PartsTable
Technical Data Sheet
Download PDF

78-121 — FILTER,RADIO FREQUENCY INTERFERE

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

78-121: FILTER,RADIO FREQUENCY INTERFERE.

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include material: STEEL LOCATION NOT OTHERWISE SPECIFIED, body_shape: ROUND, body_width: 1.300 INCHES NOMINAL IN, body_height: 1.300 INCHES NOMINAL IN, body_length: 2.750 INCHES NOMINAL IN, design_type: DRY. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-209-4125, 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
MRO→ MRO_GENERAL→ 78-121
NSN: 5310-00-209-4125
NIINs: 002094125, 002846402, 003037804, 009106419, 011779108
FSC: 5310 — Nuts and Washers
CAGE: 96152 — BORG-WARNER CORP MARVEL-SCHEBLER/TILLOTSON DIV (USA)
SPECIFICATIONS
materialSTEEL LOCATION NOT OTHERWISE SPECIFIED
body_shapeROUND
body_width1.300 INCHES NOMINAL IN
body_height1.300 INCHES NOMINAL IN
body_length2.750 INCHES NOMINAL IN
design_typeDRY
coolant_typeAIR
body_materialMETAL
hole_diameter0.191 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN
overall_width15.000 INCHES NOMINAL IN
tube_quantity1
inclosure_typeENCASED
NSN5310-00-209-4125
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 78-121 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AN-QQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DISTANCE INCLUDING KEYS: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
•
HARDNESS RATING: 30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.104 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 6
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAN-QQ-P-421 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
OVERALL DISTANCE INCLUDING KEYS0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
HARDNESS RATING30.0 ROCKWELL B MINIMUM AND 50.0 ROCKWELL B MAXIMUM
STYLE DESIGNATORKEY
OUTSIDE DIAMETER0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
MATERIAL THICKNESS0.026 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
EXTERNAL STRAIGHT KEY WIDTH0.104 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY6
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
A78-121Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
Ready to buy 78-121?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 78-121?
78-121 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 78-121?
There is 1 known substitute for 78-121: A78-121. Substitute compatibility should be verified for your specific system.
What is the NSN for 78-121?
78-121 is cataloged in the U.S. Government catalog under NSN 5310-00-209-4125. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 78-121