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K8831 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K8831: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 347 OVERALL, thickness: 0.018 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN, hole_diameter: 0.195 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, hardness_rating: 26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM, overall_diameter: 0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-849-8970, 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
K8831
NSN: 5310-00-849-8970
FSC: 5310 — Nuts and Washers
CAGE: K0680 — ROLLS-ROYCE AIRLINES (GBR)
SPECIFICATIONS
materialSTEEL COMP 347 OVERALL
thickness0.018 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
hole_diameter0.195 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
hardness_rating26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM
overall_diameter0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAMS 5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-849-8970
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K8831 · 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
•
OVERALL DIAMETER: 0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
•
HEAT TREATMENT: AS FABRICATED
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 347 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER0.400 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5512 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 347 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.195 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
THICKNESS0.018 INCHES MINIMUM AND 0.020 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
6864088Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K8831?
K8831 is a WASHER,FLAT.
What parts can replace K8831?
There is 1 known substitute for K8831: 6864088. Substitute compatibility should be verified for your specific system.
What is the NSN for K8831?
K8831 is cataloged in the U.S. Government catalog under NSN 5310-00-849-8970. 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.