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Technical Data Sheet
PartsTable / COMPONENT / WA21-3
WA21-3 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN, style_designator: FLAT EXTERNAL TEETH, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-011-4601, 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
WA21-3
NSN: 5310-00-011-4601
FSC: 5310
CAGE: 01843 — AMBAC INTERNATIONAL CORPORATION DIV AMBAC INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
style_designatorFLAT EXTERNAL TEETH
surface_treatmentCADMIUM OVERALL
material_thickness0.016 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
material_document_and_classificationFED STD 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-011-4601
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: WA21-3 · 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: CADMIUM OVERALL
•
HOLE DIAMETER: 0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL THICKNESS: 0.016 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM OVERALL
HOLE DIAMETER0.141 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.305 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL THICKNESS0.016 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
STYLE DESIGNATORFLAT EXTERNAL TEETH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
114601Interchangeable
interchangeable cross-reference
interchangeable
601606-000Interchangeable
interchangeable cross-reference
interchangeable
6096476Interchangeable
interchangeable cross-reference
interchangeable
861106Interchangeable
interchangeable cross-reference
interchangeable
MILW6986TYPEBInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is WA21-3?
WA21-3 is a WASHER,LOCK.
What parts can replace WA21-3?
There are 5 known substitutes for WA21-3: 114601, 601606-000, 6096476 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for WA21-3?
WA21-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-011-4601. 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