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Technical Data Sheet
PartsTable / COMPONENT / 503A1-3
503A1-3 ✓ 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 material: STEEL COMP 302 OR STEEL COMP 420 OVERALL, hole_diameter: 0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN, hardness_rating: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM, outside_diameter: 0.202 INCHES MAXIMUM IN, style_designator: SPLIT HELICAL-RIGHT HAND, material_thickness: 0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-058-2949, 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
503A1-3
NSN: 5310-00-058-2949
FSC: 5310
CAGE: 94033 — CARDWELL CONDENSER CORP LAPOINTE-ADMIRAL DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 420 OVERALL
hole_diameter0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
outside_diameter0.202 INCHES MAXIMUM IN
style_designatorSPLIT HELICAL-RIGHT HAND
material_thickness0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
nondefinitive_spec/std_dataC CLASS AND 1 STYLE
specification/standard_data81348-FF-W-84 GOVERNMENT SPECIFICATION
departure_from_cited_documentAS MODIFIED BY MATERIAL
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OR QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
NSN5310-00-058-2949
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 503A1-3 · 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
•
SPECIFICATION/STANDARD DATA: 81348-FF-W-84 GOVERNMENT SPECIFICATION
•
DEPARTURE FROM CITED DOCUMENT: AS MODIFIED BY MATERIAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OR QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
MATERIAL: STEEL COMP 302 OR STEEL COMP 420 OVERALL
•
HARDNESS RATING: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
OUTSIDE DIAMETER: 0.202 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIFICATION/STANDARD DATA81348-FF-W-84 GOVERNMENT SPECIFICATION
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY MATERIAL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OR QQ-S-763,COND A FED SPEC ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
MATERIALSTEEL COMP 302 OR STEEL COMP 420 OVERALL
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER0.202 INCHES MAXIMUM IN
MATERIAL THICKNESS0.020 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
HOLE DIAMETER0.115 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAC CLASS AND 1 STYLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
104SInterchangeable
interchangeable cross-reference
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Y69G204Interchangeable
interchangeable cross-reference
interchangeable
WG50082PC71Interchangeable
interchangeable cross-reference
interchangeable
43-1132Interchangeable
interchangeable cross-reference
interchangeable
480963SKInterchangeable
interchangeable cross-reference
interchangeable
26769Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 503A1-3?
503A1-3 is a WASHER,LOCK.
What parts can replace 503A1-3?
There are 23 known substitutes for 503A1-3: 104S, Y69G204, WG50082PC71 and 20 more. Substitute compatibility should be verified for your specific system.
Is 503A1-3 still available?
503A1-3 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