PartsTable
Technical Data Sheet
Download PDF

W6581 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

W6581: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, recess_depth: 0.003 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN, hole_diameter: 0.126 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN, recess_diameter: 0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN, outside_diameter: 0.278 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-209-2702, 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
W6581
NSN: 5310-00-209-2702
FSC: 5310 — Nuts and Washers
CAGE: 70255 — EMERSON ELECTRIC CO ALCO CONTROLS DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
recess_angle90.0 DEGREES NOMINAL
recess_depth0.003 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN
hole_diameter0.126 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN
recess_diameter0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
outside_diameter0.278 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentPASSIVATE OVERALL
material_thickness0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
material_document_and_classificationAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-209-2702
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: W6581 · 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
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.278 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.003 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 304 OVERALL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.278 INCHES MINIMUM AND 0.284 INCHES MAXIMUM IN
RECESS DEPTH0.003 INCHES MINIMUM AND 0.013 INCHES MAXIMUM IN
MATERIAL THICKNESS0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
RECESS DIAMETER0.135 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 304 OVERALL
HOLE DIAMETER0.126 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN
RECESS ANGLE90.0 DEGREES NOMINAL
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy W6581?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is W6581?
W6581 is a WASHER,RECESSED.
What is the NSN for W6581?
W6581 is cataloged in the U.S. Government catalog under NSN 5310-00-209-2702. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — W6581

✓ 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.