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K29913-8 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K29913-8: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN, material: STEEL COMP 630 OR STEEL COMP 631 OVERALL, hole_diameter: 0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM, outside_diameter: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN, style_designator: CONCAVE. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-340-9084, 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
K29913-8
NSN: 5310-01-340-9084
NIINs: 013409084, 016878879
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
radius0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
materialSTEEL COMP 630 OR STEEL COMP 631 OVERALL
hole_diameter0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
outside_diameter0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentNICKEL AND CADMIUM OVERALL
material_thickness0.235 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
end_item_identificationKC-46 AIRCRAFT
material_document_and_classificationAMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationAMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
reference_number_differentiating_characteristicsITEM IS FAA CERTIFIED
NSN5310-01-340-9084
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K29913-8 · 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 DOCUMENT AND CLASSIFICATION: AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
RADIUS: 0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.235 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
SURFACE TREATMENT: NICKEL AND CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
RADIUS0.195 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
MATERIAL THICKNESS0.235 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
SURFACE TREATMENTNICKEL AND CADMIUM OVERALL
MATERIALSTEEL COMP 630 OR STEEL COMP 631 OVERALL
HOLE DIAMETER0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 2
942008-8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
70191-8Same 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 K29913-8?
K29913-8 is a WASHER,CONCAVE.
What parts can replace K29913-8?
There are 2 known substitutes for K29913-8: 942008-8, 70191-8. Substitute compatibility should be verified for your specific system.
What is the NSN for K29913-8?
K29913-8 is cataloged in the U.S. Government catalog under NSN 5310-01-340-9084. This indicates validated use in U.S. government and defense supply chains.
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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.