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942A4 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

942A4: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, bore_diameter: 0.6520 INCHES NOMINAL IN, overall_height: 0.6393 INCHES MINIMUM AND 0.6643 INCHES MAXIMUM IN, style_designator: SEAT, bore_taper_in_deg: 15.0. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-301-3984, 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
942A4
NSN: 5340-00-301-3984
FSC: 5340 — Hardware, Commercial
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
bore_diameter0.6520 INCHES NOMINAL IN
overall_height0.6393 INCHES MINIMUM AND 0.6643 INCHES MAXIMUM IN
style_designatorSEAT
bore_taper_in_deg15.0
features_providedCASEHARDENED
first_step_length0.0800 INCHES MINIMUM AND 0.0900 INCHES MAXIMUM IN
seat_angle_in_deg60.0
counterbore_length0.0625 INCHES NOMINAL IN
first_step_diameter1.3100 INCHES MINIMUM AND 1.3200 INCHES MAXIMUM IN
second_end_diameter1.5000 INCHES NOMINAL IN
NSN5340-00-301-3984
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 942A4 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
•
COUNTERSINK ANGLE IN DEG: 45.0
•
FIRST STEP DIAMETER: 1.3100 INCHES MINIMUM AND 1.3200 INCHES MAXIMUM IN
•
MATERIAL HARDNESS RATING: 85.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 87.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM
•
SEAT ANGLE IN DEG: 60.0
•
SECOND END DIAMETER: 1.5000 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.4568 INCHES MINIMUM AND 0.4668 INCHES MAXIMUM IN
•
DESIGN TYPE: SOLID
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.6393 INCHES MINIMUM AND 0.6643 INCHES MAXIMUM IN
COUNTERSINK ANGLE IN DEG45.0
FIRST STEP DIAMETER1.3100 INCHES MINIMUM AND 1.3200 INCHES MAXIMUM IN
MATERIAL HARDNESS RATING85.5 ROCKWELL SUPERFICIAL 15-N MINIMUM AND 87.5 ROCKWELL SUPERFICIAL 15-N MAXIMUM
SEAT ANGLE IN DEG60.0
SECOND END DIAMETER1.5000 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.4568 INCHES MINIMUM AND 0.4668 INCHES MAXIMUM IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
COUNTERBORE LENGTH0.0625 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
913570Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 942A4?
942A4 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 942A4?
There is 1 known substitute for 942A4: 913570. Substitute compatibility should be verified for your specific system.
What is the NSN for 942A4?
942A4 is cataloged in the U.S. Government catalog under NSN 5340-00-301-3984. 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.