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PartsTable / COMPONENT / A1804-2
A1804-2 ✓ 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 WASHER,KEYWAY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, outside_diameter: 0.594 INCHES NOMINAL IN, material_thickness: 0.005 INCHES NOMINAL IN, internal_keyway_width: 0.064 INCHES NOMINAL IN, material_document_and_classification: MIL-S-5059,COMP 301,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-8209, 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
A1804-2
NSN: 5310-00-010-8209
FSC: 5310
CAGE: 98889 — AEROCONTROLEX GROUP, INC. DIV TALLEY ACTUATORS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
outside_diameter0.594 INCHES NOMINAL IN
material_thickness0.005 INCHES NOMINAL IN
internal_keyway_width0.064 INCHES NOMINAL IN
internal_keyway_quantity1
material_document_and_classificationMIL-S-5059,COMP 301,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OVERALL
distance_from_centerline_to_bottom_of_internal_keyway0.288 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN
NSN5310-00-010-8209
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A1804-2 · 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
•
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY: 0.288 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN
•
INTERNAL KEYWAY QUANTITY: 1
•
OUTSIDE DIAMETER: 0.594 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059,COMP 301,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OVERALL
•
HOLE DIAMETER: 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.005 INCHES NOMINAL IN
•
INTERNAL KEYWAY WIDTH: 0.064 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DISTANCE FROM CENTERLINE TO BOTTOM OF INTERNAL KEYWAY0.288 INCHES MINIMUM AND 0.295 INCHES MAXIMUM IN
INTERNAL KEYWAY QUANTITY1
OUTSIDE DIAMETER0.594 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059,COMP 301,1/2 HARD MIL SPEC 1ST MATERIAL RESPONSE OVERALL
HOLE DIAMETER0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
MATERIAL THICKNESS0.005 INCHES NOMINAL IN
INTERNAL KEYWAY WIDTH0.064 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
1804-2Interchangeable
interchangeable cross-reference
interchangeable
MX2930AUSMInterchangeable
interchangeable cross-reference
interchangeable
350-RTInterchangeable
interchangeable cross-reference
interchangeable
918 42Interchangeable
interchangeable cross-reference
interchangeable
13342Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A1804-2?
A1804-2 is a WASHER,KEYWAY.
What parts can replace A1804-2?
There are 5 known substitutes for A1804-2: 1804-2, MX2930AUSM, 350-RT and 2 more. Substitute compatibility should be verified for your specific system.
Is A1804-2 still available?
A1804-2 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