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637769 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
Legrand · ORING SEAL
PRODUCT OVERVIEW

637769: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL COMP 410, design_type: SOLID, end_diameter: 0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN, bore_diameter: 0.2510 INCHES MINIMUM AND 0.2530 INCHES MAXIMUM IN, overall_height: 0.3500 INCHES MINIMUM AND 0.3600 INCHES MAXIMUM IN, style_designator: SEAT. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-471-0766, 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
637769
NSN: 5340-00-471-0766
FSC: 5340 — Hardware, Commercial
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 410
design_typeSOLID
end_diameter0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN
bore_diameter0.2510 INCHES MINIMUM AND 0.2530 INCHES MAXIMUM IN
overall_height0.3500 INCHES MINIMUM AND 0.3600 INCHES MAXIMUM IN
style_designatorSEAT
first_step_length0.1880 INCHES MINIMUM AND 0.2080 INCHES MAXIMUM IN
counterbore_length0.1920 INCHES MINIMUM AND 0.1980 INCHES MAXIMUM IN
first_step_diameter0.9750 INCHES MINIMUM AND 0.9850 INCHES MAXIMUM IN
counterbore_diameter0.8000 INCHES MINIMUM AND 0.8200 INCHES MAXIMUM IN
second_step_diameter1.1800 INCHES MINIMUM AND 1.2000 INCHES MAXIMUM IN
material_hardness_rating25.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
NSN5340-00-471-0766
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 637769 MFR: Legrand ⚠ 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: 0.9750 INCHES MINIMUM AND 0.9850 INCHES MAXIMUM IN
•
MATERIAL HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
•
END DIAMETER: 0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN
•
DISTANCE FROM END TO FIRST STEP: 0.0780 INCHES MINIMUM AND 0.1020 INCHES MAXIMUM IN
•
DESIGN TYPE: SOLID
•
STYLE DESIGNATOR: SEAT
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5613 ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.3500 INCHES MINIMUM AND 0.3600 INCHES MAXIMUM IN
FIRST STEP DIAMETER0.9750 INCHES MINIMUM AND 0.9850 INCHES MAXIMUM IN
MATERIAL HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM
END DIAMETER0.3700 INCHES MINIMUM AND 0.3800 INCHES MAXIMUM IN
DISTANCE FROM END TO FIRST STEP0.0780 INCHES MINIMUM AND 0.1020 INCHES MAXIMUM IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5613 ASSN STD SINGLE MATERIAL RESPONSE
COUNTERBORE LENGTH0.1920 INCHES MINIMUM AND 0.1980 INCHES MAXIMUM IN
SECOND STEP DIAMETER1.1800 INCHES MINIMUM AND 1.2000 INCHES MAXIMUM IN
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 637769?
637769 is a SEAT,HELICAL COMPRESSION SPRING manufactured by Legrand.
What is the NSN for 637769?
637769 is cataloged in the U.S. Government catalog under NSN 5340-00-471-0766. 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.