EF-8 Ball Screw Support Unit (Supported end, Round, for shaft ⌀10/12 mm)
EF-8 MOSIONX support unit: Supported end, Round, compatible shaft ⌀10/12 mm, bearing 606ZZ. Original MOSIONX, paired with ball screws. In stock.
Key Specifications
| Series | EF |
| Model | EF-8 |
| Type | Supported end |
| Shape | Round |
| Compatible shaft dia | 10/12 mm |
| Bearing model | 606ZZ |
Dimension Drawing
Drawing data from the original MOSIONX catalog; always use the actual mounting dimensions.
Compatibility
| Compatible shaft dia | Bearing model |
|---|---|
| 10/12 mm | 606ZZ |
Model Code Explanation
EF-8 is a Supported end (Round) support unit. During installation the fixed end should carry the main axial load; the supported end gives auxiliary support and allows slight axial float.
FAQ
Which ball screws are compatible with EF-8?
Compatible with ball screws of shaft ⌀ 10/12 mm mm; match by the catalog dimensional table.
What is the difference between fixed and supported ends?
The fixed end (BK/EK/FK) carries axial load and locates; the supported end (BF/EF/FF) gives auxiliary support and allows slight axial float.
How do I get the 3D / CAD drawing of EF-8?
In the Selector model list, click the CAD/3D link for this support unit to download the original drawing.
Mounting Dimensions & Outline (EF8 · supported end (compact))
Housing & mounting dimensions
| Item | Value (mm) |
|---|---|
| Shaft dia D1 (bearing bore) | 6 |
| Body length A | 52 |
| Mounting hole pitch B | 38 |
| Body width C | 25 |
| E | 26 |
| H1 | 26 |
| Centre height h (±0.02) | 17 |
| Overall height H | 32 |
| Body depth L | 14 |
| Mounting hole ØX | 6.6 |
| Counterbore ØY | 11 |
| Counterbore depth Z | 12 |
| Circlip | C6 |
| Weight (kg) | 0.16 |
Matching screw shaft-end dimensions
| Item | Value (mm) |
|---|---|
| Suitable screw dia | ⌀10,⌀12 |
| D1 | 6 |
| E | 9 |
Dimension codes A / B / C / E / H1 / h / H / L / PCD / Dg6 follow the drawings in chapter G of the MOSIONX 2026 general catalogue; all values in mm, h to ±0.02 mm. Assembly reference: housing bore K7 for the fixed end, H7 for the supported end; coaxiality of the two housings ≤ 0.02 mm; use KM-series precision locknuts to the thread sizes listed above (external 6g / internal 6H). Always confirm against the delivered product.
EF-8 — Assembly & Lock-nut Torque (reference)
The values below are general references for precision lock nuts. Always follow the manufacturer's technical manual; tighten symmetrically and step-by-step.
| Lock nut thread | Reference torque |
|---|---|
| M10 | 18 N·m |
| M12 | 28 N·m |
| M14 | 38 N·m |
| M15 | 46 N·m |
| M16 | 55 N·m |
| M20 | 95 N·m |
| M25 | 180 N·m |
| M32 | 340 N·m |
| M40 | 620 N·m |
For this unit the compatible shaft is 10/12 mm; the fixed / supported lock nut thread is approx. M10 with a recommended reference torque of approx. 18 N·m.
EF-8 — Selection & Load Match
- Structure type: Supported end (Round) — The supported end mainly provides radial location and rotational support, allowing some axial thermal expansion.
- Matching bearing: 606ZZ, matched to the ball screw's rated speed and axial load.
- Compatible shaft 10/12 mm — keep the screw shaft within this unit's range to avoid long overhang and deflection.
- Together with the ball screw and coupling it forms the feed unit; its rigidity directly affects machine positioning accuracy and backlash.
EF-8 — Common Faults & Troubleshooting
| Symptom | Possible cause | Check & remedy |
|---|---|---|
| Bearing noise | poor lube, misalignment, damaged or contaminated bearing | re-align, re-lubricate, replace bearing if needed |
| Axial play | lock nut loose, bearing clearance too large | re-tighten per table, use zero-clearance / preloaded bearing |
| Abnormal heating | over-preload, poor lube, over-speed | adjust preload, improve lube, verify rated speed |
| Housing crack / deformation | uneven mounting face, over-tight bolts, impact | ensure face flatness, tighten to recommended torque symmetrically |
EF-8 — Typical Applications
As the end-support component of a ball-screw feed unit, EF-8 (Supported end · Round) is widely used in CNC machine tools, automation lines, 3D printing / precision measuring equipment, semiconductor packaging and transfer robots where stable axial support and high repeatability are required.
EF-8 — Installation & Maintenance
- Mounting face: keep the housing bottom flat and fully seated on the machine frame — no forced tightening that distorts the housing.
- Alignment: keep screw-to-rail parallelism ≤ 0.02 mm/m to prevent eccentric load and abnormal wear.
- Tightening: tighten the lock nut symmetrically and step-by-step per the table above.
- Lubrication: re-grease the bearing per duty; use the right grade for high speed or clean rooms.
- Protection: in dusty / chip environments add a cover to extend bearing and screw life.
Further Reading: Support Units & Selection Guides
Need to choose shaft diameter, lead and precision grade (C5/C7/C3), or learn about mounting torque, pre-stretch and troubleshooting? We have prepared complete technical guides:
Support Units OverviewSupport Unit Selection & MountingTroubleshooting