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M12555 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

M12555: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 2.588 INCHES MINIMUM AND 2.613 INCHES MAXIMUM IN, outside_diameter: 3.062 INCHES MINIMUM AND 3.092 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: CADMIUM OR ZINC OR CHROMATE OVERALL, material_thickness: 1.063 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-205-8244, 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
M12555
NSN: 5310-00-205-8244
FSC: 5310 — Nuts and Washers
CAGE: U0480 — MAWDSLEYS LTD (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter2.588 INCHES MINIMUM AND 2.613 INCHES MAXIMUM IN
outside_diameter3.062 INCHES MINIMUM AND 3.092 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentCADMIUM OR ZINC OR CHROMATE OVERALL
material_thickness1.063 INCHES NOMINAL IN
external_key_quantity19
external_prebent_key_width0.204 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
internal_prebent_key_width0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
internal_prebent_key_length0.125 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
overall_distance_including_keys3.578 INCHES NOMINAL IN
NSN5310-00-205-8244
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M12555 · 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
•
INTERNAL PREBENT KEY WIDTH: 0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 3.578 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 3.062 INCHES MINIMUM AND 3.092 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 1.063 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 19
•
INTERNAL PREBENT KEY LENGTH: 0.125 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OR ZINC OR CHROMATE OVERALL
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY WIDTH0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS3.578 INCHES NOMINAL IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER3.062 INCHES MINIMUM AND 3.092 INCHES MAXIMUM IN
MATERIAL THICKNESS1.063 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY19
INTERNAL PREBENT KEY LENGTH0.125 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OR ZINC OR CHROMATE OVERALL
EXTERNAL PREBENT KEY WIDTH0.204 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
A-364TCN-57 ITEM 20Reference document
Same NSN cross-reference
Reference document — Secondary reference
712085Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS19070-132Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
12Z335-244Reference document
Same NSN cross-reference
Reference document — Secondary reference
999-51813-0000Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M12555?
M12555 is a WASHER,KEY.
What parts can replace M12555?
There are 5 known substitutes for M12555: A-364TCN-57 ITEM 20, 712085, MS19070-132 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for M12555?
M12555 is cataloged in the U.S. Government catalog under NSN 5310-00-205-8244. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.