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1229G423 ✓ 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 hole_diameter: 0.500 INCHES NOMINAL IN, outside_diameter: 0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, material_thickness: 0.037 INCHES MINIMUM AND 0.045 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 5310-00-011-5551, 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
1229G423
NSN: 5310-00-011-5551
FSC: 5310
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
hole_diameter0.500 INCHES NOMINAL IN
outside_diameter0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
material_thickness0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
NSN5310-00-011-5551
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1229G423 · 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
•
OUTSIDE DIAMETER: 0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
MATERIAL THICKNESS: 0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.867 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN
HOLE DIAMETER0.500 INCHES NOMINAL IN
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIAL THICKNESS0.037 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
5310PL0652572Interchangeable
interchangeable cross-reference
interchangeable
MS35333-33Interchangeable
interchangeable cross-reference
interchangeable
MILW6986Interchangeable
interchangeable cross-reference
interchangeable
7E07Interchangeable
interchangeable cross-reference
interchangeable
180440Interchangeable
interchangeable cross-reference
interchangeable
180612Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1229G423?
1229G423 is a WASHER,LOCK.
What parts can replace 1229G423?
There are 30 known substitutes for 1229G423: 5310PL0652572, MS35333-33, MILW6986 and 27 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1229G423?
1229G423 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-011-5551. 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