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PartsTable / COMPONENT / A02157-103
A02157-103 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.446 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: CADMIUM OVERALL, material_thickness: 0.016 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN, nondefinitive_spec/std_data: A TYPE AND A GRADE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-209-0788, 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
A02157-103
NSN: 5310-00-209-0788
FSC: 5310
CAGE: 77926 — ROSEN RAYMOND AND CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.446 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentCADMIUM OVERALL
material_thickness0.016 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
nondefinitive_spec/std_dataA TYPE AND A GRADE
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-209-0788
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A02157-103 · 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
•
OUTSIDE DIAMETER: 0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: FLAT EXTERNAL TEETH
•
MATERIAL: STEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
•
MATERIAL THICKNESS: 0.016 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
END ITEM IDENTIFICATIONARMORED MULTI-PURPOSE VEHICLE (AMPV); A4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORFLAT EXTERNAL TEETH
MATERIALSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
MATERIAL THICKNESS0.016 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
HOLE DIAMETER0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
110600Interchangeable
interchangeable cross-reference
interchangeable
FFS92Interchangeable
interchangeable cross-reference
interchangeable
MIL-A-25707/3Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-25707/3Interchangeable
interchangeable cross-reference
interchangeable
2282-1Interchangeable
interchangeable cross-reference
interchangeable
110-600F4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A02157-103?
A02157-103 is a WASHER,LOCK.
What parts can replace A02157-103?
There are 23 known substitutes for A02157-103: 110600, FFS92, MIL-A-25707/3 and 20 more. Substitute compatibility should be verified for your specific system.
Is A02157-103 still available?
A02157-103 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