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MILW6986TYPEA ✓ 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 COMP 410 OVERALL, hole_diameter: 0.769 INCHES MINIMUM AND 0.795 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM, outside_diameter: 1.220 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: PASSIVATE 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 5310-00-011-5550, 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
MILW6986TYPEA
NSN: 5310-00-011-5550
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
hole_diameter0.769 INCHES MINIMUM AND 0.795 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
outside_diameter1.220 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentPASSIVATE OVERALL
material_thickness0.047 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
nondefinitive_spec/std_data1 TYPE AND 1 STYLE AND A GRADE AND 2 COMPOSITION
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-35,TY 2 FED SPEC SINGLE TREATMENT RESPONSE OR QQ-P-35,TY 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-011-5550
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILW6986TYPEA · 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
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
MATERIAL: STEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OR STEEL COMP 1065 OR STEEL COMP 1566 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1071 OR STEEL COMP 1572 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OVERALL
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
HOLE DIAMETER: 0.448 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.740 INCHES MINIMUM AND 0.789 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.032 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIALSTEEL COMP 1060 OR STEEL COMP 1561 OR STEEL COMP 1064 OR STEEL COMP 1065 OR STEEL COMP 1566 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1071 OR STEEL COMP 1572 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OVERALL
NONDEFINITIVE SPEC/STD DATAA TYPE
HOLE DIAMETER0.448 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.740 INCHES MINIMUM AND 0.789 INCHES MAXIMUM IN
MATERIAL THICKNESS0.032 INCHES MINIMUM AND 0.040 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
201505Interchangeable
interchangeable cross-reference
interchangeable
SUPER TRUMPInterchangeable
interchangeable cross-reference
interchangeable
5D-6209-02Interchangeable
interchangeable cross-reference
interchangeable
6112740Interchangeable
interchangeable cross-reference
interchangeable
11TGSM929Interchangeable
interchangeable cross-reference
interchangeable
CU90839001-0Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILW6986TYPEA?
MILW6986TYPEA is a WASHER,LOCK.
What parts can replace MILW6986TYPEA?
There are 11 known substitutes for MILW6986TYPEA: 201505, SUPER TRUMP, 5D-6209-02 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILW6986TYPEA?
MILW6986TYPEA is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-011-5550. 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.
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Last verified: July 2026