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Technical Data Sheet
PartsTable / COMPONENT / 556-1803
556-1803 ✓ 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,FINISHING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, recess_angle: 45.0 DEGREES NOMINAL, hole_diameter: 0.203 INCHES NOMINAL IN, overall_height: 0.081 INCHES NOMINAL IN, recess_diameter: 0.296 INCHES NOMINAL IN, outside_diameter: 0.468 INCHES NOMINAL 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 5310-00-596-1776, 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
556-1803
NSN: 5310-00-596-1776
FSC: 5310
CAGE: 11530 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN INFORMATION SYSTEMS & GLOBAL SOLUTIONS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
recess_angle45.0 DEGREES NOMINAL
hole_diameter0.203 INCHES NOMINAL IN
overall_height0.081 INCHES NOMINAL IN
recess_diameter0.296 INCHES NOMINAL IN
outside_diameter0.468 INCHES NOMINAL IN
style_designatorFINISHING
material_thickness0.010 INCHES NOMINAL IN
NSN5310-00-596-1776
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 556-1803 · 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 ALLOY OVERALL
•
MATERIAL THICKNESS: 0.010 INCHES NOMINAL IN
•
RECESS ANGLE: 45.0 DEGREES NOMINAL
•
RECESS DIAMETER: 0.296 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.203 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FINISHING
•
OUTSIDE DIAMETER: 0.468 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
MATERIAL THICKNESS0.010 INCHES NOMINAL IN
RECESS ANGLE45.0 DEGREES NOMINAL
RECESS DIAMETER0.296 INCHES NOMINAL IN
HOLE DIAMETER0.203 INCHES NOMINAL IN
STYLE DESIGNATORFINISHING
OUTSIDE DIAMETER0.468 INCHES NOMINAL IN
OVERALL HEIGHT0.081 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
21146Interchangeable
interchangeable cross-reference
interchangeable
4994913Interchangeable
interchangeable cross-reference
interchangeable
22314-8Interchangeable
interchangeable cross-reference
interchangeable
CA1406Interchangeable
interchangeable cross-reference
interchangeable
A2308-3Interchangeable
interchangeable cross-reference
interchangeable
FIX WOOD PATCHInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 556-1803?
556-1803 is a WASHER,FINISHING.
What parts can replace 556-1803?
There are 12 known substitutes for 556-1803: 21146, 4994913, 22314-8 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 556-1803?
556-1803 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-596-1776. 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