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98438A031 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

98438A031: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OVERALL, hole_diameter: 0.398 INCHES MAXIMUM IN, outside_diameter: 0.694 INCHES MAXIMUM IN, style_designator: FLAT EXTERNAL TEETH, surface_treatment: PASSIVATE OVERALL, material_thickness: 0.032 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-261-6678, 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
98438A031
NSN: 5310-01-261-6678
FSC: 5310 — Nuts and Washers
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
hole_diameter0.398 INCHES MAXIMUM IN
outside_diameter0.694 INCHES MAXIMUM IN
style_designatorFLAT EXTERNAL TEETH
surface_treatmentPASSIVATE OVERALL
material_thickness0.032 INCHES NOMINAL IN
NSN5310-01-261-6678
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 98438A031 · 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: 0.694 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.032 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 410 OVERALL
•
HOLE DIAMETER: 0.398 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT EXTERNAL TEETH
OUTSIDE DIAMETER0.694 INCHES MAXIMUM IN
MATERIAL THICKNESS0.032 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 410 OVERALL
HOLE DIAMETER0.398 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
5310PL1630593Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is 98438A031?
98438A031 is a WASHER,LOCK.
What parts can replace 98438A031?
There is 1 known substitute for 98438A031: 5310PL1630593. Substitute compatibility should be verified for your specific system.
What is the NSN for 98438A031?
98438A031 is cataloged in the U.S. Government catalog under NSN 5310-01-261-6678. 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.