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PartsTable / COMPONENT / B56-204
B56-204 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 1.875 INCHES NOMINAL IN, heat_treatment: AS FABRICATED, overall_diameter: 2.500 INCHES NOMINAL IN, peripheral_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-115-1823, 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
B56-204
NSN: 5310-00-115-1823
FSC: 5310
CAGE: 97153 — GOODRICH CORPORATION DIV COLLINS AEROSPACE, LANDING SYSTEMS (WHEELS & BRAKES) (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter1.875 INCHES NOMINAL IN
heat_treatmentAS FABRICATED
overall_diameter2.500 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-115-1823
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B56-204 · 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: STEEL OVERALL
•
HEAT TREATMENT: AS FABRICATED
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.875 INCHES NOMINAL IN
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
OVERALL DIAMETER: 2.500 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
HEAT TREATMENTAS FABRICATED
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER1.875 INCHES NOMINAL IN
THICKNESS0.031 INCHES NOMINAL IN
OVERALL DIAMETER2.500 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
490993Interchangeable
interchangeable cross-reference
interchangeable
5620-4AInterchangeable
interchangeable cross-reference
interchangeable
5620-4Interchangeable
interchangeable cross-reference
interchangeable
510-374-96Interchangeable
interchangeable cross-reference
interchangeable
654443-1Interchangeable
interchangeable cross-reference
interchangeable
NB25025E-0400-4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B56-204?
B56-204 is a WASHER,FLAT.
What parts can replace B56-204?
There are 6 known substitutes for B56-204: 490993, 5620-4A, 5620-4 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B56-204?
B56-204 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-115-1823. 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