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SMB157240 ✓ 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 STRIP is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: STRIP, nut_width: 0.312 INCHES NOMINAL IN, nut_length: 1.188 INCHES NOMINAL IN, surface_treatment: PHOSPHATE OR PHOSPHATE MANGANESE OVERALL, material_thickness: 0.093 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 5310-00-590-8021, 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
SMB157240
NSN: 5310-00-590-8021
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSTRIP
nut_width0.312 INCHES NOMINAL IN
nut_length1.188 INCHES NOMINAL IN
surface_treatmentPHOSPHATE OR PHOSPHATE MANGANESE OVERALL
material_thickness0.093 INCHES NOMINAL IN
aperture_center_to_center_distance0.625 INCHES NOMINAL IN
mating_member_diameter_accommodated0.138 INCHES NOMINAL IN
material_document_and_classificationQQ-S-698 TEMPER 1/2 HARD NO 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-P-16232 TYPE M CLASS 2 MIL SPEC ALL TREATMENT RESPONSES OVERALL
NSN5310-00-590-8021
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SMB157240 · 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
•
NUT LENGTH: 1.188 INCHES NOMINAL IN
•
APERTURE CENTER TO CENTER DISTANCE: 0.625 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-P-16232 TYPE M CLASS 2 MIL SPEC ALL TREATMENT RESPONSES OVERALL
•
SURFACE TREATMENT: PHOSPHATE OR PHOSPHATE MANGANESE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-698 TEMPER 1/2 HARD NO 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NUT WIDTH: 0.312 INCHES NOMINAL IN
•
MATING MEMBER DIAMETER ACCOMMODATED: 0.138 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
NUT LENGTH1.188 INCHES NOMINAL IN
APERTURE CENTER TO CENTER DISTANCE0.625 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-P-16232 TYPE M CLASS 2 MIL SPEC ALL TREATMENT RESPONSES OVERALL
SURFACE TREATMENTPHOSPHATE OR PHOSPHATE MANGANESE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-698 TEMPER 1/2 HARD NO 2 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NUT WIDTH0.312 INCHES NOMINAL IN
MATING MEMBER DIAMETER ACCOMMODATED0.138 INCHES NOMINAL IN
MATERIAL THICKNESS0.093 INCHES NOMINAL IN
NUT STYLESTRIP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
5256-1Interchangeable
interchangeable cross-reference
interchangeable
P1678Interchangeable
interchangeable cross-reference
interchangeable
5256Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMB157240?
SMB157240 is a NUT STRIP.
What parts can replace SMB157240?
There are 3 known substitutes for SMB157240: 5256-1, P1678, 5256. Substitute compatibility should be verified for your specific system.
What is the NSN for SMB157240?
SMB157240 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-590-8021. 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