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B501-304 — WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B501-304: WASHER.

The WASHER is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5310-01-133-0773, 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
B501-304
NSN: 5310-01-133-0773
FSC: 5310 — Nuts and Washers
CAGE: 3X894 — CONTROL FLOW, INC. DBA CONTROL FLOW INC (USA)
SPECIFICATIONS
Part NumberB501-304
NSN5310-01-133-0773
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B501-304 · 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
SUBSTITUTES & CROSS-REFERENCES 2
B2127-78Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
112304Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B501-304?
B501-304 is a WASHER.
What parts can replace B501-304?
There are 2 known substitutes for B501-304: B2127-78, 112304. Substitute compatibility should be verified for your specific system.
What is the NSN for B501-304?
B501-304 is cataloged in the U.S. Government catalog under NSN 5310-01-133-0773. 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.