PartsTable
Technical Data Sheet
3904 ✓ Verified by PartsTable
Braun · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

<b>Triple Action Free Float System</b><br>With three fully adaptive cutting elements the floating head adapts automatically to facial contours and shave short and long hairs in every stroke.<br><br><b>Smart Foil™</b><br>Through its unique foil patterns the Smart Foil™ captures hairs growing in different directions.<br><br><b>3-Stage Cutting System</b><br>With twin foils that shave off stubbles and an integrated cutter that shortens longer hairs Braun shaves progressively closer in 3 stages.<br><br><b>Washable</b><br>Fully washable under running tap water – for easy cleaning.<br><br><b>Clean & Renew™ System</b><br>At the touch of a button automatically cleans, lubricates and charges the shaver to keep it feeling like new every day. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-020-0203, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
3904
NSN: 5331-00-020-0203
FSC: 5331 — O-RING
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
width6.000 INCHES NOMINAL IN
length11.000 INCHES NOMINAL IN
materialRUBBER BUTADIENE NITRILE
duty_typeCONTINUOUS
thickness0.812 INCHES NOMINAL IN
design_typeRIGID-METAL
capsule_typeHARD
thread_class2A SINGLE MOUNTING FACILITY A
coil_quantity1
overall_width1.430 INCHES NOMINAL IN
terminal_typeSCREW
accessory_typeVALVE
NSN5331-00-020-0203
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3904 MFR: Braun ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 35
3904Interchangeable
interchangeable cross-reference
interchangeable
1KK528Interchangeable
interchangeable cross-reference
interchangeable
AS568A-904MILP2 5732Interchangeable
interchangeable cross-reference
interchangeable
3-4 N304-75Interchangeable
interchangeable cross-reference
interchangeable
AS3208-04Interchangeable
interchangeable cross-reference
interchangeable
Z00.N7423510020Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3904?
3904 is a RELAY,ELECTROMAGNETIC manufactured by Braun.
What parts can replace 3904?
There are 35 known substitutes for 3904: 3904, 1KK528, AS568A-904MILP2 5732 and 32 more. Substitute compatibility should be verified for your specific system.
Is 3904 still available?
3904 is currently cancelled.
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