The preloaded version of the smallest PRT-04 slewing ring igus® makes. Same compact footprint as the standard Micro, with built-in preload that increases torsional resistance and removes play — producing a consistent, premium feel for manual rotation that’s especially valued in instruments, dials, and adjustment knobs. Aluminum rings paired with wear-resistant iglide® J sliding elements deliver smooth, grease-free dry operation. Fully maintenance-free.
When to use it: Ultra-compact rotary applications where manual positioning feel matters as much as size.
When not to use it: When the application is power-driven and free rotation is preferred (use the standard Micro for lower torque and faster motion), or when standard PRT-04 dimensions fit and a preloaded variant in that size range delivers more load capacity.
Application areas: Optical instrument adjustment knobs, scientific equipment dials, miniaturized gimbals, precision medical devices, hand-positioned tooling, and any compact rotary mechanism where the operator’s tactile experience is part of the design.
