High-precision micro planetary roller screws for very compact spaces.
Select this family when the actuator envelope is the primary constraint but the design still needs roller-screw load density, long fatigue life, and controlled axial play. It is usually the first architecture to evaluate for fingers, surgical instruments, micro-positioning axes, and compact lab automation modules.
Start with screw diameter, usable stroke, nut style, bearing span, and shaft-end interface instead of a model number alone.
Risk if missed: A nominally correct screw can fail packaging review if the nut, bearing stack, or machined ends are not included in the envelope.
Define whether the priority is minimum lost motion, low running torque, or low heat generation under short-stroke cycling.
Risk if missed: Over-preload in a very small package can raise heat and reduce life before the mechanical load limit is reached.
For medical, lab, or optical equipment, specify lubricant restrictions, particle limits, and packaging requirements at RFQ stage.
Risk if missed: Late lubricant changes can invalidate life testing and force a second sample build.
| Metric | Typical Range | Why It Matters |
|---|---|---|
| Lead Accuracy | G3 (0.008mm/300mm) | Critical for micro-positioning axes and smooth short-stroke motion. |
| Dynamic Load Rating | Higher load density than ball screws in comparable envelopes | Supports actuator downsizing when contact stress, life, and heat are validated against the buyer duty cycle. |
| Model | Nominal Dia (d0, mm) | Lead (mm) | Dynamic Load (Ca, kN) | Static Load (C0a, kN) | Max Speed (mm/s) | Precision |
|---|---|---|---|---|---|---|
| Micro-RV 1.5 | 1.5 | 0.5 | 0.8 | 1.2 | 100 | G3 / G5 |
| Micro-RV 3.5x1 | 3.5 | 1.0 | 3.0 | 4.8 | 200 | G3 / G5 |
| Micro-RV 4x1 | 4.0 | 1.0 | 3.5 | 5.5 | 220 | G3 / G5 |
| Mini-RV 5x1 | 5.0 | 1.0 | 4.0 | 4.8 | 250 | G3 / G5 |
| Mini-RV 5x2 | 5.0 | 2.0 | 4.0 | 4.8 | 300 | G3 / G5 |
| Mini-RV 6x2 | 6.0 | 2.0 | 6.5 | 8.2 | 350 | G1 / G3 / G5 |
| Mini-RV 8x2 | 8.0 | 2.0 | 12.5 | 18.0 | 400 | G1 / G3 / G5 |
| Mini-RV 12x4 | 12.0 | 4.0 | 25.0 | 45.0 | 500 | G1 / G3 / G5 |
| Capability | Evidence | Buyer Value |
|---|---|---|
| Micro thread grinding and finishing | Lead accuracy chart, surface roughness record, and thread form inspection for the selected diameter and lead. | Confirms the supplier can hold motion smoothness on small-diameter geometry rather than only quote a catalog size. |
| 100Cr6 / GCr15 material control | Material certificate, hardness report, heat-treatment lot, and incoming material traceability. | Reduces the risk of hidden material substitution in high-cycle or impact-sensitive programs. |
| Small-batch repeatability | First-article inspection, preload torque window, and dimensional report per prototype lot. | Lets engineering compare samples against the same criteria that procurement will later use for repeat orders. |
Step 1
Architecture recommendation with diameter, lead, nut style, shaft-end machining, and bearing support notes.
Acceptance: Engineering agrees that the screw envelope and interfaces fit the actuator CAD.
Step 2
Sample set with material certificate, lead inspection, backlash or axial-play report, and preload torque result.
Acceptance: Measured motion, torque, and fit match the buyer acceptance checklist.
Step 3
Controlled lot with heat-treatment record, AQL or 100% inspection plan, and packaging definition.
Acceptance: Prototype results repeat across parts before annual-volume pricing is frozen.
Yes. Shaft-end machining can follow your bearing and motor interface drawings when geometry and tolerances are confirmed.
Yes. We usually freeze the thread geometry and inspection method during prototypes, then stabilize material lots, heat treatment, and preload torque windows for repeat orders.
Inquiry Email
Please include screw type, diameter, lead, stroke, load, drawings, STEP files, and quantity timeline.
NDA signing supported prior to drawing uploads.
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