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ISTMALL · SAMDUCKSA ARCADE BUTTON CWB 401
A raised dome made for palm play
Bishi Bashi · pop'n music · Come On Baby
5 colors · Pre-installed 200g spring 
CWB 401 · 5 COLORS See all five colors
This animation cycles through the available colors. It does not indicate a color-changing function of the button. LED lamps are sold separately. Before You OrderShape & Size · A large round button with a 98 mm outer top diameter and a raised dome-shaped pressing surface. Standard Spring · Comes with a 200g spring pre-installed inside the button. Check that the standard spring suits your preferred feel. Included Parts · Button body, cover, mounting nut, switch holder, and Gersung V-0303A06 microswitch. Supplied Condition · The nut is fitted to the body, and the microswitch is fitted to the holder. Lighting & Assembly · LED lamp sold separately. Insert the holder with its orientation offset, then rotate it to lock. 01 · CWB 401 
KOREAN ARCADE HERITAGE
Experience built in the arcade,
|
| Top Shape |
CWB 405 · Rectangular CWB 401 · Round with a raised dome |
|---|---|
| Overall Top Dimensions |
CWB 405 · 32 × 50 mm CWB 401 · 98 mm diameter |
| Size Difference at a Glance | The 401's 98 mm outer diameter is 48 mm larger than the 405's 50 mm long side. Check both the panel space it occupies and the spacing between buttons. |
| Typical Uses |
405 · Main playing buttons for rhythm games and other applications 401 · Bishi Bashi, pop'n music, and Come On Baby controllers |
| Before Building or Replacing | Check the outer top diameter, panel mounting hole, panel thickness, nut clearance, and space underneath for the switch and wiring. |
05 · CWB 401
Five Colors for Your Controller
Choose from White, Red, Blue, Green, and Yellow. Assign colors to different functions or match your game's layout and controller design.
White
Red
Blue
Green
Yellow
Color photos are provided as a selection reference.
Actual colors may appear different depending on lighting and screen settings.
06 · CWB 401
Included Parts & Supplied Condition
The standard package includes the body, cover, nut, holder, and Gersung microswitch. Please check which parts are included and which are sold separately.
| Button Body |
One CWB 401 button body in your selected color 200g Bishi Bashi spring pre-installed |
|---|---|
| Button Cover | Round cover for the CWB 401 included |
| Mounting Nut | Included · Supplied fitted to the button body |
| Switch Holder | Included · Holds the LED lamp and microswitch |
| Microswitch |
One Gersung V-0303A06 Supplied fitted to the holder |
| LED Lamp | Not included / Sold separately |
CWB 401 Button Cover
A round cover that fits to the underside of the button is included.
Mounting Nut
Secures the button to the panel. Supplied fitted to the body.
Holder + Gersung Switch
The microswitch is supplied fitted to the holder. An LED lamp is not included.
The nut and switch holder photos show common CWB-series parts. Button input and lighting are separate systems. For illumination, prepare a compatible LED lamp, power supply, and wiring for your setup.
07 · CWB 401
Check the Pre-installed Spring
The CWB 401 is supplied with a 200g Bishi Bashi spring as standard.
200g Bishi Bashi Spring Included
A 200g Bishi Bashi spring is pre-installed inside the button. The spring affects the return action and the feel when pressing and releasing the button.
The standard supplied spring remains 200g even when the button is used in a controller for another game, such as pop'n music. If you prefer a lighter feel, check the standard specification before ordering.
Spring Rating and Switch Force Are Different
200g · Rating of the spring inside the button
OF Max. 60g · Operating force of the Gersung V-0303A06 microswitch alone
These two values cannot simply be added to calculate the operating force of the complete button. Actual feel also depends on the button's construction and assembly.
08 · CWB 401
Switch Holder Assembly
Correct holder orientation and secure attachment are essential for transferring the button's movement to the switch. Check the animation and step-by-step photos before assembly.
Key Steps: Offset Insertion → Rotate to Lock
Insert the holder with its orientation offset, then turn it to lock in place. Do not force it straight in with the white actuator already aligned with the switch's red pin.
01. Insert with the Orientation Offset
Turn the holder so the white actuator beneath the button and the switch's red pin are not directly aligned. Check the fitting position, then push the holder inward.
02. Rotate to Lock
Rotate the holder until the white actuator and red pin align vertically, and lock it in place. Pressing the button should now operate the switch correctly.
03. Check Locking and Return
Check that the holder is secure and the button presses and returns smoothly before connecting the wiring.
Offset the orientation for insertion
Align the actuator and pin after locking
Do not confuse this with the straight-in insertion method used by the Sanwa OBSA series. If the holder does not fit easily, recheck its orientation and any obstruction. Do not force it or twist it by gripping the terminals. Disconnect power before assembly or wiring.
09 · CWB 401
Gersung Microswitch Included
When choosing a replacement switch or wiring parts, check both the standard model number and terminal type.
| Manufacturer / Model | Gersung Engineering / V-0303A06 |
|---|---|
| Actuator | Pin plunger |
| Contact Type | SPST-NO (1a) · Normally open |
| Electrical Rating | 0.3 A / 24 V DC |
| Operating Force | OF Max. 60g · Microswitch only |
| Terminal Type | Type A · Solder or #187 tab |
| Supplied Condition | Included, fitted to the switch holder |
NO means that the contacts are normally open and close when the button is pressed. The electrical rating above applies to the switch; it is not the required voltage for the LED lamp.
Specification reference: Gersung Engineering V-Series Micro Switch Product Information .
10 · CWB 401
Specifications & Installation Checks
For a large button, panel rigidity and clearance underneath are just as important as the layout on top.
| Product | SAMDUCKSA CWB 401 |
|---|---|
| Top Shape | Round · Raised dome |
| Outer Top Diameter | Ø98 mm · Not the mounting hole diameter |
| Colors | White / Red / Blue / Green / Yellow |
| Pre-installed Spring | 200g Bishi Bashi spring |
| Standard Switch | Gersung V-0303A06 |
| Mounting Method | Threaded body with mounting nut |
| Typical Uses | Bishi Bashi, pop'n music, and Come On Baby controllers |
| LED Lamp | Sold separately · Not included |
CWB 401 Dimensional Drawing
Check the outer diameter, dome profile, and underside structure. Dimensions in the drawing are in millimeters. The outer top diameter is Ø98 mm.
Click the drawing to open a larger view in a new window.
The outer top diameter and panel mounting hole diameter are different. Before cutting the panel, check the drawing and the actual mounting structure. Allow space underneath for the holder, switch, and wiring.
Above the Panel
Check the 98 mm outer top diameter and spacing to nearby buttons. Position the button so palm-operated play does not interfere with adjacent components.
Below the Panel
Allow space for the mounting nut, holder, microswitch, and connected wiring.
Before Cutting or Replacing
Check the panel hole, thickness, and mounting structure. Do not size the mounting hole using the outer diameter alone. Confirm the required mounting dimensions on the actual product or with your retailer.
11 · CWB 401
Microswitch Chattering & Contact Bounce
Please distinguish the characteristics of mechanical contacts from persistent input problems during use.
Mechanical Contact Characteristics
When a microswitch changes state, its contacts may briefly make and break contact repeatedly. This is known as chattering or contact bounce. Its behavior can vary with operating speed, load, and contact condition.
Checking Input in Games
Whether brief contact changes register as repeated inputs also depends on the controller board's input processing, including debouncing. Check the holder attachment and wiring as well.
Persistent unintended inputs should not automatically be treated as normal. If repeated inputs, missed inputs, or interruptions while holding the button continue, check holder alignment and terminal contact. If symptoms persist after correct installation, contact your retailer with details of when they occur.
Reference: OMRON Chattering FAQ · FAQE20041 . This is general guidance on mechanical contact switches. The standard switch supplied with this product is made by Gersung.
12 · CWB 401
Appearance of Transparent Parts
Tiny Specks & Fine Hairline Marks
The inside of the clear button top may contain tiny specks or fine hairline scratches arising during production.
Minor manufacturing marks that do not affect normal operation are not considered product defects.
13 · CWB 401
Frequently Asked Questions
Q. What spring is fitted as standard?
A 200g Bishi Bashi spring is pre-installed inside the button. The standard supplied spring remains 200g even when used in a controller for a different game.
Q. Can I use it in Bishi Bashi or pop'n music arcade machines and controllers?
Yes. This is a large round button used in those controllers.
Some custom home controllers are built with different button sizes. Please check the size information before purchasing.
Q. Is an LED lamp included?
No. LED lamps are sold separately. If illumination is required, prepare a compatible lamp, power supply, and wiring.
Q. Should I cut a 98 mm hole in the panel?
No. 98 mm is the outer top diameter. Check the mounting hole and fitting structure separately, and confirm the required dimensions on the actual product or with your retailer before cutting.
Q. What should I do if the holder does not fit easily?
Do not align the white actuator and red pin directly before insertion. Insert the holder with its orientation offset, then rotate it to lock. Do not force it if it catches.
SAMDUCKSA CWB 401
98 mm Diameter · Large Round Dome Button · 5 Colors
200g Bishi Bashi Spring · Gersung V-0303A06 Included
LED Lamp Sold Separately · Offset Holder Insertion, Then Rotate to Lock
