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Technical Data Sheet
PartsTable / COMPONENT / 65-561-3
65-561-3 ✓ 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 65-561-3 is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, nut_style: EXTERNAL TOOTH, nut_height: 0.156 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), overall_height: 0.176 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-052-3632, 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
65-561-3
NSN: 5310-00-052-3632
FSC: 5310
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
nut_styleEXTERNAL TOOTH
nut_height0.156 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_height0.176 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.344 INCHES NOMINAL IN
nominal_thread_size0.164 INCHES IN
washer_outside_diameter0.375 INCHES NOMINAL IN
thread_quantity_per_inch32
NSN5310-00-052-3632
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 65-561-3 · 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
•
WASHER OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 32
•
NOMINAL THREAD SIZE: 0.164 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL COMP 1020 OVERALL
•
NUT HEIGHT: 0.156 INCHES NOMINAL IN
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
WASHER OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
THREAD QUANTITY PER INCH32
NOMINAL THREAD SIZE0.164 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL COMP 1020 OVERALL
NUT HEIGHT0.156 INCHES NOMINAL IN
THREAD CLASS2B
OVERALL HEIGHT0.176 INCHES NOMINAL IN
NUT STYLEEXTERNAL TOOTH
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
511-081800-00Interchangeable
interchangeable cross-reference
interchangeable
5310PL0995638Interchangeable
interchangeable cross-reference
interchangeable
210-0458-00Interchangeable
interchangeable cross-reference
interchangeable
9226Interchangeable
interchangeable cross-reference
interchangeable
141284Interchangeable
interchangeable cross-reference
interchangeable
51363-R PC7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 65-561-3?
65-561-3 is a 65-561-3.
What parts can replace 65-561-3?
There are 25 known substitutes for 65-561-3: 511-081800-00, 5310PL0995638, 210-0458-00 and 22 more. Substitute compatibility should be verified for your specific system.
Is 65-561-3 still available?
65-561-3 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