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K19301-4 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K19301-4: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN, material: STEEL OVERALL, recess_depth: 0.025 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN, hole_diameter: 0.317 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, recess_diameter: 0.411 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-221-7434, 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
K19301-4
NSN: 5310-00-221-7434
NIINs: 002217434, 008811706
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
radius0.297 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
materialSTEEL OVERALL
recess_depth0.025 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
hole_diameter0.317 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
recess_diameter0.411 INCHES NOMINAL IN
outside_diameter0.475 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.080 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
material_document_and_classificationAMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-221-7434
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K19301-4 · 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: 0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
•
HEAT TREATMENT: AS FABRICATED
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.470 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 4130 OVERALL
TECHNICAL CHARACTERISTICS
RADIUS0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.470 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN
MATERIAL THICKNESS0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
RECESS DIAMETER0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4130 OVERALL
HOLE DIAMETER0.331 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
9689M13P01Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K19301-4?
K19301-4 is a WASHER,CONCAVE.
What parts can replace K19301-4?
There is 1 known substitute for K19301-4: 9689M13P01. Substitute compatibility should be verified for your specific system.
What is the NSN for K19301-4?
K19301-4 is cataloged in the U.S. Government catalog under NSN 5310-00-221-7434. 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.