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4200251 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4200251: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, hole_diameter: 2.500 INCHES MINIMUM AND 2.500 INCHES MINIMUM AND 2.502 INCHES MAXIMUM2.502 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES BOTTOM32.0 MICROINCHES BOTTOM, outside_diameter: 2.938 INCHES NOMINAL2.938 INCHES NOMINAL IN, style_designator: KEYKEY, material_thickness: 0.120 INCHES MINIMUM AND 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-139-6545, 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
4200251
NSN: 5310-00-139-6545
NIINs: 001396545, 017009065
FSC: 5310 — Nuts and Washers
CAGE: 80020 — NAVAL AIR WARFARE CENTER AIRCRAFT DIVISION JOINT BASE JBMDL (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
hole_diameter2.500 INCHES MINIMUM AND 2.500 INCHES MINIMUM AND 2.502 INCHES MAXIMUM2.502 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES BOTTOM32.0 MICROINCHES BOTTOM
outside_diameter2.938 INCHES NOMINAL2.938 INCHES NOMINAL IN
style_designatorKEYKEY
material_thickness0.120 INCHES MINIMUM AND 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
internal_key_quantity11
internal_straight_key_width0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM0.290 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key0.099 INCHES MINIMUM AND 0.099 INCHES MINIMUM AND 0.108 INCHES MAXIMUM0.108 INCHES MAXIMUM IN
NSN5310-00-139-6545
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4200251 · 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
•
SURFACE FINISH: 32.0 MICROINCHES BOTTOM32.0 MICROINCHES BOTTOM
•
INTERNAL STRAIGHT KEY WIDTH: 0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM0.290 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.099 INCHES MINIMUM AND 0.099 INCHES MINIMUM AND 0.108 INCHES MAXIMUM0.108 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEYKEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.938 INCHES NOMINAL2.938 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.120 INCHES MINIMUM AND 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTTOM32.0 MICROINCHES BOTTOM
SURFACE FINISH32.0 MICROINCHES TOP32.0 MICROINCHES TOP
INTERNAL STRAIGHT KEY WIDTH0.280 INCHES MINIMUM AND 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM0.290 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.099 INCHES MINIMUM AND 0.099 INCHES MINIMUM AND 0.108 INCHES MAXIMUM0.108 INCHES MAXIMUM IN
STYLE DESIGNATORKEYKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.938 INCHES NOMINAL2.938 INCHES NOMINAL IN
MATERIAL THICKNESS0.120 INCHES MINIMUM AND 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM0.125 INCHES MAXIMUM IN
MATERIALSTEEL COMP 304 OVERALL
INTERNAL KEY QUANTITY11
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4200251?
4200251 is a WASHER,KEY.
What is the NSN for 4200251?
4200251 is cataloged in the U.S. Government catalog under NSN 5310-00-139-6545. 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.