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K250865 ✓ 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 COMP 4615 OVERALL, hole_diameter: 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, outside_diameter: 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN, material_thickness: 0.131 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN, internal_keyway_width: 0.063 INCHES MINIMUM AND 0.066 INCHES MAXIMUM 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 5310-00-406-2594, 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
K250865
NSN: 5310-00-406-2594
FSC: 5310
CAGE: 5RQL2 — DRS ENVIRONMENTAL SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4615 OVERALL
hole_diameter0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
outside_diameter0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
material_thickness0.131 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
internal_keyway_width0.063 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
internal_keyway_quantity1
material_document_and_classificationASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_bottom_of_internal_keyway0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
NSN5310-00-406-2594
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K250865 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 4615 OVERALL
•
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY: 0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
•
INTERNAL KEYWAY WIDTH: 0.063 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.131 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
INTERNAL KEYWAY QUANTITY: 1
•
OUTSIDE DIAMETER: 0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 4615 OVERALL
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY0.215 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN
INTERNAL KEYWAY WIDTH0.063 INCHES MINIMUM AND 0.066 INCHES MAXIMUM IN
MATERIAL THICKNESS0.131 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
HOLE DIAMETER0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
INTERNAL KEYWAY QUANTITY1
OUTSIDE DIAMETER0.620 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
PPP-B-26Interchangeable
interchangeable cross-reference
interchangeable
A-A-3174 TYVInterchangeable
interchangeable cross-reference
interchangeable
191-3902Interchangeable
interchangeable cross-reference
interchangeable
250865Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K250865?
K250865 is a WASHER,KEYWAY.
What parts can replace K250865?
There are 4 known substitutes for K250865: PPP-B-26, A-A-3174 TYV, 191-3902 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K250865?
K250865 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-406-2594. 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