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Technical Data Sheet
PartsTable / COMPONENT / 7904-1
7904-1 ✓ Verified by PartsTable
Hama · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

- Special cable for active subwoofers<br>- RCA plug with metal body and new kink protection element<br>- 24k gold-plated contacts<br>- Highly flexible cable material<br>- Outside diameter: 7 mm<br>- Packed in blister This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-432-9070, 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
7904-1
NSN: 3120-00-432-9070
FSC: 3120
CAGE: 09455 — RBC TRANSPORT DYNAMICS CORP DIV RBC TRANSPORT DYNAMICS (USA)
SPECIFICATIONS
materialPAPER OVERALL
body_width1.750 INCHES NOMINAL IN
body_height2.688 INCHES NOMINAL IN
body_length1.750 INCHES NOMINAL IN
bore_diameter3.5010 INCHES MINIMUM AND 3.5022 INCHES MAXIMUM IN
hole_diameter0.625 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
inclosure_typeFULLY INCLOSED
mounting_methodPLUG-IN SINGLE GROUP
frequency_rating425.0 HERTZ MAXIMUM SINGLE COMPONENT
outside_diameter12.000 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter8.000 INCHES NOMINAL IN
NSN3120-00-432-9070
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 7904-1 · Hama ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-L-46010 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
•
INNER MEMBER WIDTH: 1.8000 INCHES NOMINAL IN
•
OUTER MEMBER WIDTH: 1.6000 INCHES NOMINAL IN
•
BORE DIAMETER: 3.5010 INCHES MINIMUM AND 3.5022 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-L-46010 MIL SPEC SINGLE MATERIAL RESPONSE LUBRICATION
INNER MEMBER WIDTH1.8000 INCHES NOMINAL IN
MATERIALLUBRICANT DRY FILM LUBRICATION
MATERIAL DOCUMENT AND CLASSIFICATIONST-05-501 LEAR SIEGLER INC MFR REF SINGLE MATERIAL RESPONSE OVERALL
OUTER MEMBER WIDTH1.6000 INCHES NOMINAL IN
BORE DIAMETER3.5010 INCHES MINIMUM AND 3.5022 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
1204-1Interchangeable
interchangeable cross-reference
interchangeable
HC4852-1REVGInterchangeable
interchangeable cross-reference
interchangeable
7904-1Interchangeable
interchangeable cross-reference
interchangeable
499-009-030Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7904-1?
7904-1 is a TRANSFORMER,DISCRIMINATOR manufactured by Hama.
What parts can replace 7904-1?
There are 4 known substitutes for 7904-1: 1204-1, HC4852-1REVG, 7904-1 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7904-1?
7904-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-432-9070. 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