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98438A240 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

98438A240: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OVERALL, hole_diameter: 0.256 INCHES NOMINAL IN, outside_diameter: 0.510 INCHES NOMINAL IN, special_features: 410 STAINLESS STEEL EXTERNAL TOOTH LOCK WASHER 1/4 INCH SCREW SIZ, .256INCH ID, .520 INCH OD, .023 MIN THICK IN, style_designator: FLAT EXTERNAL TEETH, material_thickness: 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-529-4835, 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
98438A240
NSN: 5310-01-529-4835
FSC: 5310 — Nuts and Washers
CAGE: 2V507 — MCMASTER-CARR SUPPLY COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
hole_diameter0.256 INCHES NOMINAL IN
outside_diameter0.510 INCHES NOMINAL IN
special_features410 STAINLESS STEEL EXTERNAL TOOTH LOCK WASHER 1/4 INCH SCREW SIZ, .256INCH ID, .520 INCH OD, .023 MIN THICK IN
style_designatorFLAT EXTERNAL TEETH
material_thickness0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
end_item_identification5820-01-491-0215
NSN5310-01-529-4835
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 98438A240 · 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: 0.510 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 410 OVERALL
•
HOLE DIAMETER: 0.256 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT EXTERNAL TEETH
OUTSIDE DIAMETER0.510 INCHES NOMINAL IN
MATERIAL THICKNESS0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
SPECIAL FEATURES410 STAINLESS STEEL EXTERNAL TOOTH LOCK WASHER 1/4 INCH SCREW SIZ, .256INCH ID, .520 INCH OD, .023 MIN THICK IN
END ITEM IDENTIFICATION5820-01-491-0215
MATERIALSTEEL COMP 410 OVERALL
HOLE DIAMETER0.256 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
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 98438A240?
98438A240 is a WASHER,LOCK.
What is the NSN for 98438A240?
98438A240 is cataloged in the U.S. Government catalog under NSN 5310-01-529-4835. 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.