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73A4 ✓ 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: COPPER ALLOY OVERALL, hole_diameter: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN, outside_diameter: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, style_designator: FLAT INTERNAL TEETH, material_thickness: 0.016 INCHES NOMINAL 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 5310-00-187-8595, 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
73A4
NSN: 5310-00-187-8595
FSC: 5310
CAGE: 0ZBJ4 — PHILIPS NORTH AMERICA LLC DBA PHILIPS HEALTHCARE (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
outside_diameter0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
style_designatorFLAT INTERNAL TEETH
material_thickness0.016 INCHES NOMINAL IN
NSN5310-00-187-8595
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 73A4 · 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
•
STYLE DESIGNATOR: FLAT INTERNAL TEETH
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL THICKNESS: 0.016 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIALCOPPER ALLOY OVERALL
MATERIAL THICKNESS0.016 INCHES NOMINAL IN
OUTSIDE DIAMETER0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
HOLE DIAMETER0.115 INCHES MINIMUM AND 0.123 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
T-244-MInterchangeable
interchangeable cross-reference
interchangeable
72-700476-1Interchangeable
interchangeable cross-reference
interchangeable
MS35431-3Interchangeable
interchangeable cross-reference
interchangeable
CF125Interchangeable
interchangeable cross-reference
interchangeable
1904Interchangeable
interchangeable cross-reference
interchangeable
418BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 73A4?
73A4 is a WASHER,LOCK.
What parts can replace 73A4?
There are 15 known substitutes for 73A4: T-244-M, 72-700476-1, MS35431-3 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 73A4?
73A4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-187-8595. 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