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32-21137-51 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

32-21137-51: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include length: 3.000 INCHES NOMINAL IN, material: STEEL COMP 321 OVERALL, thickness: 0.050 INCHES NOMINAL IN, hole_diameter: 0.050 INCHES NOMINAL IN, heat_treatment: AS FABRICATED, surface_treatment: SILVER OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-421-6667, 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
32-21137-51
NSN: 5310-00-421-6667
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
length3.000 INCHES NOMINAL IN
materialSTEEL COMP 321 OVERALL
thickness0.050 INCHES NOMINAL IN
hole_diameter0.050 INCHES NOMINAL IN
heat_treatmentAS FABRICATED
surface_treatmentSILVER OVERALL
width_across_flats3.000 INCHES NOMINAL IN
peripheral_shape_styleRECTANGULAR
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationMIL-S-6721 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-421-6667
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 32-21137-51 · 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
•
WIDTH ACROSS FLATS: 3.000 INCHES NOMINAL IN
•
LENGTH: 3.000 INCHES NOMINAL IN
•
HEAT TREATMENT: AS FABRICATED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6721 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: SILVER OVERALL
•
PERIPHERAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: STEEL COMP 321 OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS3.000 INCHES NOMINAL IN
LENGTH3.000 INCHES NOMINAL IN
HEAT TREATMENTAS FABRICATED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6721 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTSILVER OVERALL
PERIPHERAL SHAPE STYLERECTANGULAR
MATERIALSTEEL COMP 321 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.050 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 32-21137-51?
32-21137-51 is a WASHER,FLAT.
What is the NSN for 32-21137-51?
32-21137-51 is cataloged in the U.S. Government catalog under NSN 5310-00-421-6667. 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.