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6N8629 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6N8629: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: STEEL, design_type: SOLID, end_diameter: 0.6840 INCHES NOMINAL IN, bore_diameter: 0.3120 INCHES NOMINAL IN, overall_height: 1.3750 INCHES NOMINAL IN, special_features: 0.138 IN. DIA HOLE THRU SEAT OBDY 1.062 IN.

FROM END IN. This part is cataloged in the U.S. Government catalog under NSN 5340-01-071-2545, 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
6N8629
NSN: 5340-01-071-2545
FSC: 5340 — Hardware, Commercial
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL
design_typeSOLID
end_diameter0.6840 INCHES NOMINAL IN
bore_diameter0.3120 INCHES NOMINAL IN
overall_height1.3750 INCHES NOMINAL IN
special_features0.138 IN. DIA HOLE THRU SEAT OBDY 1.062 IN. FROM END IN
first_step_length0.1790 INCHES NOMINAL IN
counterbore_length1.1250 INCHES NOMINAL IN
first_step_diameter1.1560 INCHES NOMINAL IN
counterbore_diameter0.4230 INCHES NOMINAL IN
second_step_diameter1.3640 INCHES NOMINAL IN
second_counterbore_length0.5000 INCHES NOMINAL IN
NSN5340-01-071-2545
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6N8629 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: 1.1560 INCHES NOMINAL IN
•
END DIAMETER: 0.6840 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 1.1400 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
•
COUNTERBORE LENGTH: 1.1250 INCHES NOMINAL IN
•
SECOND STEP DIAMETER: 1.3640 INCHES NOMINAL IN
•
COUNTERBORE DIAMETER: 0.4230 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.3750 INCHES NOMINAL IN
FIRST STEP DIAMETER1.1560 INCHES NOMINAL IN
END DIAMETER0.6840 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP1.1400 INCHES NOMINAL IN
DESIGN TYPESOLID
COUNTERBORE LENGTH1.1250 INCHES NOMINAL IN
SECOND STEP DIAMETER1.3640 INCHES NOMINAL IN
COUNTERBORE DIAMETER0.4230 INCHES NOMINAL IN
SECOND COUNTERBORE LENGTH0.5000 INCHES NOMINAL IN
FIRST STEP LENGTH0.1790 INCHES NOMINAL 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6N8629?
6N8629 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for 6N8629?
6N8629 is cataloged in the U.S. Government catalog under NSN 5340-01-071-2545. 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.