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Technical Data Sheet
PartsTable / COMPONENT / A1804-1
A1804-1 ✓ 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: ALUMINUM ALLOY, end_item_identification: WEAPONS CODE 26, AIRCRAFT F-16, pump_design_control_activity: 26433, pump_model_number_for_which_designed: 9C125-3, part_name_assigned_by_controlling_agency: HOUSING, PUMP. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-010-8208, 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
A1804-1
NSN: 5310-00-010-8208
FSC: 5310
CAGE: 98889 — AEROCONTROLEX GROUP, INC. DIV TALLEY ACTUATORS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
end_item_identificationWEAPONS CODE 26, AIRCRAFT F-16
pump_design_control_activity26433
pump_model_number_for_which_designed9C125-3
part_name_assigned_by_controlling_agencyHOUSING, PUMP
NSN5310-00-010-8208
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A1804-1 · 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
•
MATERIAL THICKNESS: 0.003 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.594 INCHES NOMINAL IN
•
INTERNAL KEYWAY QUANTITY: 1
•
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
•
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
MATERIAL THICKNESS0.003 INCHES NOMINAL IN
OUTSIDE DIAMETER0.594 INCHES NOMINAL IN
INTERNAL KEYWAY QUANTITY1
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
INTERNAL KEYWAY WIDTH0.064 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
D1020230Interchangeable
interchangeable cross-reference
interchangeable
44111Interchangeable
interchangeable cross-reference
interchangeable
503-S 41Interchangeable
interchangeable cross-reference
interchangeable
18041Interchangeable
interchangeable cross-reference
interchangeable
385-8700-1194391ALT8PC85Interchangeable
interchangeable cross-reference
interchangeable
49MC1133N2-1ITEM28Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A1804-1?
A1804-1 is a WASHER,KEYWAY.
What parts can replace A1804-1?
There are 16 known substitutes for A1804-1: D1020230, 44111, 503-S 41 and 13 more. Substitute compatibility should be verified for your specific system.
Is A1804-1 still available?
A1804-1 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