PartsTable
Technical Data Sheet
Download PDF

M163861 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

M163861: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_depth: 2.5 MILLIMETERS NOMINAL MM, hole_diameter: 20.4 MILLIMETERS NOMINAL MM, outside_diameter: 40.0 MILLIMETERS NOMINAL MM, style_designator: CONCAVE, surface_treatment: PHOSPHATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-650-9033, 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
M163861
NSN: 5310-01-650-9033
FSC: 5310 — Nuts and Washers
CAGE: 0XWZ3 — DEERE & COMPANY DBA DEERE JOHN CO DIV JOHN DEERE SABD & GOVERNMENT SALES (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_depth2.5 MILLIMETERS NOMINAL MM
hole_diameter20.4 MILLIMETERS NOMINAL MM
outside_diameter40.0 MILLIMETERS NOMINAL MM
style_designatorCONCAVE
surface_treatmentPHOSPHATE OVERALL
material_thickness3.45 MILLIMETERS NOMINAL MM
end_item_identification1740-01-632-9476
NSN5310-01-650-9033
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M163861 · 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: CONCAVE
•
OUTSIDE DIAMETER: 40.0 MILLIMETERS NOMINAL MM
•
RECESS DEPTH: 2.5 MILLIMETERS NOMINAL MM
•
MATERIAL THICKNESS: 3.45 MILLIMETERS NOMINAL MM
•
COLOR: BLACK OVERALL
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORCONCAVE
OUTSIDE DIAMETER40.0 MILLIMETERS NOMINAL MM
RECESS DEPTH2.5 MILLIMETERS NOMINAL MM
MATERIAL THICKNESS3.45 MILLIMETERS NOMINAL MM
COLORBLACK OVERALL
SURFACE TREATMENTPHOSPHATE OVERALL
END ITEM IDENTIFICATION1740-01-632-9476
MATERIALSTEEL OVERALL
HOLE DIAMETER20.4 MILLIMETERS NOMINAL MM
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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
Ready to buy M163861?
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 M163861?
M163861 is a WASHER,CONCAVE.
What is the NSN for M163861?
M163861 is cataloged in the U.S. Government catalog under NSN 5310-01-650-9033. 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 — M163861

✓ 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.