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4W-33551-8 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

4W-33551-8: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5310-01-283-3565, 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
4W-33551-8
NSN: 5310-01-283-3565
FSC: 5310 — Nuts and Washers
CAGE: 09519 — NEW PHILADELPHIA FAN CO BUFFALO FORGE MARINE FANS (USA)
SPECIFICATIONS
Part Number4W-33551-8
NSN5310-01-283-3565
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4W-33551-8 · 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
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 4
STR 456Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
R1-9303 PIECE 44Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
B4W-33551-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
9W-58014 PC NO 21Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 4W-33551-8?
4W-33551-8 is a WASHER,FLAT.
What parts can replace 4W-33551-8?
There are 4 known substitutes for 4W-33551-8: STR 456, R1-9303 PIECE 44, B4W-33551-8 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4W-33551-8?
4W-33551-8 is cataloged in the U.S. Government catalog under NSN 5310-01-283-3565. 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.