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PartsTable / COMPONENT / NAFB5643A
NAFB5643A ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.53125 INCHES NOMINAL IN, special_features: PERIPHERAL SHAPE-SQUARE,1.250 IN. ACROSS FLATS IN, material_thickness: 0.062 INCHES NOMINAL IN, external_keyway_width: 0.370 INCHES NOMINAL IN, external_keyway_length: 0.184 INCHES NOMINAL IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-470-1959, 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
NAFB5643A
NSN: 5310-00-470-1959
FSC: 5310
CAGE: 82796 — COLTEC INDUSTRIES INC. DBA FAIRBANKS MORSE ENGINE DIV FAIRBANKS MORSE ENGINE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.53125 INCHES NOMINAL IN
special_featuresPERIPHERAL SHAPE-SQUARE,1.250 IN. ACROSS FLATS IN
material_thickness0.062 INCHES NOMINAL IN
external_keyway_width0.370 INCHES NOMINAL IN
external_keyway_length0.184 INCHES NOMINAL IN
external_keyway_quantity4
material_document_and_classificationMIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-470-1959
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NAFB5643A · 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
•
EXTERNAL KEYWAY WIDTH: 0.370 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.062 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
EXTERNAL KEYWAY LENGTH: 0.184 INCHES NOMINAL IN
•
EXTERNAL KEYWAY QUANTITY: 4
•
HOLE DIAMETER: 0.53125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
EXTERNAL KEYWAY WIDTH0.370 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-16782 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.062 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
EXTERNAL KEYWAY LENGTH0.184 INCHES NOMINAL IN
EXTERNAL KEYWAY QUANTITY4
SPECIAL FEATURESPERIPHERAL SHAPE-SQUARE,1.250 IN. ACROSS FLATS IN
HOLE DIAMETER0.53125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
562265-14Interchangeable
interchangeable cross-reference
interchangeable
457-6012Interchangeable
interchangeable cross-reference
interchangeable
322-1107P3Interchangeable
interchangeable cross-reference
interchangeable
4178600-179Interchangeable
interchangeable cross-reference
interchangeable
451634-3Interchangeable
interchangeable cross-reference
interchangeable
S2030Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAFB5643A?
NAFB5643A is a WASHER,KEYWAY.
What parts can replace NAFB5643A?
There are 8 known substitutes for NAFB5643A: 562265-14, 457-6012, 322-1107P3 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NAFB5643A?
NAFB5643A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-470-1959. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026