bore_diameter: 0.6250 INCHES NOMINAL IN, overall_height: 0.7188 INCHES NOMINAL IN, special_features: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-353-8745, 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
SR240
NSN: 5340-00-353-8745
FSC: 5340 — Hardware, Commercial
CAGE: 59875 — EATON CORP DBA EATON AEROSPACE JACKSON (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.6875 INCHES NOMINAL IN
bore_diameter0.6250 INCHES NOMINAL IN
overall_height0.7188 INCHES NOMINAL IN
special_featuresNOT CASEHARDENED
style_designatorSEAT
bore_taper_in_deg10.0
first_step_length0.0938 INCHES NOMINAL IN
first_step_diameter1.2188 INCHES NOMINAL IN
chamfer_angle_in_deg10.0
second_step_diameter1.6250 INCHES NOMINAL IN
NSN5340-00-353-8745
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SR240 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: 1.2188 INCHES NOMINAL IN
•
END DIAMETER: 0.6875 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.5312 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
SECOND STEP DIAMETER: 1.6250 INCHES NOMINAL IN
•
BORE TAPER IN DEG: 10.0
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.7188 INCHES NOMINAL IN
FIRST STEP DIAMETER1.2188 INCHES NOMINAL IN
END DIAMETER0.6875 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.5312 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SECOND STEP DIAMETER1.6250 INCHES NOMINAL IN
BORE TAPER IN DEG10.0
FIRST STEP LENGTH0.0938 INCHES NOMINAL IN
SPECIAL FEATURESNOT CASEHARDENED
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 2
K600I219Reference document
Same NSN cross-reference
Reference document — Secondary reference
K600I00219Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SR240?
SR240 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace SR240?
There are 2 known substitutes for SR240: K600I219, K600I00219. Substitute compatibility should be verified for your specific system.
What is the NSN for SR240?
SR240 is cataloged in the U.S. Government catalog under NSN 5340-00-353-8745. 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.