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PartsTable / COMPONENT / SMB148421
SMB148421 ✓ 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,GROOVED,HEADLESS is a the manufacturer industrial component. Key specifications include diameter: 0.123 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN, material: STEEL COMP 303 OVERALL, overall_length: 2.328 INCHES NOMINAL IN, undercut_width: 0.047 INCHES NOMINAL IN, first_end_style: CHAMFERED, effective_length: 2.109 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 5315-00-392-7757, 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
SMB148421
NSN: 5315-00-392-7757
FSC: 5315
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
diameter0.123 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
materialSTEEL COMP 303 OVERALL
overall_length2.328 INCHES NOMINAL IN
undercut_width0.047 INCHES NOMINAL IN
first_end_styleCHAMFERED
effective_length2.109 INCHES NOMINAL IN
style_designatorGROOVE
surface_treatmentPASSIVATE OVERALL
undercut_diameter0.093 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN
first_end_locationBOTH ENDS
first_end_taper_angle45.0 DEGREES NOMINAL
second_undercut_width0.047 INCHES NOMINAL IN
NSN5315-00-392-7757
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SMB148421 · 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 STYLE: CHAMFERED
•
FIRST END TAPER ANGLE: 45.0 DEGREES NOMINAL
•
SECOND UNDERCUT WIDTH: 0.047 INCHES NOMINAL IN
•
EFFECTIVE LENGTH: 2.109 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL COMP 303 OVERALL
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLECHAMFERED
FIRST END TAPER ANGLE45.0 DEGREES NOMINAL
SECOND UNDERCUT WIDTH0.047 INCHES NOMINAL IN
EFFECTIVE LENGTH2.109 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 303 OVERALL
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
OVERALL LENGTH2.328 INCHES NOMINAL IN
UNDERCUT DIAMETER0.093 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN
FIRST END TAPER LENGTH0.015 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
CSE405AInterchangeable
interchangeable cross-reference
interchangeable
55440Interchangeable
interchangeable cross-reference
interchangeable
1424 5/8Interchangeable
interchangeable cross-reference
interchangeable
52258Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB148421?
SMB148421 is a PIN,GROOVED,HEADLESS.
What parts can replace SMB148421?
There are 4 known substitutes for SMB148421: CSE405A, 55440, 1424 5/8 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SMB148421?
SMB148421 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-392-7757. 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