# Why Position Preload Feels Stiffer Than Spring Preload

Position preload locks axial stack length through spacers or locknuts, so stiffness stays high until thermal growth fights the stack. Spring preload holds force more steadily as temperature rises but gives a softer feel. Choose by duty: finishing cuts favor position; long thermal cycles often favor springs.

Compare modes in TFL Bearing preload overview. Read spindle bearing preload calculation before changing spacer length.

Shandong TFL Bearing Co., Ltd keeps both methods in one vocabulary for design and shop.