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Technical Data Sheet
1537R ✓ 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, end_diameter: 0.5400 INCHES MINIMUM AND 0.5500 INCHES MAXIMUM IN, bore_diameter: 0.4480 INCHES NOMINAL IN, overall_height: 0.3120 INCHES NOMINAL IN, style_designator: SEAT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-777-7189, 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
1537R
NSN: 5340-00-777-7189
FSC: 5340
CAGE: 36367 — P.K. LINDSAY CO., INC. DBA P.K. LINDSAY CO., INC. (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.5400 INCHES MINIMUM AND 0.5500 INCHES MAXIMUM IN
bore_diameter0.4480 INCHES NOMINAL IN
overall_height0.3120 INCHES NOMINAL IN
style_designatorSEAT
features_providedCASEHARDENED
first_step_diameter0.6870 INCHES NOMINAL IN
fsc_application_dataCOMPRESSOR VALVE SPRING SEAT
distance_from_end_to_first_step0.2180 INCHES NOMINAL IN
NSN5340-00-777-7189
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1537R 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
DESIGN TYPE: SOLID
DISTANCE FROM END TO FIRST STEP: 0.2180 INCHES NOMINAL IN
FSC APPLICATION DATA: COMPRESSOR VALVE SPRING SEAT
FEATURES PROVIDED: CASEHARDENED
STYLE DESIGNATOR: SEAT
END DIAMETER: 0.5400 INCHES MINIMUM AND 0.5500 INCHES MAXIMUM IN
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
DESIGN TYPESOLID
DISTANCE FROM END TO FIRST STEP0.2180 INCHES NOMINAL IN
FSC APPLICATION DATACOMPRESSOR VALVE SPRING SEAT
FEATURES PROVIDEDCASEHARDENED
STYLE DESIGNATORSEAT
END DIAMETER0.5400 INCHES MINIMUM AND 0.5500 INCHES MAXIMUM IN
MATERIALSTEEL
OVERALL HEIGHT0.3120 INCHES NOMINAL IN
FIRST STEP DIAMETER0.6870 INCHES NOMINAL IN
BORE DIAMETER0.4480 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
0A-08709-20-SW-SPInterchangeable
interchangeable cross-reference
interchangeable
0A08709SWSPInterchangeable
interchangeable cross-reference
interchangeable
0A0870920Interchangeable
interchangeable cross-reference
interchangeable
1537Interchangeable
interchangeable cross-reference
interchangeable
49104BInterchangeable
interchangeable cross-reference
interchangeable
1537CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1537R?
1537R is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 1537R?
There are 17 known substitutes for 1537R: 0A-08709-20-SW-SP, 0A08709SWSP, 0A0870920 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1537R?
1537R is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-777-7189. This indicates validated use in U.S. government and defense supply chains.
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