FK FF Ball Screw End Support Units for Stable Ball Screw Installation
DLY FK FF Ball Screw End Support is used to support both ends of a ball screw shaft in precision linear motion systems. The FK unit is normally used as the fixed side support for axial positioning, while the FF unit is used as the floated side support to support the opposite end of the screw shaft.
This support pair is commonly used with ball screws in CNC machines, automation modules, laser equipment, packaging machinery and precision feed systems. For correct selection, the support unit should match the ball screw diameter, shaft end machining, bearing seat diameter, lock nut thread and installation space.
FK/FF support units are usually selected as a fixed-side and floated-side pair for one ball screw assembly.
FK Fixed Side and FF Floated Side: How They Work Together
A ball screw system normally needs one fixed end and one floated end. The fixed side controls the axial position of the screw shaft, while the floated side supports the opposite end and allows slight axial movement caused by installation tolerance or thermal expansion. This structure helps reduce unnecessary stress on the ball screw shaft during operation.
| Item | FK Fixed Side Support | FF Floated Side Support |
|---|---|---|
| Main Function | Holds the screw shaft position and controls axial movement. | Supports the opposite end while allowing slight axial movement. |
| Installation Position | Motor side or main positioning side of the ball screw. | Opposite end of the ball screw shaft. |
| Selection Focus | Shaft shoulder, bearing seat, lock nut thread and mounting accuracy. | Bearing bore, shaft end fit and axial freedom. |
| Buyer Checkpoint | Must match the machined fixed end of the screw shaft. | Must match the floated end diameter and support-side machining. |
Product Structure and Supplied Components
The FK/FF support set includes the support housing and related accessories for ball screw end installation. The final configuration should be confirmed according to the screw end drawing and the selected support size.
| Component | Function | Selection Note |
|---|---|---|
| FK fixed end support | Supports the fixed side and helps maintain axial positioning. | Confirm shaft shoulder, bearing fit and lock nut thread. |
| FF floated side support | Supports the opposite end of the ball screw shaft. | Confirm bearing bore and floated-end machining. |
| Locking nut | Used on the fixed side to secure the shaft end assembly. | Thread size must match the machined screw end. |
| Snap ring | Used for bearing or component retention where applicable. | Confirm according to support unit model and assembly drawing. |
FK Fixed Side Support Unit Parameters
| Type | d1 | L | H | F | E | Dg6 | A | PCD | B | L1 | T1 | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| FK 5 | 5 | 16.5 | 6 | 10.5 | 18.5 | 20 | 34 | 26 | 26 | 5.5 | 3.5 | 3.4 | 6.5 | 4 |
| FK 6 | 6 | 20 | 7 | 13 | 22 | 22 | 36 | 28 | 28 | 5.5 | 3.5 | 3.4 | 6.5 | 4 |
| FK 8 | 8 | 23 | 9 | 14 | 26 | 28 | 43 | 35 | 35 | 7 | 4 | 3.4 | 6.5 | 4 |
| FK 10 | 10 | 27 | 10 | 17 | 29.5 | 34 | 52 | 42 | 42 | 7.5 | 5 | 4.5 | 8 | 4 |
| FK 12 | 12 | 27 | 10 | 17 | 29.5 | 36 | 54 | 44 | 44 | 7.5 | 5 | 4.5 | 8 | 4 |
| FK 15 | 15 | 32 | 15 | 17 | 36 | 40 | 63 | 50 | 52 | 10 | 6 | 5.5 | 9.5 | 6 |
| FK 17 | 17 | 45 | 22 | 23 | 47 | 50 | 77 | 62 | 61 | 11 | 9 | 6.6 | 11 | 10 |
| FK 20 | 20 | 52 | 22 | 30 | 50 | 57 | 85 | 70 | 68 | 8 | 10 | 6.6 | 11 | 10 |
| FK 25 | 25 | 57 | 27 | 30 | 60 | 63 | 98 | 80 | 79 | 13 | 10 | 9 | 15 | 13 |
| FK 30 | 30 | 62 | 30 | 32 | 61 | 75 | 117 | 95 | 93 | 11 | 12 | 11 | 17.5 | 15 |
FF Floated Side Support Unit Parameters
The FF support unit is selected for the floated end of the ball screw shaft. Unit: mm.
| Type | d1 | L | H | F | Dg6 | A | PCD | B | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FF 6 | 6 | 10 | 6 | 4 | 22 | 36 | 28 | 28 | 3.4 | 6.5 | 4 |
| FF 10 | 8 | 12 | 7 | 5 | 28 | 43 | 35 | 35 | 3.4 | 6.5 | 4 |
| FF 12 | 10 | 15 | 7 | 8 | 34 | 52 | 42 | 42 | 4.5 | 8 | 4 |
| FF 15 | 15 | 17 | 9 | 8 | 40 | 63 | 50 | 52 | 5.5 | 9.5 | 5.5 |
| FF 17 | 17 | 20 | 11 | 9 | 50 | 77 | 62 | 61 | 6.6 | 11 | 6.5 |
| FF 20 | 20 | 20 | 11 | 9 | 57 | 85 | 70 | 68 | 6.6 | 11 | 6.5 |
| FF 25 | 25 | 24 | 14 | 10 | 63 | 98 | 80 | 79 | 9 | 14 | 8.5 |
| FF 30 | 30 | 27 | 18 | 9 | 75 | 117 | 95 | 93 | 11 | 17.5 | 11 |
FK FF Ball Screw End Support Size Overview
For replacement or OEM assembly, buyers can compare the support model, mounting hole distance and overall dimensions before confirming the final drawing.
Parameters to Confirm Before Ordering
FK FF end supports must match the machined end of the ball screw shaft. Before ordering, it is better to confirm the support model together with the screw diameter, bearing seat size, shaft end drawing and installation layout.
| Parameter | Why It Matters | What Buyers Should Provide |
|---|---|---|
| Ball screw diameter | Affects support model and bearing bore selection. | Screw diameter, such as 12mm, 16mm, 20mm, 25mm or 32mm. |
| Shaft end machining | The support must fit the machined shaft shoulder, bearing seat and thread. | Drawing or dimensions of both screw ends. |
| Fixed / floated side | Wrong side selection may cause axial stress or poor positioning. | Motor side position and opposite end layout. |
| Mounting hole pattern | Must match the machine plate or bracket. | Mounting hole distance, screw size and available installation space. |
| Operating requirement | Speed, load and travel length affect the support selection. | Machine type, travel length, speed and load condition. |
Ball Screw End Machining Matching
When FK FF supports are ordered together with a ball screw, DLY can help confirm whether the support unit matches the screw end machining. This is especially important for replacement parts, OEM drawings and customized ball screw assemblies.
Typical Applications
FK FF ball screw end supports are suitable for compact flange-mounted ball screw systems where stable screw alignment and reliable end support are required.
| Application | Why FK/FF Is Used |
|---|---|
| CNC machines | Supports the ball screw shaft for stable feed movement and accurate axis positioning. |
| Linear modules | Compact flange structure fits integrated ball screw module layouts. |
| Laser and engraving equipment | Helps maintain smooth screw rotation and stable positioning during repeated motion. |
| Packaging and automation equipment | Suitable for repeat feed, lifting, pushing and positioning mechanisms. |
Installation Notes for FK FF Ball Screw End Support
A ball screw end support does not work alone. Its performance depends on shaft end machining accuracy, mounting surface flatness, coupling alignment and bearing assembly condition. Incorrect installation may cause noise, heating, vibration or reduced positioning stability.
FK FF vs. BK BF and EK EF Ball Screw End Supports
Ball screw end support models are selected according to installation space, mounting method, load requirement and shaft end design. FK FF is often selected when a flange-type support structure is preferred and the machine requires compact and accurate end support.
| Support Type | Typical Structure | Common Selection Situation |
|---|---|---|
| FK / FF | Flange-type fixed and floated support. | Compact machines, flange mounting and precision motion modules. |
| BK / BF | Block-type fixed and floated support. | Base mounting, CNC machine axes and general ball screw systems. |
| EK / EF | Compact support structure for smaller ball screw systems. | Small CNC machines, light automation and limited installation space. |
Related Ball Screw Assembly Products
DLY can help confirm ball screws, ball nuts, end supports and couplings together according to your drawing or machine requirement.
Ball Screw + Support Unit Matching
Send your ball screw diameter, lead, shaft end drawing and support model. DLY can help check the matching set before quotation.
View Ball ScrewsAbout DLY Ball Screw Support Supply
Zhejiang DLY Automation supplies ball screws, ball nuts, support units, couplings and linear guideway components for CNC machines, automation equipment and precision motion systems. For FK/FF ball screw end supports, DLY can help buyers confirm the correct support pair according to ball screw diameter, shaft end machining and installation drawing.
FAQ About FK FF Ball Screw End Support
Q1: What is the difference between FK and FF ball screw support?
FK is normally used as the fixed side support to control the axial position of the ball screw. FF is used as the floated side support to support the opposite end while allowing slight axial movement.
Q2: Can FK FF supports be used with any ball screw?
They must match the ball screw shaft end machining, diameter, bearing fit and mounting space. A shaft end drawing is recommended before ordering.
Q3: Can DLY supply FK FF support units together with ball screws?
Yes. DLY can help confirm ball screws, ball nuts, FK/FF support units and couplings together according to your drawing or machine requirement.
Q4: What information should I send for quotation?
Please send the ball screw diameter, lead, support model, quantity, shaft end drawing, machine application and whether you need FK and FF as a set.
Q5: Can I order FK support and FF support separately?
Yes, FK and FF supports can be selected separately, but they are often used together as a fixed-side and floated-side support set for one ball screw.
Get FK FF Ball Screw End Support Price
Send the FK FF support model, ball screw diameter, shaft end drawing, installation space and quantity. We will help check whether the selected fixed-side and floated-side supports match your ball screw system.
Email: dlyexport2@dlybearing.com | WhatsApp: +86 166 0578 8856
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