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K29638-3 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K29638-3: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, hole_diameter: 0.258 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, recess_diameter: 0.322 INCHES NOMINAL IN, outside_diameter: 0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, style_designator: CONCAVE. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-109-9027, 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
K29638-3
NSN: 5310-00-109-9027
NIINs: 001099027, 013587581
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
radius0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
hole_diameter0.258 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
recess_diameter0.322 INCHES NOMINAL IN
outside_diameter0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentSILVER OVERALL
material_thickness0.070 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
end_item_identificationTF-39 ENGINE
material_document_and_classificationAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-109-9027
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K29638-3 · 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
•
RADIUS: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
HEAT TREATMENT: AS FABRICATED
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.070 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.322 INCHES NOMINAL IN
•
SURFACE TREATMENT: SILVER OVERALL
TECHNICAL CHARACTERISTICS
RADIUS0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.360 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
MATERIAL THICKNESS0.070 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
RECESS DIAMETER0.322 INCHES NOMINAL IN
SURFACE TREATMENTSILVER OVERALL
HOLE DIAMETER0.258 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
9648M65P01Same 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 K29638-3?
K29638-3 is a WASHER,CONCAVE.
What parts can replace K29638-3?
There is 1 known substitute for K29638-3: 9648M65P01. Substitute compatibility should be verified for your specific system.
What is the NSN for K29638-3?
K29638-3 is cataloged in the U.S. Government catalog under NSN 5310-00-109-9027. 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.