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PartsTable / COMPONENT / SMB157018-2
SMB157018-2 ✓ 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 WASHER,FLAT is a the manufacturer industrial component. Key specifications include thickness: 0.0125 INCHES MINIMUM AND 0.0155 INCHES MAXIMUM IN, hole_diameter: 0.252 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN, heat_treatment: COLD ROLLED, overall_diameter: 0.375 INCHES NOMINAL IN, surface_treatment: PHOSPHATE OVERALL, peripheral_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-592-7740, 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
SMB157018-2
NSN: 5310-00-592-7740
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
thickness0.0125 INCHES MINIMUM AND 0.0155 INCHES MAXIMUM IN
hole_diameter0.252 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN
heat_treatmentCOLD ROLLED
overall_diameter0.375 INCHES NOMINAL IN
surface_treatmentPHOSPHATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAISI TEMPER 1/2 HARD ASSN STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationMIL-F-14072,FINISH E211 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-592-7740
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SMB157018-2 · 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
•
MATERIAL: STEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI TEMPER 1/2 HARD ASSN STD ALL MATERIAL RESPONSES OVERALL
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CENTER HOLE SHAPE STYLE: ROUND
•
THICKNESS: 0.0125 INCHES MINIMUM AND 0.0155 INCHES MAXIMUM IN
•
HEAT TREATMENT: COLD ROLLED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 1006 OR STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI TEMPER 1/2 HARD ASSN STD ALL MATERIAL RESPONSES OVERALL
SURFACE TREATMENTPHOSPHATE OVERALL
OVERALL DIAMETER0.375 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CENTER HOLE SHAPE STYLEROUND
THICKNESS0.0125 INCHES MINIMUM AND 0.0155 INCHES MAXIMUM IN
HEAT TREATMENTCOLD ROLLED
HOLE DIAMETER0.252 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,FINISH E211 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
5329-1Interchangeable
interchangeable cross-reference
interchangeable
A-1622Interchangeable
interchangeable cross-reference
interchangeable
BP12116Interchangeable
interchangeable cross-reference
interchangeable
CF138-50-38Interchangeable
interchangeable cross-reference
interchangeable
JE117Interchangeable
interchangeable cross-reference
interchangeable
3720-00B36-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB157018-2?
SMB157018-2 is a WASHER,FLAT.
What parts can replace SMB157018-2?
There are 8 known substitutes for SMB157018-2: 5329-1, A-1622, BP12116 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SMB157018-2?
SMB157018-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-592-7740. 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