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Technical Data Sheet
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10121520 — Technical Data Sheet

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— · 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: 0.200 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, material_thickness: 0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN, nondefinitive_spec/std_data: 1 TYPE AND A GRADE AND 1 STYLE AND 1 COMPOSITION. This part is cataloged in the Federal Logistics Information System under NSN 5310-00-579-1596, 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
10121520
NSN: 5310-00-579-1596
FSC: 5310
CAGE: A486G — NIMIKKEISTOKESKUS NCB FINLAND (FIN)
SPECIFICATIONS
hole_diameter0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.200 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
material_thickness0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND A GRADE AND 1 STYLE AND 1 COMPOSITION
NSN5310-00-579-1596
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 10121520 · 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: 0.200 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
MATERIAL: STEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1054 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
•
TEST DATA DOCUMENT: 81348-FFW100 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
•
MATERIAL THICKNESS: 0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND A GRADE AND 1 STYLE AND 1 COMPOSITION
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER0.200 INCHES MAXIMUM IN
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIALSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1054 OR STEEL COMP 1055 OR STEEL COMP 1059 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
TEST DATA DOCUMENT81348-FFW100 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
MATERIAL THICKNESS0.010 INCHES MINIMUM AND 0.015 INCHES MAXIMUM IN
HOLE DIAMETER0.089 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND A GRADE AND 1 STYLE AND 1 COMPOSITION
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
1202-00InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
613205InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
104-3S2AInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
B107.500 CAT 19 TY1CL1STAInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
0100InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GGG-P-480 TY1CL1STASZ1-1-2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10121520?
10121520 is a WASHER,LOCK.
What parts can replace 10121520?
There are 19 known substitutes for 10121520: 1202-00, 613205, 104-3S2A and 16 more. Substitute compatibility should be verified for your specific system.
Is 10121520 still available?
10121520 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: October 2026