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Technical Data Sheet
PartsTable / COMPONENT / B357-1K
B357-1K ✓ 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 material: ALUMINUM ALLOY 6061 OVERALL, thickness: 0.062 INCHES NOMINAL IN, hole_diameter: 0.118 INCHES NOMINAL IN, overall_diameter: 0.188 INCHES NOMINAL IN, surface_treatment: OXIDE FILM 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 5310-01-095-4015, 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
B357-1K
NSN: 5310-01-095-4015
FSC: 5310
CAGE: 30377 — SMITHS AEROSPACE, INC., ELECTRONIC SYSTEMS-GRAND RAPIDS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 OVERALL
thickness0.062 INCHES NOMINAL IN
hole_diameter0.118 INCHES NOMINAL IN
overall_diameter0.188 INCHES NOMINAL IN
surface_treatmentOXIDE FILM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
specification/standard_data30377-357-K MANUFACTURERS STANDARD
material_document_and_classificationQQ-A-200/9,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationMIL-C-5541,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-095-4015
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B357-1K · 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
•
OVERALL DIAMETER: 0.188 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.118 INCHES NOMINAL IN
•
SPECIFICATION/STANDARD DATA: 30377-357-K MANUFACTURERS STANDARD
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: OXIDE FILM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-200/9,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: ALUMINUM ALLOY 6061 OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.188 INCHES NOMINAL IN
HOLE DIAMETER0.118 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA30377-357-K MANUFACTURERS STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTOXIDE FILM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-200/9,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALALUMINUM ALLOY 6061 OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
THICKNESS0.062 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
35-71Interchangeable
interchangeable cross-reference
interchangeable
125252Interchangeable
interchangeable cross-reference
interchangeable
H-43375Interchangeable
interchangeable cross-reference
interchangeable
WC132Interchangeable
interchangeable cross-reference
interchangeable
R348Interchangeable
interchangeable cross-reference
interchangeable
6140042-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B357-1K?
B357-1K is a WASHER,FLAT.
What parts can replace B357-1K?
There are 14 known substitutes for B357-1K: 35-71, 125252, H-43375 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B357-1K?
B357-1K is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-095-4015. 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