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12C21 — SWITCH,CODE INDICATING WHEEL

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

12C21: SWITCH,CODE INDICATING WHEEL.

The SWITCH,CODE INDICATING WHEEL is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, cup_width: 1.5000 INCHES NOMINAL IN, cone_width: 1.9000 INCHES NOMINAL IN, thread_class: 2B SINGLE MOUNTING FACILITY, actuator_type: PUSH BUTTON SINGLE ACTUATOR, bore_diameter: 3.3750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-101-4196, 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→ 12C21
NSN: 3110-00-101-4196
NIINs: 001014196, 001345715
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 24047 — COOPER INDUSTRIES INC DBA COOPER TOOLS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width1.5000 INCHES NOMINAL IN
cone_width1.9000 INCHES NOMINAL IN
thread_class2B SINGLE MOUNTING FACILITY
actuator_typePUSH BUTTON SINGLE ACTUATOR
bore_diameter3.3750 INCHES NOMINAL IN
overall_width1.8750 INCHES NOMINAL IN
overall_height2.330 INCHES NOMINAL IN
overall_length0.480 INCHES NOMINAL IN
standout_width0.3750 INCHES NOMINAL IN
mounting_methodBRACKET(S) AND THREADED HOLE(S) SINGLE MOUNTING FACILITY
special_featuresW/THREE DIODES
NSN3110-00-101-4196
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 12C21 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CUP WIDTH: 1.5000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
OVERALL OUTSIDE DIAMETER: 6.3750 INCHES NOMINAL IN
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
•
STANDOUT WIDTH: 0.3750 INCHES NOMINAL IN
•
CONE WIDTH: 1.9000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CUP WIDTH1.5000 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH1.8750 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER6.3750 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
STANDOUT WIDTH0.3750 INCHES NOMINAL IN
CONE WIDTH1.9000 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER3.3750 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 5
ASD1506Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
758-752Reference document
Same NSN cross-reference
Reference document — Secondary reference
25Z259D25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
8083552Reference document
Same NSN cross-reference
Reference document — Secondary reference
A26746Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12C21?
12C21 is a SWITCH,CODE INDICATING WHEEL. It is classified as a MRO (MRO_GENERAL).
What parts can replace 12C21?
There are 5 known substitutes for 12C21: ASD1506, 758-752, 25Z259D25 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12C21?
12C21 is cataloged in the U.S. Government catalog under NSN 3110-00-101-4196. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.