Downward Mount Ball Transfer Unit SI-25
The SI-25 is a downward mount ball transfer unit with a 25.4 mm diameter steel ball, rated for 150 kg working load and 200 kg maximum load. It is mounted through a downward flange onto a deck plate so that flat, smooth items like trays can be moved and rotated in any direction by hand. The unit weighs 490 g and is available with a steel, galvanized steel, chrome plated, or stainless steel case.
Product Overview
The SI-25 is a downward mount ball transfer unit with a 25.4 mm diameter steel ball, rated for 150 kg working load and 200 kg maximum load. It is mounted through a downward flange onto a deck plate so that flat, smooth items like trays can be moved and rotated in any direction by hand. The unit weighs 490 g and is available with a steel, galvanized steel, chrome plated, or stainless steel case.
Part of the SI SD Series range, used in Warehouse and Distribution Centres.
Key Benefits
- Carries 150 kg per unit in normal service and 200 kg at peak load
- Downward mount fixes the unit from below with a flange and two screw holes for secure attachment
- 25.4 mm diameter ball allows smooth movement of flat, rigid items across a deck
- Steel or stainless steel case options suit dry, wet, or washdown environments
- Two screw holes in the flange allow firm mounting to a worktable or deck plate
Application Scenarios
- Transfer points between two conveyor lines where product must change direction without powered diverters
- Feeding tables in packaging or processing machinery where trays are rotated or repositioned by hand
- Assembly stations where a flat fixture needs to be turned or aligned during operation
- Workbenches on production lines where a heavy tray must be pushed and turned in any direction
- Curved work surfaces on band saws or router tables where omnidirectional movement is required
Who It Is For
- Conveyor system integrators building transfer points with directional change
- Material handling equipment builders designing worktables and feeding systems
- Industrial distributors stocking ball transfer units by load and mounting type
- Assembly line builders needing manual repositioning of flat components
- Packaging machinery builders requiring smooth movement of trays on curved surfaces
Problems It Solves
- Flat items that jam or drag when pushed across a fixed deck plate or plain rollers
- Transfer points where product must change direction without powered components
- Operators struggling to rotate or align a load by hand at the end of a line
- Worktables where a single unit must support both light and heavy flat loads
- Curved surfaces where standard rollers cannot provide omnidirectional movement
Technical Features
- 25.4 mm diameter steel ball for consistent rolling under load
- Downward flange mount with two screw holes for secure attachment to deck plate
- Housing made from carbon steel, galvanized steel, chrome plated steel, or stainless steel
- Steel ball material ensures durability and load capacity under repeated use
- Unit weight of 490 g for deck load and shipping calculations
Materials
- Carbon steel ball and case for general industrial use
- Galvanized steel case for improved corrosion resistance in humid environments
- Chrome plated steel case for enhanced wear resistance and appearance
- Stainless steel case (SUS304) for wet, washdown, or corrosive areas
Quality Control
- Load capacity verified against the 150 kg working load rating before packing
- Ball rotation checked by hand for free movement in all directions
- Material grade confirmed against the case and ball option ordered
Customization Options
- Case material selected between carbon steel, galvanized steel, chrome plated steel, and stainless steel (SUS304)
- Ball material is steel, as standard, with no alternative material listed
- Other SI Series load ratings available where 150 kg is not the right size
Use Guide
- Divide the load by the number of units in contact to ensure the 150 kg per unit rating is not exceeded
- Keep peak and impact loading below the 200 kg maximum load figure
- Mount units on a flat deck plate so all balls sit at the same height
- Choose stainless steel case where the deck is exposed to washdown or corrosive conditions
- Use only on flat, smooth surfaces such as trays; do not use on soft or uneven bottom surfaces
Specifications
| Model No | SI-25 |
|---|---|
| Mounting | Downward mount |
| Load Capacity | 150 kg |
| Max Load Capacity | 200 kg |
| Weight | 490 g |
| Ball Diameter | 25.4 mm |
| Mount Diameter | 45 mm |
| Ball Material | Steel |
| Case Material | Steel, Galvanized Steel, Chrome Plated Steel, Stainless Steel (SUS304) |
Manufacturing Process
Step 1
Machining of the flange and case body
Step 2
Assembly of the steel ball and support components
Step 3
Drilling and finishing of the two screw holes in the flange
Step 4
Final load check and packing
Compared With Other Options
| Flange mount ball transfer units | Downward mount fixes from below and allows access to the deck surface, while a flange mount is bolted from above and may interfere with deck clearance |
|---|---|
| Lower rated SI Series units | The SI-25 suits 150 kg loads, so lighter applications are better served by a smaller unit that rolls with less effort |
| Standard conveyor rollers | Ball transfer units allow movement in any direction, while rollers only move product along one axis |
Downward Mount Ball Transfer Unit SI-25 Questions
What load can one SI-25 ball transfer unit carry?
The rated load capacity is 150 kg per unit and the maximum load capacity is 200 kg.
How is the SI-25 mounted?
It is a downward mount unit, so it is bolted through the flange from below the deck plate.
Which case material should I choose?
Carbon steel for general use, galvanized steel for humid areas, chrome plated steel for wear resistance, stainless steel (SUS304) for wet or washdown environments.
Is a stainless steel version available?
Yes, the case can be supplied in stainless steel (SUS304).
How much does the unit weigh?
Each SI-25 weighs 490 g, which is used for deck load and shipping calculations.
Can I get other load ratings in the same series?
Yes, the SI Series covers other load ratings, so ask for the model that matches your load per unit.
Get a Price for Downward Mount Ball Transfer Unit SI-25
Send the quantity and any material or surface option you need, and a quotation comes back against this model number.