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138566 — WASHER,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

138566: WASHER,LOCK.

The WASHER,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.894 INCHES MINIMUM AND 0.927 INCHES MAXIMUM IN, outside_diameter: 1.364 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, surface_treatment: CADMIUM OR ZINC OVERALL, material_thickness: 0.052 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-013-8566, 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
138566
NSN: 5310-00-013-8566
NIINs: 000138566, 015841123
FSC: 5310 — Nuts and Washers
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.894 INCHES MINIMUM AND 0.927 INCHES MAXIMUM IN
outside_diameter1.364 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
surface_treatmentCADMIUM OR ZINC OVERALL
material_thickness0.052 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
nondefinitive_spec/std_dataA TYPE
material_document_and_classification-QQ-S-633,FS 1060 1080 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-013-8566
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 138566 · 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 DOCUMENT AND CLASSIFICATION: -QQ-S-633,FS 1060 1080 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.364 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.052 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: A TYPE
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.894 INCHES MINIMUM AND 0.927 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIAL DOCUMENT AND CLASSIFICATION-QQ-S-633,FS 1060 1080 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.364 INCHES MINIMUM AND 1.410 INCHES MAXIMUM IN
MATERIAL THICKNESS0.052 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAA TYPE
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.894 INCHES MINIMUM AND 0.927 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
MILW6986TYPEAReference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 138566?
138566 is a WASHER,LOCK.
What parts can replace 138566?
There is 1 known substitute for 138566: MILW6986TYPEA. Substitute compatibility should be verified for your specific system.
What is the NSN for 138566?
138566 is cataloged in the U.S. Government catalog under NSN 5310-00-013-8566. 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.