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Technical Data Sheet
PartsTable / COMPONENT / A78-375
A78-375 ✓ 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 1010 OVERALL, hole_diameter: 0.473 INCHES MINIMUM AND 0.477 INCHES MAXIMUM IN, hardness_rating: 70.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM, outside_diameter: 0.580 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN, special_features: ONE FLAT SIDE, style_designator: FLAT INTERNAL TEETH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-151-5011, 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
A78-375
NSN: 5310-00-151-5011
FSC: 5310
CAGE: 96152 — BORG-WARNER CORP MARVEL-SCHEBLER/TILLOTSON DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OVERALL
hole_diameter0.473 INCHES MINIMUM AND 0.477 INCHES MAXIMUM IN
hardness_rating70.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
outside_diameter0.580 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
special_featuresONE FLAT SIDE
style_designatorFLAT INTERNAL TEETH
surface_treatmentCADMIUM OVERALL
material_thickness0.033 INCHES NOMINAL IN
material_document_and_classificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-151-5011
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A78-375 · 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
•
HOLE DIAMETER: 0.473 INCHES MINIMUM AND 0.477 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL THICKNESS: 0.033 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.580 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
•
HARDNESS RATING: 70.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.473 INCHES MINIMUM AND 0.477 INCHES MAXIMUM IN
SPECIAL FEATURESONE FLAT SIDE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
MATERIAL THICKNESS0.033 INCHES NOMINAL IN
OUTSIDE DIAMETER0.580 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN
HARDNESS RATING70.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
STYLE DESIGNATORFLAT INTERNAL TEETH
MATERIALSTEEL COMP 1010 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
383-11Interchangeable
interchangeable cross-reference
interchangeable
PC5151489Interchangeable
interchangeable cross-reference
interchangeable
79334Interchangeable
interchangeable cross-reference
interchangeable
81597Interchangeable
interchangeable cross-reference
interchangeable
81597 ITEM 13Interchangeable
interchangeable cross-reference
interchangeable
78-375Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A78-375?
A78-375 is a WASHER,LOCK.
What parts can replace A78-375?
There are 6 known substitutes for A78-375: 383-11, PC5151489, 79334 and 3 more. Substitute compatibility should be verified for your specific system.
Is A78-375 still available?
A78-375 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026