Sanwa OBS-24B Screw In Arcade Button

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Product Code: OBS-24B

The Sanwa OBS-24B button is very similar to the Sanwa OBSN-24 button. The main difference is that this button has a Sanwa OBS-M-1 (OMRON) microswitch and holder fitted to the body of the button. The terminals on the OBS-M-1 (OMRON) microswitch are 4.8mm, compared to the Sanwa OBSN-24 button, which has built in 2.8mm terminals. This is a screw in type button. This button has a plastic fixing ring, once mounted into a 24mm mounting hole, this will keep the button in place. This button is primarily used as a start button on Japanese arcade machines or fight sticks. The use of the OBS-24B button is not just limited to fight sticks or arcade machines though. It is also a good choice for various commercial or academic projects that require quality and reliability and is suitable for DJ Midi Controller projects.

This button is available in a range of colours, the same colours as the popular Sanwa OBSN-24 button.

Colour Options:
Blue, Green, Orange, Red, Yellow.

This button is ideal for those customers who have an existing machine or project that already has 4.8mm wiring installed and they don’t want to have to change the wiring for the usual 2.8mm that Sanwa buttons usually require. This button combines the best of both worlds! You can use a high quality Sanwa branded button, with the convenience of being able to use popular 4.8mm crimped wires on a standard 3 pronged, high quality Omron microswitch.

The OBS-24B button requires a 24mm mounting hole and a maximum mounting depth of up to 4mm. These are usually mounted in thin metal material or control panels. The breadth of the microswitch terminals is 4.8mm or .187 inches. The overall diameter of the button is 27.2mm.

Please note:
When mounting in your control panel or project case, you will need to allow more mounting depth than a Sanwa OBSN-24 button, due to the longer microswitch housing attached. Please see below for button dimensions.

We also sell a LARGER 30mm button that is a perfect match for the OBS-24B, which can be used as the main action buttons on a fight stick or arcade machine. These also have the Sanwa OBS-M-1 (OMRON) microswitch and housing fitted with 4.8mm terminals. To order the OBS-30B buttons please see here: Sanwa OBS 30B Arcade Button

Wiring Info:
This button requires 4.8mm crimped wires for connection.
1 wire for ground connection (CO) and 1 wire for signal connection (NO)

Button Dimensions:
Mounting hole required: 24mm
Overall Diameter of button across plunger: 27.2mm
Maximum depth of button from top of plunger to bottom of microswitch: 47mm

OBS-M-1 Microswitch Specification:
Omron Microswitch
10A 1/2HP 125 250VAC
0.6A 125VDC 0.3A 250VDC 


  • 5
    A most satifying button!

    Posted by Doak on 3rd Nov 2021

    These buttons have a very satisfyinh click to them, I can't go back to linear style buttons or other Japanese buttons after using these. The concave plungers sold by focusattack are compatible with these buttons.

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