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Technical Data Sheet

NB/0/221252 REF 7 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

NB/0/221252 REF 7: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER OVERALL, end_item_identification: WATER JET SHAFT, part_name_assigned_by_controlling_agency: COPPER WASHER. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-538-6801, 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
NB/0/221252 REF 7
NSN: 5310-01-538-6801
FSC: 5310 — Nuts and Washers
CAGE: U1570 — MICHELL BEARINGS LIMITED (GBR)
SPECIFICATIONS
materialCOPPER OVERALL
end_item_identificationWATER JET SHAFT
part_name_assigned_by_controlling_agencyCOPPER WASHER
NSN5310-01-538-6801
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: NB/0/221252 REF 7 · 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
•
MATERIAL: COPPER OVERALL
TECHNICAL CHARACTERISTICS
PART NAME ASSIGNED BY CONTROLLING AGENCYCOPPER WASHER
END ITEM IDENTIFICATIONWATER JET SHAFT
MATERIALCOPPER OVERALL
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
WA/X/223544Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NB/0/221252 REF 7?
NB/0/221252 REF 7 is a WASHER,FLAT.
What parts can replace NB/0/221252 REF 7?
There is 1 known substitute for NB/0/221252 REF 7: WA/X/223544. Substitute compatibility should be verified for your specific system.
What is the NSN for NB/0/221252 REF 7?
NB/0/221252 REF 7 is cataloged in the U.S. Government catalog under NSN 5310-01-538-6801. 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.