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Technical Data Sheet
PartsTable / COMPONENT / 256NKS-(0.040)
256NKS-(0.040) ✓ 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 256NKS-(0.040) is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-820-8966, 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
256NKS-(0.040)
NSN: 5310-00-820-8966
FSC: 5310
CAGE: 86577 — PRECISION METAL PRODUCTS CO (USA)
SPECIFICATIONS
Part Number256NKS-(0.040)
NSN5310-00-820-8966
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 256NKS-(0.040) · 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: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
NUT DIAMETER: 0.250 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 56
•
NOMINAL THREAD SIZE: 0.086 INCHES IN
•
PILOT LENGTH: 0.038 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
NUT DIAMETER0.250 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH56
NOMINAL THREAD SIZE0.086 INCHES IN
PILOT LENGTH0.038 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.100 INCHES NOMINAL IN
MATERIALSTEEL COMP 303 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
CS13AC101KInterchangeable
interchangeable cross-reference
interchangeable
808142Interchangeable
interchangeable cross-reference
interchangeable
5910PL0900239Interchangeable
interchangeable cross-reference
interchangeable
512951Interchangeable
interchangeable cross-reference
interchangeable
808179Interchangeable
interchangeable cross-reference
interchangeable
40910742Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 256NKS-(0.040)?
256NKS-(0.040) is a 256NKS-(0.040).
What parts can replace 256NKS-(0.040)?
There are 18 known substitutes for 256NKS-(0.040): CS13AC101K, 808142, 5910PL0900239 and 15 more. Substitute compatibility should be verified for your specific system.
Is 256NKS-(0.040) still available?
256NKS-(0.040) is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026