Manufacturer Seimitsu is well known for the PS series pushbutton, whose microswitch differentiates itself by requiring just a bit more force to actuate. The MM9-3 spring adds a bit of extra tension to Seimitsu's 30mm pushbutton series. This is desirable to some who appreciate a slightly more deliberate input force and a bit less sensitivity than Sanwa's SW-68 offers.
Adds .15N for Total of 1.13N (0.2548 LBF)
By default, Seimitsu microswitch requires 1.0N or 0.2 LBF (pounds force) to each button. The MM9-3 adds .15N, for a total of 0.258 LBF. The result is a light but firm button input requirement and quicker return to neutral.
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Seimitsu
Seimitsu PS Button Spring MM9-3 - 0.15N (PS-14-Dx/K/PS-15)
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Best Seimitsu Springs
Amazing for if you have wrist pain using heavier Seimitsu springs! They snap back very nicely, so extra inputs never happen, yet they're light enough to mash easily with. Feels amazing for those tight combos! Jacob on Jul 16th 2026