PartsTable
Technical Data Sheet
PartsTable / COMPONENT / MILW21338
MILW21338 ✓ 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: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OVERALL, hole_diameter: 5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN, outside_diameter: 7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN, style_designator: EXTERNAL AND INTERNAL PRE-BENT KEYS, surface_treatment: PASSIVATE OVERALL, material_thickness: 0.148 INCHES MINIMUM AND 0.164 INCHES MAXIMUM 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 5310-00-008-5904, 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
MILW21338
NSN: 5310-00-008-5904
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OVERALL
hole_diameter5.983 INCHES MINIMUM AND 6.018 INCHES MAXIMUM IN
outside_diameter7.062 INCHES MINIMUM AND 7.122 INCHES MAXIMUM IN
style_designatorEXTERNAL AND INTERNAL PRE-BENT KEYS
surface_treatmentPASSIVATE OVERALL
material_thickness0.148 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
external_key_quantity19
internal_key_quantity1
external_prebent_key_width0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
internal_prebent_key_width0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
internal_prebent_key_length0.312 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND 2 CLASS
NSN5310-00-008-5904
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILW21338 · 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: 0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY WIDTH: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-16232 TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: KEY
•
MATERIAL: STEEL COMP 8735 OVERALL
•
HOLE DIAMETER: 2.973 INCHES MINIMUM AND 3.003 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 3.375 INCHES MINIMUM AND 3.395 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL PREBENT KEY WIDTH0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
SURFACE TREATMENTPHOSPHATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-16232 TYPE 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORKEY
MATERIALSTEEL COMP 8735 OVERALL
HOLE DIAMETER2.973 INCHES MINIMUM AND 3.003 INCHES MAXIMUM IN
OUTSIDE DIAMETER3.375 INCHES MINIMUM AND 3.395 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
MIL-W-21338Interchangeable
interchangeable cross-reference
interchangeable
MS19070-093Interchangeable
interchangeable cross-reference
interchangeable
MS19070-103Interchangeable
interchangeable cross-reference
interchangeable
MS19070-163Interchangeable
interchangeable cross-reference
interchangeable
MS19070-123Interchangeable
interchangeable cross-reference
interchangeable
08P10847-2100Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy MILW21338?
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 MILW21338?
MILW21338 is a WASHER,KEY.
What parts can replace MILW21338?
There are 20 known substitutes for MILW21338: MIL-W-21338, MS19070-093, MS19070-103 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILW21338?
MILW21338 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-008-5904. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — MILW21338

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026