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MILW21338TYPE1CLASS2SIZ12 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

MILW21338TYPE1CLASS2SIZ12: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include hole_diameter: 2.400 INCHES MINIMUM AND 2.425 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 2.844 INCHES MINIMUM AND 2.874 INCHES MAXIMUM IN, style_designator: KEY, surface_treatment: ZINC AND CHROMATE OVERALL, material_thickness: 0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-186-1069, 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
MILW21338TYPE1CLASS2SIZ12
NSN: 5310-00-186-1069
FSC: 5310 — Nuts and Washers
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
hole_diameter2.400 INCHES MINIMUM AND 2.425 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter2.844 INCHES MINIMUM AND 2.874 INCHES MAXIMUM IN
style_designatorKEY
surface_treatmentZINC AND CHROMATE OVERALL
material_thickness0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
external_key_quantity17
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 0.156 INCHES MAXIMUM IN
overall_distance_including_keys3.344 INCHES MAXIMUM IN
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-186-1069
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILW21338TYPE1CLASS2SIZ12 · 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: 3.344 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
OUTSIDE DIAMETER: 2.844 INCHES MINIMUM AND 2.874 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 17
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY WIDTH0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS3.344 INCHES MAXIMUM IN
HARDNESS RATING50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER2.844 INCHES MINIMUM AND 2.874 INCHES MAXIMUM IN
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY17
INTERNAL PREBENT KEY LENGTH0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
SURFACE TREATMENTZINC AND CHROMATE OVERALL
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MILW21338TYPE1CLASS2SIZ12?
MILW21338TYPE1CLASS2SIZ12 is a WASHER,KEY.
What is the NSN for MILW21338TYPE1CLASS2SIZ12?
MILW21338TYPE1CLASS2SIZ12 is cataloged in the U.S. Government catalog under NSN 5310-00-186-1069. 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.