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R21019 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

R21019: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 932 OVERALL, thickness: 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN, hole_diameter: 1.812 INCHES NOMINAL IN, overall_diameter: 2.250 INCHES MINIMUM AND 2.251 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-737-1098, 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
R21019
NSN: 5310-00-737-1098
FSC: 5310 — Nuts and Washers
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 932 OVERALL
thickness0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
hole_diameter1.812 INCHES NOMINAL IN
overall_diameter2.250 INCHES MINIMUM AND 2.251 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-737-1098
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R21019 · 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: 2.250 INCHES MINIMUM AND 2.251 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY 932 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.812 INCHES NOMINAL IN
•
THICKNESS: 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER2.250 INCHES MINIMUM AND 2.251 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALCOPPER ALLOY 932 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.812 INCHES NOMINAL IN
THICKNESS0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 3
A780Reference document
Same NSN cross-reference
Reference document — Secondary reference
S953Reference document
Same NSN cross-reference
Reference document — Secondary reference
GP3374Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R21019?
R21019 is a WASHER,FLAT.
What parts can replace R21019?
There are 3 known substitutes for R21019: A780, S953, GP3374. Substitute compatibility should be verified for your specific system.
What is the NSN for R21019?
R21019 is cataloged in the U.S. Government catalog under NSN 5310-00-737-1098. 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.