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Technical Data Sheet
PartsTable / COMPONENT / 10388905
10388905 ✓ 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: 0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.454 INCHES NOMINAL IN, style_designator: COUNTERSINK EXTERNAL TEETH, countersink_angle: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM, surface_treatment: CADMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-194-9211, 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
10388905
NSN: 5310-00-194-9211
FSC: 5310
CAGE: A486G — NIMIKKEISTOKESKUS NCB FINLAND (FIN)
SPECIFICATIONS
materialSTEEL COMP 1050 OR STEEL COMP 1551 OR STEEL COMP 1552 OR STEEL COMP 1053 OR STEEL COMP 1055 OR STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OVERALL
hole_diameter0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.454 INCHES NOMINAL IN
style_designatorCOUNTERSINK EXTERNAL TEETH
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
surface_treatmentCADMIUM OVERALL
material_thickness0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
nondefinitive_spec/std_data4 TYPE AND 1 STYLE AND A GRADE AND 1 COMPOSITION
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
NSN5310-00-194-9211
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 10388905 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: COUNTERSINK EXTERNAL TEETH
•
SURFACE TREATMENT: CADMIUM OVERALL
•
COUNTERSINK ANGLE: 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL THICKNESS0.020 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORCOUNTERSINK EXTERNAL TEETH
SURFACE TREATMENTCADMIUM OVERALL
COUNTERSINK ANGLE80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
END ITEM IDENTIFICATIONMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER0.454 INCHES NOMINAL IN
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
1234582Interchangeable
interchangeable cross-reference
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114614Interchangeable
interchangeable cross-reference
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7416548Interchangeable
interchangeable cross-reference
interchangeable
1518Interchangeable
interchangeable cross-reference
interchangeable
114617Interchangeable
interchangeable cross-reference
interchangeable
1829P536Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 10388905?
10388905 is a WASHER,LOCK.
What parts can replace 10388905?
There are 29 known substitutes for 10388905: 1234582, 114614, 7416548 and 26 more. Substitute compatibility should be verified for your specific system.
Is 10388905 still available?
10388905 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