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A20496 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

A20496: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.195 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN, outside_diameter: 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN, style_designator: FLAT EXTERNAL TEETH, surface_treatment: ZINC AND PHOSPHATE OVERALL, material_thickness: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-949-1971, 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
A20496
NSN: 5310-00-949-1971
FSC: 5310 — Nuts and Washers
CAGE: U4574 — FNH UK LTD (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.195 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
outside_diameter0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
style_designatorFLAT EXTERNAL TEETH
surface_treatmentZINC AND PHOSPHATE OVERALL
material_thickness0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
NSN5310-00-949-1971
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A20496 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STYLE DESIGNATOR: FLAT EXTERNAL TEETH
•
OUTSIDE DIAMETER: 0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC AND PHOSPHATE OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.195 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT EXTERNAL TEETH
OUTSIDE DIAMETER0.395 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
MATERIAL THICKNESS0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
SURFACE TREATMENTZINC AND PHOSPHATE OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.195 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 5
5310PL0918872Reference document
Same NSN cross-reference
Reference document — Informative reference only
717124434409Reference document
Same NSN cross-reference
Reference document — Informative reference only
5310009491971Reference document
Same NSN cross-reference
Reference document — Informative reference only
A10752Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
11010413Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 A20496?
A20496 is a WASHER,LOCK.
What parts can replace A20496?
There are 5 known substitutes for A20496: 5310PL0918872, 717124434409, 5310009491971 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A20496?
A20496 is cataloged in the U.S. Government catalog under NSN 5310-00-949-1971. 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.