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548538 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

548538: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL COMP 4340, design_type: SOLID, end_diameter: 0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, bore_diameter: 0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN, overall_height: 0.3100 INCHES NOMINAL IN, special_features: NOT CASEHARDENED; ONE HOLE 0.062 IN. DIA THRU 2ND COUNTERBORE IN.

This part is cataloged in the U.S. Government catalog under NSN 5340-00-717-8325, 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
548538
NSN: 5340-00-717-8325
FSC: 5340 — Hardware, Commercial
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 4340
design_typeSOLID
end_diameter0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
bore_diameter0.0600 INCHES MINIMUM AND 0.0650 INCHES MAXIMUM IN
overall_height0.3100 INCHES NOMINAL IN
special_featuresNOT CASEHARDENED; ONE HOLE 0.062 IN. DIA THRU 2ND COUNTERBORE IN
style_designatorSEAT
first_step_length0.2550 INCHES MINIMUM AND 0.2650 INCHES MAXIMUM IN
counterbore_length0.1400 INCHES NOMINAL IN
first_step_diameter0.4310 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN
counterbore_diameter0.1340 INCHES MINIMUM AND 0.1440 INCHES MAXIMUM IN
supplementary_featuresDEEP LOOK PROJECT
NSN5340-00-717-8325
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 548538 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: 0.4310 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN
•
MATERIAL HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
•
END DIAMETER: 0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
•
DISTANCE FROM END TO FIRST STEP: 0.0400 INCHES MINIMUM AND 0.0450 INCHES MAXIMUM IN
•
DESIGN TYPE: SOLID
•
SUPPLEMENTARY FEATURES: DEEP LOOK PROJECT
•
CRITICALITY CODE JUSTIFICATION: SUPP
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.3100 INCHES NOMINAL IN
FIRST STEP DIAMETER0.4310 INCHES MINIMUM AND 0.4350 INCHES MAXIMUM IN
MATERIAL HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
END DIAMETER0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
DISTANCE FROM END TO FIRST STEP0.0400 INCHES MINIMUM AND 0.0450 INCHES MAXIMUM IN
DESIGN TYPESOLID
SUPPLEMENTARY FEATURESDEEP LOOK PROJECT
CRITICALITY CODE JUSTIFICATIONSUPP
STYLE DESIGNATORSEAT
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6415 ASSN STD SINGLE MATERIAL RESPONSE
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 548538?
548538 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 548538?
548538 is cataloged in the U.S. Government catalog under NSN 5340-00-717-8325. 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.