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Technical Data Sheet
PartsTable / COMPONENT / 3257-00
3257-00 ✓ 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 PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, first_end_style: ROUND, second_end_style: SQUARE, pin_overall_length: 0.375 INCHES NOMINAL IN, pin_overall_diameter: 0.1870 INCHES NOMINAL IN, first_end_outer_radius: 0.062 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 5315-00-141-6503, 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
3257-00
NSN: 5315-00-141-6503
FSC: 5315
CAGE: 53655 — AVOX SYSTEMS INC DBA AVOX SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
first_end_styleROUND
second_end_styleSQUARE
pin_overall_length0.375 INCHES NOMINAL IN
pin_overall_diameter0.1870 INCHES NOMINAL IN
first_end_outer_radius0.062 INCHES NOMINAL IN
second_end_relationship_with_first_endNOT IDENTICAL
NSN5315-00-141-6503
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3257-00 · 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
•
FIRST END OUTER RADIUS: 0.062 INCHES NOMINAL IN
•
PIN OVERALL DIAMETER: 0.1870 INCHES NOMINAL IN
•
PIN OVERALL LENGTH: 0.375 INCHES NOMINAL IN
•
SECOND END STYLE: SQUARE
•
SECOND END RELATIONSHIP WITH FIRST END: NOT IDENTICAL
•
MATERIAL: STEEL OVERALL
•
FIRST END STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END OUTER RADIUS0.062 INCHES NOMINAL IN
PIN OVERALL DIAMETER0.1870 INCHES NOMINAL IN
PIN OVERALL LENGTH0.375 INCHES NOMINAL IN
SECOND END STYLESQUARE
SECOND END RELATIONSHIP WITH FIRST ENDNOT IDENTICAL
MATERIALSTEEL OVERALL
FIRST END STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
USAF325-7Interchangeable
interchangeable cross-reference
interchangeable
325-7Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA2Interchangeable
interchangeable cross-reference
interchangeable
172-377Interchangeable
interchangeable cross-reference
interchangeable
FD28851Interchangeable
interchangeable cross-reference
interchangeable
055552-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3257-00?
3257-00 is a PIN,STRAIGHT,HEADLESS.
What parts can replace 3257-00?
There are 11 known substitutes for 3257-00: USAF325-7, 325-7, FFB571TYPEA2 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3257-00?
3257-00 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-141-6503. 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