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Technical Data Sheet
PartsTable / COMPONENT / B18.2.2
B18.2.2 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The B18.2.2 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-761-6882, 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
B18.2.2
NSN: 5310-00-761-6882
FSC: 5310
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
Part NumberB18.2.2
NSN5310-00-761-6882
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B18.2.2 · 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
•
NUT STYLE: HEXAGON
•
NUT HEIGHT: 0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
HARDNESS RATING: 121.0 BRINELL STANDARD MINIMUM
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 20
•
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 4 STYLE
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
NUT HEIGHT0.212 INCHES MINIMUM AND 0.226 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.250 INCHES IN
HARDNESS RATING121.0 BRINELL STANDARD MINIMUM
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH20
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 4 STYLE
SURFACE TREATMENTZINC OVERALL
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
3M348L3Interchangeable
interchangeable cross-reference
interchangeable
53488W-1032Interchangeable
interchangeable cross-reference
interchangeable
K19701P3Interchangeable
interchangeable cross-reference
interchangeable
2WC273Interchangeable
interchangeable cross-reference
interchangeable
71508Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS9141Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B18.2.2?
B18.2.2 is a B18.2.2.
What parts can replace B18.2.2?
There are 32 known substitutes for B18.2.2: 3M348L3, 53488W-1032, K19701P3 and 29 more. Substitute compatibility should be verified for your specific system.
Is B18.2.2 still available?
B18.2.2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026