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196M4 ✓ 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

NUT,PLAIN,SINGLE BALL SEAT,HEXAG. Key specifications include material: STEEL OVERALL, nut_style: SINGLE BALL SEAT, HEXAGON, nut_height: 0.812 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, ball_seat_radius: 0.625 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 5310-00-264-0542, 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
196M4
NSN: 5310-00-264-0542
FSC: 5310
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSINGLE BALL SEAT, HEXAGON
nut_height0.812 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
ball_seat_radius0.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats1.250 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
thread_quantity_per_inch18
NSN5310-00-264-0542
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 196M4 · 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
•
NUT STYLE: SINGLE BALL SEAT, HEXAGON
•
THREAD CLASS: 2B
•
THREAD SERIES: UNF
•
NOMINAL THREAD SIZE: 0.625 INCHES IN
•
THREAD QUANTITY PER INCH: 18
•
MATERIAL: STEEL OVERALL
•
BALL SEAT RADIUS: 0.625 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLESINGLE BALL SEAT, HEXAGON
THREAD CLASS2B
THREAD SERIESUNF
NOMINAL THREAD SIZE0.625 INCHES IN
THREAD QUANTITY PER INCH18
MATERIALSTEEL OVERALL
BALL SEAT RADIUS0.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS1.250 INCHES NOMINAL IN
NUT HEIGHT0.812 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
A539FS160Interchangeable
interchangeable cross-reference
interchangeable
A539Interchangeable
interchangeable cross-reference
interchangeable
GGG-A-821Interchangeable
interchangeable cross-reference
interchangeable
C539Interchangeable
interchangeable cross-reference
interchangeable
15-03409-00Interchangeable
interchangeable cross-reference
interchangeable
153409Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 196M4?
196M4 is a NUT,PLAIN,SINGLE BALL SEAT,HEXAG.
What parts can replace 196M4?
There are 27 known substitutes for 196M4: A539FS160, A539, GGG-A-821 and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 196M4?
196M4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-264-0542. 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