PartsTable
Technical Data Sheet
PartsTable / COMPONENT / ANSI B18.6.3.2-56UNC-2B
ANSI B18.6.3.2-56UNC-2B ✓ 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 ANSI B18.6.3.2-56UNC-2B is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-551-4743, 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
ANSI B18.6.3.2-56UNC-2B
NSN: 5310-00-551-4743
FSC: 5310
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
Part NumberANSI B18.6.3.2-56UNC-2B
NSN5310-00-551-4743
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ANSI B18.6.3.2-56UNC-2B · 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
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66,COMP 18-8 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 56
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.086 INCHES IN
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66,COMP 18-8 FED STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH56
BEARING SURFACE TYPECHAMFERED
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.086 INCHES IN
THREAD CLASS2B
NUT STYLEHEXAGON
WIDTH ACROSS FLATS0.180 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
N226P5Interchangeable
interchangeable cross-reference
interchangeable
4157400-35Interchangeable
interchangeable cross-reference
interchangeable
71910002001Interchangeable
interchangeable cross-reference
interchangeable
NLLHB05000Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
Ready to buy ANSI B18.6.3.2-56UNC-2B?
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 ANSI B18.6.3.2-56UNC-2B?
ANSI B18.6.3.2-56UNC-2B is a ANSI B18.6.3.2-56UNC-2B.
What parts can replace ANSI B18.6.3.2-56UNC-2B?
There are 4 known substitutes for ANSI B18.6.3.2-56UNC-2B: N226P5, 4157400-35, 71910002001 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ANSI B18.6.3.2-56UNC-2B?
ANSI B18.6.3.2-56UNC-2B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-551-4743. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — ANSI B18.6.3.2-56UNC-2B

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026