Downward Mount Ball Transfer Unit SI-12
The SI-12 is a downward mount ball transfer unit with a 12.7 mm diameter steel ball, rated for 15 kg working load and 20 kg maximum load. It is mounted through a downward flange onto a deck plate, allowing flat, smooth objects like trays to be moved and rotated in any direction by hand. The unit weighs 100 g and is available with a steel, galvanized steel, chrome plated, or stainless steel case.
Product Overview
The SI-12 is a downward mount ball transfer unit with a 12.7 mm diameter steel ball, rated for 15 kg working load and 20 kg maximum load. It is mounted through a downward flange onto a deck plate, allowing flat, smooth objects like trays to be moved and rotated in any direction by hand. The unit weighs 100 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 15 kg per unit in normal service and 20 kg at peak load
- Downward mount fixes the unit from below with a flange and mounting holes
- 12.7 mm diameter steel ball provides consistent rolling under light to medium loads
- Steel or stainless steel case options for dry or wet environments
- Compact size of 45 x 24 mm fits into tight deck spaces
Application Scenarios
- Transfer points between two conveyor lines running at right angles
- Loading tables where trays are rotated by hand before feeding into a machine
- Assembly stations requiring manual repositioning of flat components
- Packaging lines where trays need to be aligned or turned without powered diverters
- Feeding systems for processing machinery where smooth, omnidirectional movement is needed
Who It Is For
- Conveyor system integrators building transfer and rotation points
- Material handling equipment builders designing deck sections with manual movement
- Industrial distributors stocking low load ball transfer units by model and capacity
- Assembly line builders needing manual repositioning points for flat parts
Problems It Solves
- Flat loads that cannot be rotated or repositioned easily on fixed deck plates
- Transfer points where product must change direction without powered components
- Manual alignment of trays or flat components at the end of a line
- Need for a compact, low load unit that fits into tight deck spaces
- Requirement for a downward mount that does not protrude above the deck surface
Technical Features
- 12.7 mm diameter steel ball for consistent rolling under light loads
- Downward flange mount with mounting holes for secure attachment
- Flange diameter of 35 mm matches standard deck hole sizes
- Steel case with optional galvanization, chrome plating, or stainless steel finish
- Unit weight of 100 g for deck load and shipping calculations
Materials
- Carbon steel ball and case for general industrial use
- Galvanized steel case for increased corrosion resistance in humid environments
- Chrome plated case for improved wear resistance and appearance
- Stainless steel case (SUS304) for wet, washdown or corrosive areas
Quality Control
- Load capacity verified against the 15 kg rating before packing
- Ball rotation checked by hand for free movement in all directions
- Material grade confirmed against the case option ordered
Customization Options
- Case material selected between steel, galvanized steel, chrome plated, or stainless steel
- Other SI Series models available where 15 kg is not the right load rating
- Mounting flange size and hole pattern can be adapted for standard deck holes
Use Guide
- Divide the load by the number of units in contact to ensure no more than 15 kg per unit
- Keep peak and impact loading below the 20 kg maximum load figure
- Mount units on a flat, rigid deck plate so all balls sit at the same height
- Use stainless steel case where the deck is exposed to moisture or washdown
- Avoid using on uneven or soft-bottomed items such as cloth-wrapped goods
Specifications
| Model No | SI-12 |
|---|---|
| Mounting | Downward mount |
| Load Capacity | 15 kg |
| Max Load Capacity | 20 kg |
| Weight | 100 g |
| Ball Diameter | 12.7 mm |
| Ball Material | Steel |
| Case Material | Steel, Galvanized Steel, Chrome Plated, Stainless Steel |
| Mount Diameter | 35 mm |
| Dimension | 45 x 24 mm |
Manufacturing Process
Step 1
Machining of the downward flange and case body
Step 2
Assembly of the steel ball and support components
Step 3
Drilling and finishing of mounting holes
Step 4
Final load check and packing
Compared With Other Options
| Flange mount ball transfer units | Downward mount sits below the deck and does not protrude, while a flange mount unit is bolted from above and may interfere with adjacent components |
|---|---|
| Higher load rated units | The SI-12 suits 15 kg loads, so heavier applications require a larger model with higher capacity |
| Swivel casters | Ball transfer units allow omnidirectional movement on a flat surface, while casters are designed for floor movement and are not suitable for deck-mounted use |
Downward Mount Ball Transfer Unit SI-12 Questions
What load can one SI-12 ball transfer unit carry?
The rated load capacity is 15 kg per unit and the maximum load capacity is 20 kg.
How is the SI-12 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?
Steel for general use, galvanized steel for humid environments, chrome plated for wear resistance, and stainless steel (SUS304) for wet or washdown areas.
Is a stainless steel version available?
Yes, the case can be supplied in stainless steel (SUS304).
How much does the unit weigh?
Each SI-12 weighs 100 g, which is used when calculating deck weight and shipping.
Can I get other load ratings in the same series?
Yes, the SI Series includes other load ratings, so ask for the model that matches your load per unit.
Get a Price for Downward Mount Ball Transfer Unit SI-12
Send the quantity and any material or surface option you need, and a quotation comes back against this model number.