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F57691 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

F57691: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.250 INCHES NOMINAL IN, outside_diameter: 0.452 INCHES MINIMUM AND 0.484 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM AND CHROMATE OVERALL, material_thickness: 0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-403-7654, 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
F57691
NSN: 5310-00-403-7654
FSC: 5310 — Nuts and Washers
CAGE: 96344 — CODALEX LTD (CAN)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.250 INCHES NOMINAL IN
outside_diameter0.452 INCHES MINIMUM AND 0.484 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
external_key_quantity1
internal_key_quantity1
external_prebent_key_width0.110 INCHES NOMINAL IN
external_prebent_key_length0.050 INCHES NOMINAL IN
internal_straight_key_width0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
overall_distance_including_keys0.476 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
NSN5310-00-403-7654
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: F57691 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.149 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTERNAL PREBENT KEY LENGTH: 0.050 INCHES NOMINAL IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.476 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 0.452 INCHES MINIMUM AND 0.484 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.149 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTERNAL PREBENT KEY LENGTH0.050 INCHES NOMINAL IN
OVERALL DISTANCE INCLUDING KEYS0.476 INCHES MINIMUM AND 0.492 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER0.452 INCHES MINIMUM AND 0.484 INCHES MAXIMUM IN
MATERIAL THICKNESS0.037 INCHES MINIMUM AND 0.043 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY1
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
WR1-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is F57691?
F57691 is a WASHER,KEY.
What parts can replace F57691?
There is 1 known substitute for F57691: WR1-12. Substitute compatibility should be verified for your specific system.
What is the NSN for F57691?
F57691 is cataloged in the U.S. Government catalog under NSN 5310-00-403-7654. This indicates validated use in U.S. government and defense supply chains.
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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.