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PartsTable / COMPONENT / 57C4
57C4 ✓ 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,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: ROUND, nut_diameter: 2.062 INCHES NOMINAL IN, nut_thickness: 0.438 INCHES NOMINAL IN, thread_series: UNEF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-637-8939, 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
57C4
NSN: 5310-00-637-8939
FSC: 5310
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleROUND
nut_diameter2.062 INCHES NOMINAL IN
nut_thickness0.438 INCHES NOMINAL IN
thread_seriesUNEF
thread_directionRIGHT-HAND
drive_point_depth0.094 INCHES NOMINAL IN
drive_point_width0.188 INCHES NOMINAL IN
nominal_thread_size1.375 INCHES IN
drive_point_quantity4
thread_pitch_diameters+1.3399 TO 1.3439 INCHES IN
thread_quantity_per_inch18
NSN5310-00-637-8939
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 57C4 · 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
•
DRIVE POINT QUANTITY: 4
•
THREAD PITCH DIAMETERS: +1.3399 TO 1.3439 INCHES IN
•
THREAD SERIES: UNEF
•
THREAD QUANTITY PER INCH: 18
•
NOMINAL THREAD SIZE: 1.375 INCHES IN
•
NUT THICKNESS: 0.438 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
DRIVE POINT WIDTH: 0.188 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DRIVE POINT QUANTITY4
THREAD PITCH DIAMETERS+1.3399 TO 1.3439 INCHES IN
THREAD SERIESUNEF
THREAD QUANTITY PER INCH18
NOMINAL THREAD SIZE1.375 INCHES IN
NUT THICKNESS0.438 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
DRIVE POINT WIDTH0.188 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
NUT DIAMETER2.062 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
81523Interchangeable
interchangeable cross-reference
interchangeable
ZZ90060Interchangeable
interchangeable cross-reference
interchangeable
1F4Interchangeable
interchangeable cross-reference
interchangeable
9FCS6Interchangeable
interchangeable cross-reference
interchangeable
1892-4Interchangeable
interchangeable cross-reference
interchangeable
1891PC4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 57C4?
57C4 is a NUT,PLAIN,ROUND.
What parts can replace 57C4?
There are 18 known substitutes for 57C4: 81523, ZZ90060, 1F4 and 15 more. Substitute compatibility should be verified for your specific system.
Is 57C4 still available?
57C4 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