Rollvis RVD differential planetary roller screws use two nuts with slightly different leads preloaded against each other via an adjusting nut, delivering high rigidity and near-zero axial play (≤0.02 mm). With no recirculating parts they run quietly at high speed, at 80-95% efficiency. Shaft diameters 6.35-32 mm, leads 0.525-10 mm, dynamic ratings 21.6-616 kN, static 39.7-1140 kN, speeds up to 8000 rpm, 6-12 roller circuits, standard lengths 100-280 mm up to 2500 mm max, with hollow-shaft and through-shaft options for servo cylinders and humanoid linear joints.
Rollvis BU support bearing units are engineered for the high-speed, high-acceleration duty of planetary roller screws: fixed-end BUC units use two deep-groove ball bearings for bidirectional axial loads, while floating-end BUM units combine a cylindrical roller with a deep-groove ball bearing to compensate thermal growth. Bore sizes 8-32 mm, load ratings up to 100 kN, grease nipples standard with optional oil ports, four-screw mounting, keyway and adjustable radial/axial play options - the matching support hardware for servo cylinders and humanoid linear actuators.
Rollvis (Switzerland) RVR recirculating planetary roller screws achieve 1-2 micron positioning accuracy and very high repeatability with leads as small as 0.25 mm/rev; shaft diameters 8-125 mm, leads 0.25-5 mm and dynamic load ratings 7.3-986 kN in a smaller nut diameter. All-metal construction with precision-ground nuts, rollers and shafts; low input torque to drive and hold loads with back-drive resistance and very high rigidity, ideal for precision positioning, telescopes, downhole tools and grinding machines.
Rollvis (Switzerland) RVI inverted planetary roller screws keep the roller array inside the nut tube while a smooth screw shaft extends outward, delivering precise linear motion in a compact, small-lead, lightweight package; shaft diameters 8-100 mm, leads 1-16 mm, timing rings built into the shaft and a highly customizable nut that can act as a push tube, cutting actuator part count and energy use. High load rating and long service life suit robotic arm assemblies, spot welding and sheet-metal brake presses.
TBI Motion (Taiwan) rolled ball screws are thread-rolled for smoother operation and cost efficiency, covering Ø6-32 mm shafts with 1-64 mm leads, ball Ø0.8-6.35 mm, accuracy C10/C7/C5 (e300 = 50 µm at C7), standard shaft lengths 1000-6000 mm; nuts span K/V/U/Y/YA/BSH/SQ types with P0 preload, widely used in automation, robot transfer axes and AGVs.
Haydon Kerk Pittman (AMETEK, USA) Kerk WDG is a flanged anti-backlash self-lubricating nut for Ø3/16-1/2 in (4-13 mm) lead screws: dynamic load 4.5-34 kg (10-75 lbf), drag torque 0.03-0.06 Nm (4-9 oz-in), leads 0.5-12.7 mm with efficiency to 86% and left-hand options on selected sizes; the flange mount eases integration in medical devices, 3D printing and optics precision linear drives.
TBI Motion SCI/SCNI precision ground ball screw series covers shaft diameters Ø16-80 mm with leads 4-10 mm; dynamic load rating up to 7346 kgf, static up to 31953 kgf and axial stiffness up to 109 kgf/μm; SCNI uses longer nuts for higher load capacity with dual-circuit recirculation for smooth running - built for machine tools, injection molding and heavy robot axes.
TBI Motion BSH precision ground ball screw series: shaft diameters Ø8-25 mm with leads 2-10 mm; dynamic load rating up to 2954 kgf, static up to 7295 kgf and axial stiffness up to 41 kgf/μm; external circulation for Ø12 and below, internal circulation for Ø14 and above giving compact, quiet nuts - suited to machine-tool axes, robot travel axes and automation.
TBI Motion (Taiwan) SFK is a precision ground miniature ball screw series: shaft diameters Ø4-25 mm with leads 1-5 mm including ultra-small Ø4/Ø6 sizes; dynamic load rating up to 957 kgf, static up to 2381 kgf, axial stiffness up to 48 kgf/μm and nut ODs from only Ø10 mm, with left-hand helix options on selected sizes - compact and precise for small robot joints, semiconductor and medical equipment.
Haydon Kerk Pittman (AMETEK, USA) Kerk lead screws span 2-24 mm (5/64-15/16 in) diameters with leads of 0.3-92 mm, pairable with ZBX/ZBA/ZBM/KHD/WDG/NTB/VHD/BFW anti-backlash and self-lubricating nuts up to 2,224 N (500 lbf) dynamic load; maintenance-free engineered-plastic nuts run quiet and are widely used in medical devices, optics, 3D printing and precision linear drives as a low-cost small linear-joint solution.
August Steinmeyer (Germany) 1412 miniature ball screws carry a single nut with integral mounting flange (flange OD Ø15-35 mm) for direct screw fixing to the load or carriage - reliable locating, easy assembly, backlash-free running at accuracy class P; the 59-model range spans Ø3-16 mm nominal diameters and 0.5-2.5 mm leads with dynamic capacities 0.09-2.9 kN, static 0.09-4.9 kN, ball diameters 0.6-1.5 mm and nominal strokes to 450 mm for medical, semiconductor and humanoid micro drives.
August Steinmeyer (Germany) 1214 miniature ball screws feature a cylindrical nut ground to h6 tolerance for press-fit or locating-ring installation into housing bores - compact, backlash-free and rated accuracy class P; the 59-model range spans Ø3-16 mm nominal diameters and 0.5-2.5 mm leads with dynamic capacities 0.09-2.9 kN, static 0.09-4.9 kN, ball diameters 0.6-1.5 mm and nominal strokes to 450 mm, a compact choice for space-constrained medical, semiconductor and humanoid micro linear drives.
