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1902988 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1902988: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1010 OVERALL, thickness: 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN, hole_diameter: 0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN, overall_diameter: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, surface_treatment: ZINC OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-281-5021, 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
1902988
NSN: 5310-00-281-5021
FSC: 5310 — Nuts and Washers
CAGE: 61928 — GENERAL MOTORS CORP AC-DELCO DIV GOVERNMENT ORDER DEPT (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
thickness0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
hole_diameter0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
overall_diameter0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
surface_treatmentZINC OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-281-5021
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1902988 · 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
•
OVERALL DIAMETER: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: ZINC OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 1010 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTZINC OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 1010 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
THICKNESS0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 6
225803Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
1907036Reference document
Same NSN cross-reference
Reference document — Secondary reference
5310002815021Reference document
Same NSN cross-reference
Reference document — Informative reference only
A063947Reference document
Same NSN cross-reference
Reference document — Secondary reference
834231Reference document
Same NSN cross-reference
Reference document — Secondary reference
361917Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1902988?
1902988 is a WASHER,FLAT.
What parts can replace 1902988?
There are 6 known substitutes for 1902988: 225803, 1907036, 5310002815021 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1902988?
1902988 is cataloged in the U.S. Government catalog under NSN 5310-00-281-5021. 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.