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PartsTable / COMPONENT / 68C1-40
68C1-40 ✓ 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 NUT,SELF-LOCKING,SPLINE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY NUT, nut_height: 0.205 INCHES NOMINAL IN, pilot_length: 0.063 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC), pilot_diameter: 0.189 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-297-9084, 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
68C1-40
NSN: 5310-00-297-9084
FSC: 5310
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY NUT
nut_height0.205 INCHES NOMINAL IN
pilot_length0.063 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.189 INCHES NOMINAL IN
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
surface_treatmentANODIZE NUT
nominal_thread_size0.112 INCHES IN
thread_quantity_per_inch40
NSN5310-00-297-9084
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 68C1-40 · 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
•
THREAD CLASS: 3B
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.112 INCHES IN
•
THREAD QUANTITY PER INCH: 40
•
MATERIAL: ALUMINUM ALLOY NUT
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
PILOT LENGTH: 0.063 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3B
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.112 INCHES IN
THREAD QUANTITY PER INCH40
MATERIALALUMINUM ALLOY NUT
MATERIALFIBER LOCKING INSERT
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
PILOT LENGTH0.063 INCHES NOMINAL IN
SURFACE TREATMENTANODIZE NUT
PILOT DIAMETER0.189 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
79101Interchangeable
interchangeable cross-reference
interchangeable
AT-2206Interchangeable
interchangeable cross-reference
interchangeable
A7506Interchangeable
interchangeable cross-reference
interchangeable
722899-057Interchangeable
interchangeable cross-reference
interchangeable
4S90098-101AInterchangeable
interchangeable cross-reference
interchangeable
845031B4004Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 68C1-40?
68C1-40 is a NUT,SELF-LOCKING,SPLINE.
What parts can replace 68C1-40?
There are 8 known substitutes for 68C1-40: 79101, AT-2206, A7506 and 5 more. Substitute compatibility should be verified for your specific system.
Is 68C1-40 still available?
68C1-40 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