A spring-loaded ball engages a track or recesses to create tactile steps.
What it is
A ball detent uses a small ball pressed by a spring against a track or a series of recesses. As parts move, the ball rides over the surface and drops into each recess, creating defined steps or stops. The ball may be steel, ceramic or plastic such as POM, and the track design depends on the brand.
How it feels in your EDC
Ball detents give stepped, textured feedback: a series of small bumps or a firm click into each position. Changing the track, spring strength or ball material can make the feel softer or crisper, denser or more spaced out. They are often combined with magnets, which handle return force while the detent adds texture.
What to look for
Check what the ball and track are made of and whether they can be swapped, since many designs offer several tracks for different feels. Small balls and springs are easy to lose, so open the piece over a tray. Keep the track clean, as grit can make the steps feel rough.
是什么
顶珠定位（Ball Detent）是用弹簧把一颗小珠子压在轨道或一系列凹位上。零件移动时，珠子在表面滚过并落入每个凹位，形成明确的段落或停止点。珠子可能是钢、陶瓷或 POM 等塑料，轨道设计取决于品牌。
上手感受
顶珠带来分段、有纹理的反馈：一连串细小的颗粒感，或每到一个位置就清脆地卡住。更换轨道、弹簧力度或珠子材质，可以让手感更柔和或更清脆、更密集或更疏朗。它常与磁铁结合：磁铁负责回位，顶珠增加质感。
选购要点
确认珠子和轨道的材质以及能否更换，很多设计提供多条轨道对应不同手感。小珠子和弹簧容易丢失，最好在托盘上方拆开。保持轨道清洁，砂粒会让段落感变得发涩。
