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PartsTable / COMPONENT / SMB157538
SMB157538 ✓ 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,KNURLED is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: KNURLED, nut_diameter: 0.500 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.625 INCHES NOMINAL IN, thread_series: UNF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-208-6933, 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
SMB157538
NSN: 5310-00-208-6933
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleKNURLED
nut_diameter0.500 INCHES NOMINAL IN
thread_class2B
nut_thickness0.625 INCHES NOMINAL IN
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE OVERALL
nominal_thread_size0.138 INCHES IN
counterbore_diameter0.125 INCHES NOMINAL NUT IN
nut_counterbore_depth0.500 INCHES NOMINAL NUT IN
thread_quantity_per_inch40
NSN5310-00-208-6933
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SMB157538 · 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
•
THREAD CLASS: 2B
•
THREAD QUANTITY PER INCH: 40
•
NUT THICKNESS: 0.625 INCHES NOMINAL IN
•
NUT DIAMETER: 0.500 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NUT STYLE: KNURLED
•
SURFACE TREATMENT: PHOSPHATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
THREAD QUANTITY PER INCH40
NUT THICKNESS0.625 INCHES NOMINAL IN
NUT DIAMETER0.500 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NUT STYLEKNURLED
SURFACE TREATMENTPHOSPHATE OVERALL
NOMINAL THREAD SIZE0.138 INCHES IN
MATERIALSTEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
2640PL1495665Interchangeable
interchangeable cross-reference
interchangeable
B211-17Interchangeable
interchangeable cross-reference
interchangeable
TR718-03Interchangeable
interchangeable cross-reference
interchangeable
202739-159Interchangeable
interchangeable cross-reference
interchangeable
57183Interchangeable
interchangeable cross-reference
interchangeable
SCE1210PPInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB157538?
SMB157538 is a NUT,PLAIN,KNURLED.
What parts can replace SMB157538?
There are 7 known substitutes for SMB157538: 2640PL1495665, B211-17, TR718-03 and 4 more. Substitute compatibility should be verified for your specific system.
Is SMB157538 still available?
SMB157538 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