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PartsTable / COMPONENT / 638040131
638040131 ✓ 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,KNURLED is a the manufacturer industrial component. Key specifications include diameter: 0.2966 INCHES MINIMUM AND 0.2968 INCHES MAXIMUM IN, material: STEEL COMP 630 OVERALL, knurl_length: 0.625 INCHES NOMINAL IN, overall_length: 1.250 INCHES NOMINAL IN, first_end_style: SQUARE, style_designator: DIAMOND KNURLED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-433-1006, 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
638040131
NSN: 5315-01-433-1006
FSC: 5315
CAGE: 57716 — WILSHIRE CORP (USA)
SPECIFICATIONS
diameter0.2966 INCHES MINIMUM AND 0.2968 INCHES MAXIMUM IN
materialSTEEL COMP 630 OVERALL
knurl_length0.625 INCHES NOMINAL IN
overall_length1.250 INCHES NOMINAL IN
first_end_styleSQUARE
style_designatorDIAMOND KNURLED
surface_treatmentPASSIVATE OVERALL
knurl_to_end_distance0.312 INCHES NOMINAL IN
knurl_outside_diameter0.305 INCHES MINIMUM AND 0.309 INCHES MAXIMUM IN
second_end_relationship_with_first_endIDENTICAL
NSN5315-01-433-1006
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 638040131 · 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
•
KNURL TO END DISTANCE: 0.312 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 630 OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
KNURL OUTSIDE DIAMETER: 0.305 INCHES MINIMUM AND 0.309 INCHES MAXIMUM IN
•
DIAMETER: 0.2966 INCHES MINIMUM AND 0.2968 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: DIAMOND KNURLED
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.250 INCHES NOMINAL IN
KNURL TO END DISTANCE0.312 INCHES NOMINAL IN
MATERIALSTEEL COMP 630 OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
KNURL OUTSIDE DIAMETER0.305 INCHES MINIMUM AND 0.309 INCHES MAXIMUM IN
DIAMETER0.2966 INCHES MINIMUM AND 0.2968 INCHES MAXIMUM IN
STYLE DESIGNATORDIAMOND KNURLED
FIRST END STYLESQUARE
KNURL LENGTH0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
T-1923Interchangeable
interchangeable cross-reference
interchangeable
9808-238Interchangeable
interchangeable cross-reference
interchangeable
40131Interchangeable
interchangeable cross-reference
interchangeable
40131-00Interchangeable
interchangeable cross-reference
interchangeable
C406Interchangeable
interchangeable cross-reference
interchangeable
BA3134Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 638040131?
638040131 is a PIN,STRAIGHT,KNURLED.
What parts can replace 638040131?
There are 8 known substitutes for 638040131: T-1923, 9808-238, 40131 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 638040131?
638040131 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-433-1006. 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