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Technical Data Sheet
PartsTable / COMPONENT / A78-9
A78-9 ✓ 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 COIL,RADIO FREQUENCY is a the manufacturer industrial component. Key specifications include body_length: 0.410 INCHES NOMINAL IN, hole_diameter: 0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN, rating_method: WINDING TURNS SINGLE COMPONENT SINGLE WINDING, turn_quantity: 3-1/2 SINGLE COMPONENT SINGLE WINDING, coil_form_type: HOLLOW SINGLE COMPONENT, inclosure_type: OPEN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-167-0667, 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
A78-9
NSN: 5310-00-167-0667
FSC: 5310
CAGE: 96152 — BORG-WARNER CORP MARVEL-SCHEBLER/TILLOTSON DIV (USA)
SPECIFICATIONS
body_length0.410 INCHES NOMINAL IN
hole_diameter0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN
rating_methodWINDING TURNS SINGLE COMPONENT SINGLE WINDING
turn_quantity3-1/2 SINGLE COMPONENT SINGLE WINDING
coil_form_typeHOLLOW SINGLE COMPONENT
inclosure_typeOPEN
hardness_rating45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
mounting_methodTERMINAL SINGLE GROUP
outside_diameter0.489 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
core_constructionPOWDERED SINGLE COMPONENT
features_providedTINNED WIRE LEADS
NSN5310-00-167-0667
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A78-9 · 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
•
HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OR AISI NATIONAL SPEC ALL MATERIAL RESPONSES OR SAE NATIONAL SPEC ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
•
SURFACE TREATMENT: CADMIUM OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 1 STYLE AND A CLASS
•
MATERIAL THICKNESS: 0.047 INCHES MINIMUM AND 0.057 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 0.489 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OR AISI NATIONAL SPEC ALL MATERIAL RESPONSES OR SAE NATIONAL SPEC ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
SURFACE TREATMENTCADMIUM OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NONDEFINITIVE SPEC/STD DATA1 STYLE AND A CLASS
MATERIAL THICKNESS0.047 INCHES MINIMUM AND 0.057 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.489 INCHES NOMINAL IN
HOLE DIAMETER0.255 INCHES MINIMUM AND 0.267 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
23425Interchangeable
interchangeable cross-reference
interchangeable
5170525Interchangeable
interchangeable cross-reference
interchangeable
24423Interchangeable
interchangeable cross-reference
interchangeable
6220-21Interchangeable
interchangeable cross-reference
interchangeable
132634Interchangeable
interchangeable cross-reference
interchangeable
2300169Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A78-9?
A78-9 is a COIL,RADIO FREQUENCY.
What parts can replace A78-9?
There are 29 known substitutes for A78-9: 23425, 5170525, 24423 and 26 more. Substitute compatibility should be verified for your specific system.
Is A78-9 still available?
A78-9 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