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A51G20522-11 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A51G20522-11: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include material: ALUMINUM ALLOY, design_type: SOLID, end_diameter: 0.4800 INCHES MINIMUM AND 0.4850 INCHES MAXIMUM IN, bore_diameter: 0.4010 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN, overall_height: 0.6000 INCHES NOMINAL IN, special_features: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-781-3775, 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
A51G20522-11
NSN: 5340-00-781-3775
FSC: 5340 — Hardware, Commercial
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
design_typeSOLID
end_diameter0.4800 INCHES MINIMUM AND 0.4850 INCHES MAXIMUM IN
bore_diameter0.4010 INCHES MINIMUM AND 0.4020 INCHES MAXIMUM IN
overall_height0.6000 INCHES NOMINAL IN
special_featuresNOT CASEHARDENED
style_designatorSEAT
first_step_diameter0.8660 INCHES MINIMUM AND 0.8680 INCHES MAXIMUM IN
countersink_diameter0.4600 INCHES NOMINAL IN
fsc_application_dataSPRING ASSEMBLY,CENTERING,SIDE BRACE,MAIN LANDING GEAR,AIRCRAFT
countersink_angle_in_deg45.0
distance_from_end_to_first_step0.5200 INCHES NOMINAL IN
NSN5340-00-781-3775
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A51G20522-11 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
•
FSC APPLICATION DATA: SPRING ASSEMBLY,CENTERING,SIDE BRACE,MAIN LANDING GEAR,AIRCRAFT
•
FIRST STEP DIAMETER: 0.8660 INCHES MINIMUM AND 0.8680 INCHES MAXIMUM IN
•
END DIAMETER: 0.4800 INCHES MINIMUM AND 0.4850 INCHES MAXIMUM IN
•
COUNTERSINK DIAMETER: 0.4600 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST STEP: 0.5200 INCHES NOMINAL IN
•
DESIGN TYPE: SOLID
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.6000 INCHES NOMINAL IN
COUNTERSINK ANGLE IN DEG45.0
FSC APPLICATION DATASPRING ASSEMBLY,CENTERING,SIDE BRACE,MAIN LANDING GEAR,AIRCRAFT
FIRST STEP DIAMETER0.8660 INCHES MINIMUM AND 0.8680 INCHES MAXIMUM IN
END DIAMETER0.4800 INCHES MINIMUM AND 0.4850 INCHES MAXIMUM IN
COUNTERSINK DIAMETER0.4600 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST STEP0.5200 INCHES NOMINAL IN
DESIGN TYPESOLID
STYLE DESIGNATORSEAT
SPECIAL FEATURESNOT CASEHARDENED
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 A51G20522-11?
A51G20522-11 is a SEAT,HELICAL COMPRESSION SPRING.
What is the NSN for A51G20522-11?
A51G20522-11 is cataloged in the U.S. Government catalog under NSN 5340-00-781-3775. 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.