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K39787-4 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K39787-4: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN, material: STEEL OVERALL, recess_depth: 0.054 INCHES NOMINAL IN, hole_diameter: 0.335 INCHES MINIMUM AND 0.345 INCHES MAXIMUM IN, outside_diameter: 0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN, style_designator: CONCAVE. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-646-0116, 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
K39787-4
NSN: 5310-01-646-0116
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
radius0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
materialSTEEL OVERALL
recess_depth0.054 INCHES NOMINAL IN
hole_diameter0.335 INCHES MINIMUM AND 0.345 INCHES MAXIMUM IN
outside_diameter0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
style_designatorCONCAVE
material_thickness0.090 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
end_item_identificationB1-BACFT
material_document_and_classificationAMS6358 ASSN STD SINGLE MATERIAL RESPONSE OR AMS6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-646-0116
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K39787-4 · 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
•
RADIUS: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS6358 ASSN STD SINGLE MATERIAL RESPONSE OR AMS6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.054 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.090 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
RADIUS0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS6358 ASSN STD SINGLE MATERIAL RESPONSE OR AMS6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.505 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
RECESS DEPTH0.054 INCHES NOMINAL IN
MATERIAL THICKNESS0.090 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONB1-BACFT
MATERIALSTEEL OVERALL
HOLE DIAMETER0.335 INCHES MINIMUM AND 0.345 INCHES MAXIMUM IN
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 1
LE153-0002-0004Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K39787-4?
K39787-4 is a WASHER,CONCAVE.
What parts can replace K39787-4?
There is 1 known substitute for K39787-4: LE153-0002-0004. Substitute compatibility should be verified for your specific system.
What is the NSN for K39787-4?
K39787-4 is cataloged in the U.S. Government catalog under NSN 5310-01-646-0116. 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.