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SP19921 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

SP19921: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC OVERALL, thickness: 0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN, hole_diameter: 0.558 INCHES MINIMUM AND 0.568 INCHES MAXIMUM IN, hardness_rating: 75.0 BRINELL STANDARD MINIMUM AND 85.0 BRINELL STANDARD MAXIMUM, overall_diameter: 0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM IN, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-285-9637, 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
SP19921
NSN: 5310-00-285-9637
FSC: 5310 — Nuts and Washers
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC OVERALL
thickness0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
hole_diameter0.558 INCHES MINIMUM AND 0.568 INCHES MAXIMUM IN
hardness_rating75.0 BRINELL STANDARD MINIMUM AND 85.0 BRINELL STANDARD MAXIMUM
overall_diameter0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
minimum_tensile_strength1950 POUNDS PER SQUARE INCH LBS
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-R-3533,TY 1,GR A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-285-9637
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SP19921 · 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: 0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM IN
•
HARDNESS RATING: 75.0 BRINELL STANDARD MINIMUM AND 85.0 BRINELL STANDARD MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-3533,TY 1,GR A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MINIMUM TENSILE STRENGTH: 1950 POUNDS PER SQUARE INCH LBS
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: RUBBER SYNTHETIC OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.896 INCHES MINIMUM AND 0.916 INCHES MAXIMUM IN
HARDNESS RATING75.0 BRINELL STANDARD MINIMUM AND 85.0 BRINELL STANDARD MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-3533,TY 1,GR A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MINIMUM TENSILE STRENGTH1950 POUNDS PER SQUARE INCH LBS
PERIPHERAL SHAPE STYLEROUND
MATERIALRUBBER SYNTHETIC OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.558 INCHES MINIMUM AND 0.568 INCHES MAXIMUM IN
THICKNESS0.053 INCHES MINIMUM AND 0.073 INCHES MAXIMUM 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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SP19921?
SP19921 is a WASHER,FLAT.
What is the NSN for SP19921?
SP19921 is cataloged in the U.S. Government catalog under NSN 5310-00-285-9637. 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.