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GB500A3 ✓ 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,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, hardness_rating: 34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM, recess_diameter: 0.308 INCHES NOMINAL IN, outside_diameter: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-803-1490, 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
GB500A3
NSN: 5310-00-803-1490
FSC: 5310
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
hardness_rating34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
recess_diameter0.308 INCHES NOMINAL IN
outside_diameter0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
style_designatorRECESSED
surface_treatmentCADMIUM OVERALL
material_thickness0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-803-1490
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: GB500A3 · 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
•
RECESS ANGLE: 90.0 DEGREES NOMINAL
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
•
MATERIAL THICKNESS: 0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
STYLE DESIGNATOR: RECESSED
•
SURFACE TREATMENT: CADMIUM OVERALL
•
RECESS DIAMETER: 0.308 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
RECESS ANGLE90.0 DEGREES NOMINAL
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.088 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
STYLE DESIGNATORRECESSED
SURFACE TREATMENTCADMIUM OVERALL
RECESS DIAMETER0.308 INCHES NOMINAL IN
HOLE DIAMETER0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
293-50Interchangeable
interchangeable cross-reference
interchangeable
2035Interchangeable
interchangeable cross-reference
interchangeable
CR106J129BF2Interchangeable
interchangeable cross-reference
interchangeable
21C2222-231Interchangeable
interchangeable cross-reference
interchangeable
A29350Interchangeable
interchangeable cross-reference
interchangeable
98-19604-01Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GB500A3?
GB500A3 is a WASHER,RECESSED.
What parts can replace GB500A3?
There are 18 known substitutes for GB500A3: 293-50, 2035, CR106J129BF2 and 15 more. Substitute compatibility should be verified for your specific system.
Is GB500A3 still available?
GB500A3 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