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Technical Data Sheet
PartsTable / COMPONENT / 10121523
10121523 ✓ 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 hole_diameter: 0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.175 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: CADMIUM AND CHROMATE OVERALL, material_thickness: 0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-579-5554, 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
10121523
NSN: 5310-00-579-5554
FSC: 5310
CAGE: A486G — NIMIKKEISTOKESKUS NCB FINLAND (FIN)
SPECIFICATIONS
materialSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
hole_diameter0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.175 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN
nondefinitive_spec/std_dataA TYPE
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-579-5554
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 10121523 · 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
•
HOLE DIAMETER: 0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
OUTSIDE DIAMETER: 0.175 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
MATERIAL: STEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
STYLE DESIGNATORFLAT INTERNAL TEETH
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
NONDEFINITIVE SPEC/STD DATAA TYPE
OUTSIDE DIAMETER0.175 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
MATERIALSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
MATERIAL THICKNESS0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
1202-00Interchangeable
interchangeable cross-reference
interchangeable
613205Interchangeable
interchangeable cross-reference
interchangeable
104-3S2AInterchangeable
interchangeable cross-reference
interchangeable
B107.500 CAT 19 TY1CL1STAInterchangeable
interchangeable cross-reference
interchangeable
0100Interchangeable
interchangeable cross-reference
interchangeable
GGG-P-480 TY1CL1STASZ1-1-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10121523?
10121523 is a WASHER,LOCK.
What parts can replace 10121523?
There are 22 known substitutes for 10121523: 1202-00, 613205, 104-3S2A and 19 more. Substitute compatibility should be verified for your specific system.
Is 10121523 still available?
10121523 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026