Categories / Screws (ball / planetary roller)
Screws (ball / planetary roller)
Screws convert rotation into linear motion, used in linear leg and arm joints and in dexterous fingers. Ball screws are efficient; planetary roller screws carry higher loads and last longer.
High-end ball screws in China have long depended on imports. Volume production of planetary roller screws only began in the past two years.
The barrier is thread grinding, heat treatment and metrology: lead error, coaxiality and preload consistency.
Basis: Industry-structure assessment (Tier C, our own judgement); contains no hard numbers.
Where the barrier sits
- Thread grinding machines and a temperature-controlled shop: the physical precondition for accuracy
- Distortion control after heat treatment
- Batch consistency of lead error and coaxiality
- Life test bench: owning one is what allows a life claim to be made
Price and lead time
Price band pending. Must state: accuracy grade (C0 / C3 / C5), lead, length, whether nut and end machining are included, and order quantity band.
| Data sheet | Status | What the basis must cover |
|---|---|---|
| Accuracy grade comparison | Pending | Lead error / coaxiality / axial clearance |
| Cost breakdown | Pending | Material / grinding / heat treatment / nut / inspection |
| Lead-time distribution | Pending | Standard, custom and batch as three bands |
Who makes it
| Company | Listed / code | Field completeness |
|---|---|---|
| Wuzhou Xinchun (XCC) Xinchang, Zhejiang · Eastern Zhejiang | SSE 603667 | 4 / 13 |
| Best Precision Wuxi, Jiangsu · Southern Jiangsu | SZSE ChiNext 300580 | 4 / 13 |
Ranking follows field completeness and source tier, not payment. Open any company to see how far each of the thirteen fields has been verified.