The difference starts from manufacturing and accuracy control
Rolled ball screws are formed by rolling and usually have better cost and delivery. Ground ball screws use grinding to achieve higher accuracy and more stable geometry for demanding positioning axes.
Rolled screws fit many economical projects
CNC routers, packing machinery, general automation, distributor stock, and repair replacement often use rolled ball screws. If C7 or similar accuracy is acceptable, rolled screws are often the practical choice.
Ground screws fit demanding axes
When the machine requires C5, low backlash, stable preload, higher positioning accuracy, or inspection reports, evaluate a ground ball screw. Drawings, accuracy grade, and inspection method should be clearer.
- State target accuracy grade or machine requirement.
- Confirm preload, low backlash, or inspection report needs.
- Provide travel, speed, load, and environment.
- For replacement, send old-part photos and dimensions.
Typical buyer situations
This topic usually appears in distributor stocking, repair replacement, machine retrofit, automation projects, and drawing-based purchasing. If a buyer sends only one model number, the supplier cannot judge the real use, packing risk, or whether machining upgrades are needed.
Details to confirm before quotation
To reduce repeated questions, the RFQ should cover product specification, use case, and delivery expectations together. The following points can be copied into the RFQ form or email.
- Purchase purpose: distributor stock, repair replacement, machine project, or sample testing.
- Specification: diameter, lead, overall length, thread length, nut type, and quantity.
- Machining: cut-to-length, end machining, and whether BK/BF, FK/FF, EK/EF, or other supports must be matched.
- Delivery: target quantity, expected lead time, packing, labels, shipping method, and whether shipment photos are required.
Common mistakes
A common mistake is asking only for unit price without application, quantity, or packing details. Another is sending photos without dimensions. This turns quotation into guesswork and can create errors in end machining, nut matching, or long-part shipping.
Next step
If the specification is clear, submit an RFQ directly. If the model or accuracy grade is still uncertain, describe the machine use and old part details so the supplier can recommend a standard part, bar stock, cut-to-length, or end machining route.
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