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820BC ✓ 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 WASHER,LOCK is a the manufacturer industrial component. Key specifications include hole_diameter: 0.168 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN, outside_diameter: 0.325 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, material_thickness: 0.018 INCHES MINIMUM AND 0.023 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-022-5843, 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
820BC
NSN: 5310-00-022-5843
FSC: 5310
CAGE: 78452 — MICRODOT INC EVERLOCK CHICAGO DIV (USA)
SPECIFICATIONS
hole_diameter0.168 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
outside_diameter0.325 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
material_thickness0.018 INCHES MINIMUM AND 0.023 INCHES MAXIMUM IN
NSN5310-00-022-5843
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 820BC · 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 THICKNESS: 0.018 INCHES MINIMUM AND 0.023 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.168 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.325 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.018 INCHES MINIMUM AND 0.023 INCHES MAXIMUM IN
HOLE DIAMETER0.168 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.325 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
STYLE DESIGNATORFLAT INTERNAL TEETH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
225843Interchangeable
interchangeable cross-reference
interchangeable
1213Interchangeable
interchangeable cross-reference
interchangeable
6213CE1TX9Interchangeable
interchangeable cross-reference
interchangeable
219-7NInterchangeable
Same NIIN cross-reference
interchangeable
MS35333-89Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 820BC?
820BC is a WASHER,LOCK.
What parts can replace 820BC?
There are 5 known substitutes for 820BC: 225843, 1213, 6213CE1TX9 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 820BC?
820BC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-022-5843. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026