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PartsTable / COMPONENT / AN7503-31
AN7503-31 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1020 OVERALL, hole_diameter: 1.945 INCHES MINIMUM AND 1.955 INCHES MAXIMUM IN, outside_diameter: 2.375 INCHES MINIMUM IN, style_designator: KEY, material_thickness: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, internal_straight_key_width: 0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM 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 5310-00-222-0716, 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
AN7503-31
NSN: 5310-00-222-0716
FSC: 5310
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1020 OVERALL
hole_diameter1.945 INCHES MINIMUM AND 1.955 INCHES MAXIMUM IN
outside_diameter2.375 INCHES MINIMUM IN
style_designatorKEY
material_thickness0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
internal_key_quantity1
internal_straight_key_width0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
material_document_and_classificationASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
distance_from_centerline_to_top_of_internal_key0.845 INCHES MINIMUM AND 0.855 INCHES MAXIMUM IN
NSN5310-00-222-0716
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN7503-31 · 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 DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: KEY
•
INTERNAL KEY QUANTITY: 1
•
OUTSIDE DIAMETER: 2.375 INCHES MINIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.845 INCHES MINIMUM AND 0.855 INCHES MAXIMUM IN
•
HOLE DIAMETER: 1.945 INCHES MINIMUM AND 1.955 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1020 OVERALL
•
MATERIAL THICKNESS: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORKEY
INTERNAL KEY QUANTITY1
OUTSIDE DIAMETER2.375 INCHES MINIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.845 INCHES MINIMUM AND 0.855 INCHES MAXIMUM IN
HOLE DIAMETER1.945 INCHES MINIMUM AND 1.955 INCHES MAXIMUM IN
MATERIALSTEEL COMP 1018 OR STEEL COMP 1025 OR STEEL COMP 1020 OVERALL
MATERIAL THICKNESS0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
INTERNAL STRAIGHT KEY WIDTH0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
A356Interchangeable
interchangeable cross-reference
interchangeable
C842924Interchangeable
interchangeable cross-reference
interchangeable
B130534Interchangeable
interchangeable cross-reference
interchangeable
SAE J512 8-4 010101BInterchangeable
interchangeable cross-reference
interchangeable
04056-0804Interchangeable
interchangeable cross-reference
interchangeable
A356.2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN7503-31?
AN7503-31 is a WASHER,KEY.
What parts can replace AN7503-31?
There are 9 known substitutes for AN7503-31: A356, C842924, B130534 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN7503-31?
AN7503-31 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-222-0716. 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