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Technical Data Sheet
PartsTable / COMPONENT / 987021000RA1000
987021000RA1000 ✓ 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: 0.5000 INCHES NOMINAL IN, bore_diameter: 0.3270 INCHES NOMINAL IN, overall_height: 0.2370 INCHES NOMINAL IN, special_features: NOT CASEHARDENED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-003-6618, 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
987021000RA1000
NSN: 5340-01-003-6618
FSC: 5340
CAGE: 30458 — J R S INDUSTRIES INC (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.5000 INCHES NOMINAL IN
bore_diameter0.3270 INCHES NOMINAL IN
overall_height0.2370 INCHES NOMINAL IN
special_featuresNOT CASEHARDENED
style_designatorSEAT
first_step_length0.0620 INCHES NOMINAL IN
counterbore_length0.2000 INCHES NOMINAL IN
first_step_diameter0.6450 INCHES NOMINAL IN
chamfer_angle_in_deg30.0
counterbore_diameter0.4050 INCHES NOMINAL IN
NSN5340-01-003-6618
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 987021000RA1000 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
•
DISTANCE FROM END TO FIRST STEP: 0.2000 INCHES NOMINAL IN
•
COUNTERBORE LENGTH: 0.2000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SEAT
•
DESIGN TYPE: SOLID
•
END DIAMETER: 0.5000 INCHES NOMINAL IN
•
COUNTERSINK DIAMETER: 0.0930 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESNOT CASEHARDENED
DISTANCE FROM END TO FIRST STEP0.2000 INCHES NOMINAL IN
COUNTERBORE LENGTH0.2000 INCHES NOMINAL IN
STYLE DESIGNATORSEAT
DESIGN TYPESOLID
END DIAMETER0.5000 INCHES NOMINAL IN
COUNTERSINK DIAMETER0.0930 INCHES NOMINAL IN
MATERIALSTEEL
BORE DIAMETER0.3270 INCHES NOMINAL IN
SECOND STEP DIAMETER0.8500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
6515NCM020691Upgraded Successor
successor cross-reference
successor
02-1142Upgraded Successor
successor cross-reference
successor
400.144Upgraded Successor
successor cross-reference
successor
9436055Interchangeable
interchangeable cross-reference
interchangeable
10162179-1Interchangeable
interchangeable cross-reference
interchangeable
25253Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 987021000RA1000?
987021000RA1000 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 987021000RA1000?
There are 19 known substitutes for 987021000RA1000: 6515NCM020691, 02-1142, 400.144 and 16 more. Substitute compatibility should be verified for your specific system.
Is 987021000RA1000 still available?
987021000RA1000 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