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Technical Data Sheet
PartsTable / COMPONENT / 4M102-6
4M102-6 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN, hardness_rating: 57.0 ROCKWELL B MINIMUM AND 77.0 ROCKWELL B MAXIMUM, outside_diameter: 0.625 INCHES NOMINAL IN, surface_treatment: NICKEL OVERALL, material_thickness: 0.032 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-053-3983, 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
4M102-6
NSN: 5310-01-053-3983
FSC: 5310
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
hardness_rating57.0 ROCKWELL B MINIMUM AND 77.0 ROCKWELL B MAXIMUM
outside_diameter0.625 INCHES NOMINAL IN
surface_treatmentNICKEL OVERALL
material_thickness0.032 INCHES NOMINAL IN
internal_prebent_key_width0.065 INCHES NOMINAL IN
external_prebent_key_length0.060 INCHES NOMINAL IN
material_document_and_classificationQQ-B-613,FORM SHEET,1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-N-290,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-053-3983
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4M102-6 · 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-N-290,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-613,FORM SHEET,1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: NICKEL OVERALL
•
MATERIAL: COPPER ALLOY OVERALL
•
INTERNAL PREBENT KEY WIDTH: 0.065 INCHES NOMINAL IN
•
HARDNESS RATING: 57.0 ROCKWELL B MINIMUM AND 77.0 ROCKWELL B MAXIMUM
•
EXTERNAL PREBENT KEY LENGTH: 0.060 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-N-290,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613,FORM SHEET,1/2 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTNICKEL OVERALL
MATERIALCOPPER ALLOY OVERALL
INTERNAL PREBENT KEY WIDTH0.065 INCHES NOMINAL IN
HARDNESS RATING57.0 ROCKWELL B MINIMUM AND 77.0 ROCKWELL B MAXIMUM
EXTERNAL PREBENT KEY LENGTH0.060 INCHES NOMINAL IN
OUTSIDE DIAMETER0.625 INCHES NOMINAL IN
MATERIAL THICKNESS0.032 INCHES NOMINAL IN
HOLE DIAMETER0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
201829Interchangeable
interchangeable cross-reference
interchangeable
D904 ITEM7Interchangeable
interchangeable cross-reference
interchangeable
C662457Interchangeable
interchangeable cross-reference
interchangeable
25002250Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4M102-6?
4M102-6 is a WASHER,KEY.
What parts can replace 4M102-6?
There are 4 known substitutes for 4M102-6: 201829, D904 ITEM7, C662457 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4M102-6?
4M102-6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-053-3983. 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