A description such as “25 mm ballscrew” leaves the lead, nut geometry, accuracy, preload, shaft ends and usable travel unresolved. Use the checks below to turn your machine requirements into a complete specification, test the selection against speed and load limits, and compare Coimbatore quotations without paying for an incompatible assembly.
Key takeaways
- Send travel, speed, load, duty cycle and environment data.
- Match diameter and lead to speed, load and service life.
- Select ground or rolled construction with the correct preload and nut.
- Compare quotations using complete mechanical and specification details.
Send the supplier a complete axis specification
A supplier needs the complete axis specification, not just “25 mm ballscrew.” Send the travel, usable stroke, speed, acceleration, axial load, duty cycle, repeatability, mounting orientation, lubrication method and operating environment. This is the core of reliable Hiwin ballscrew specifications in Coimbatore.
1. State the required screw size as diameter × lead, such as 20×5. Lead determines travel per revolution; it is not the nut’s outside diameter. Include maximum linear speed, acceleration and the motor’s available speed and torque.
2. Provide the axial load, load direction, stroke length, speed profile and duty-cycle percentages. Add mounting orientation, lubrication method, operating temperature, contamination and any radial or moment load. Put radial loads on the linear guides, not the ballscrew nut.
3. Specify ground or rolled construction, accuracy grade, required positioning accuracy and repeatability separately. For a rolled screw, name the requested class, commonly C7 or C10, and ask for the manufacturer’s lead-accuracy tolerance over the effective travel.
4. Identify the nut style, preload, shaft length, shaft-end machining and support-bearing arrangement. State whether the axis uses fixed–fixed, fixed–supported or another bearing layout, and send a drawing showing the available machine envelope.
5. Ask the supplier to confirm the complete designation, including diameter, lead, nut, preload, accuracy grade and end machining, against your axis data. A catalogue accuracy grade does not guarantee final positioning accuracy; thermal growth, coupling error and servo tuning still affect the axis.
This information lets the supplier check speed, load, critical-speed margin, buckling, torque and service life before quoting.
Match diameter and lead to speed, load and life
A 20×5 screw has a 20 mm nominal diameter and moves 5 mm per revolution; the lead sets speed, while diameter affects stiffness, buckling resistance and critical speed. Do not select from “25 mm ballscrew” alone: HIWIN ballscrew sizes need the nut style, accuracy grade, preload, usable stroke, shaft-end machining and support arrangement.
Check the selected designation against these figures:
- Calculate screw speed as linear speed × 60 ÷ lead. Compare the resulting rpm with the manufacturer’s critical-speed limit for the unsupported length and bearing arrangement. A long, fast screw can whip even when its static load is low.
- Calculate load torque as axial force × lead ÷ (2π × efficiency). Add acceleration torque, then compare continuous and peak torque with the motor and drive ratings. A smaller lead reduces speed demand but increases motor torque; a larger lead does the reverse.
- Check compressive load against the screw’s buckling rating, especially on vertical or pushing axes. Keep radial and moment loads on the linear guides, not on the nut.
- Use the complete duty cycle—axial load, speed, acceleration, stroke, lubrication, orientation and operating environment—to calculate dynamic life. Static load alone cannot validate the size.
- Confirm that the motor reaches the required rpm without exceeding its speed, current or thermal limits.
For a rolled screw, state C7 or C10 and request the manufacturer’s lead-accuracy tolerance for the effective travel. “Rolled” does not establish positioning performance.
Choose ground or rolled, then set preload and nut style
Choose ground or rolled based on the motion you must control, then specify accuracy, preload and nut geometry separately. A HIWIN ground ballscrew suits axes where positioning accuracy, repeatability, low transmission error or steady torque matters. It costs more and local availability can take longer.
A HIWIN rolled ballscrew in Coimbatore suits less demanding positioning and higher-volume applications, but “rolled” alone does not define lead accuracy.
| Option | Accuracy choice | Preload and nut configuration | Best fit |
|---|---|---|---|
| Ground | State the required HIWIN accuracy grade | Light, medium or heavy preload; single, double or custom nut | Precision positioning, interpolation and repeatable motion |
| Rolled | State C7 or C10 when applicable and request lead-accuracy tolerance over effective travel | Select preload and single or double nut from the series drawing | General automation, transfer axes and cost-sensitive machines |
Preload removes axial play and raises rigidity; it does not automatically improve accuracy. Excessive preload adds friction, heat and motor torque, so match it to cutting force, acceleration and duty cycle rather than choosing the highest class.
Put these details on the enquiry:
- Exact HIWIN series and complete ordering code, not “25 mm ballscrew”
- Nominal diameter, lead, usable stroke and required accuracy grade
- Preload class, nut type, nut mounting dimensions and lubrication arrangement
- Shaft length, end machining, support-bearing arrangement and operating orientation
- For rolled screws, the manufacturer’s lead-accuracy tolerance across the requested travel
Ask for the current datasheet revision, dimensional drawing and inspection documentation before approval.
Verify the complete mechanical interface before ordering
A “25 mm ballscrew” is not enough to confirm fit. HIWIN ballscrew sizes are expressed as nominal diameter × lead, such as 20×5, but the purchasable assembly also needs the exact series, nut style, preload, accuracy grade, usable stroke, shaft length and end machining.
- Obtain the supplier’s dimensional drawing for the exact ordering code. Compare the screw diameter, nut outside diameter, nut length, flange bolt circle, mounting-hole size and flange orientation with your nut housing or saddle.
- Measure the housing bore, shoulder location, retaining-thread arrangement and available assembly access. A nut can have the correct lead yet fail to enter the housing, reach its shoulder or align with the mounting holes.
- Match the support arrangement to the shaft ends. Confirm whether the axis uses fixed-free, fixed-supported or fixed-fixed supports, then check bearing bore, seat diameter, shoulder length, locknut thread and spacer requirements against the BK, BF or equivalent support drawings.
- Lay out the full machine envelope at both travel limits. Include nut length, shaft overhang, coupling length, motor space, protective bellows, hard stops and tool or fixture clearance. A usable stroke that fits the calculation can still crash into a bearing block.
Ask for a signed dimensional drawing and mark every interface on your assembly drawing before releasing the order. Confirm that the required stroke excludes the nut’s safety margin and that shaft-end machining matches the coupling or pulley bore; do not accept “standard ends” as a specification.
Compare Coimbatore quotations by specification, not headline price
A low quotation is not comparable until the supplier identifies the exact HIWIN series and full ordering code. For hiwin ballscrew specifications in coimbatore, request a written offer stating diameter, lead, usable stroke, nut style, preload, accuracy grade, shaft-end machining, support-bearing arrangement and country of manufacture.
| Quotation item | What to compare | What to reject |
|---|---|---|
| Accuracy | C7 or C10, plus lead-accuracy tolerance over the requested effective travel | “Rolled” with no tolerance |
| Product identity | Exact series, nut code, full ordering code and datasheet revision | “HIWIN 25 mm ballscrew” |
| Fit and evidence | Dimensional drawing, end machining, inspection record and traceable packing label | Unlabelled stock or catalogue-only claims |
| Commercial cover | Warranty terms, delivery condition and included support units or nut housing | Unstated exclusions |
Before releasing the purchase order, compare the code on the quotation with the current HIWIN drawing. Check the nut length and mounting dimensions, shaft length, threaded ends, keyways, preload marking and accuracy class against the drawing and inspection document.
Do not treat a higher accuracy grade as higher preload; preload changes axial play, rigidity, friction, heat and motor torque.
Ask a local supplier to send photographs of the sealed label showing the part code, batch or lot reference and country of manufacture. SSB INDUSTRIAL SOLUTIONS can help cross-check the screw, nut housing and support-unit interfaces, but you should record every accepted specification on the purchase order.
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Frequently asked questions
What axis information should you send before ordering a Hiwin ballscrew?
Send travel, usable stroke, speed, acceleration, axial load, duty cycle, repeatability, mounting orientation, lubrication method and operating environment.
How do you choose Hiwin ballscrew diameter and lead?
Match diameter and lead to required speed, axial load, acceleration, critical speed and target service life.
Should you choose a Hiwin ground or rolled ballscrew?
Choose between ground and rolled construction after comparing required accuracy, repeatability, speed, cost and application duty.
What should you verify before ordering a complete ballscrew assembly?
Verify shaft length, usable travel, nut dimensions, mounting interfaces, end machining, preload, lubrication access and compatibility with the machine.
How should you compare Hiwin ballscrew quotations in Coimbatore?
Compare quotations against the same diameter, lead, accuracy class, nut style, preload, end machining, accessories, delivery terms and documentation.
Related products
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