PartsTable
Technical Data Sheet

M81935/3-4 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

M81935/3-4: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, hole_diameter: 0.256 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN, hardness_rating: 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM, outside_diameter: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN, style_designator: INTERNAL PREBENT KEY, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-070-2113, 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
M81935/3-4
NSN: 5310-01-070-2113
FSC: 5310 — Nuts and Washers
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
hole_diameter0.256 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM
outside_diameter0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
style_designatorINTERNAL PREBENT KEY
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.060 INCHES NOMINAL IN
wire_hole_diameter0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
internal_prebent_key_width0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
specification/standard_data81349-MIL-B-81935/3 GOVERNMENT SPECIFICATION
material_document_and_classificationMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-070-2113
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M81935/3-4 · 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
•
WIRE HOLE DIAMETER: 0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
INTERNAL PREBENT KEY WIDTH: 0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
•
HARDNESS RATING: 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: INTERNAL PREBENT KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.060 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIRE HOLE DIAMETER0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
INTERNAL PREBENT KEY WIDTH0.050 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORINTERNAL PREBENT KEY
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
MATERIAL THICKNESS0.060 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81349-MIL-B-81935/3 GOVERNMENT SPECIFICATION
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 3
10122078Reference document
Same NSN cross-reference
Reference document — Informative reference only
MIL-B-81935/3Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS81935/3Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy M81935/3-4?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is M81935/3-4?
M81935/3-4 is a WASHER,KEY.
What parts can replace M81935/3-4?
There are 3 known substitutes for M81935/3-4: 10122078, MIL-B-81935/3, SAE-AS81935/3. Substitute compatibility should be verified for your specific system.
What is the NSN for M81935/3-4?
M81935/3-4 is cataloged in the U.S. Government catalog under NSN 5310-01-070-2113. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — M81935/3-4

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.