Flange Mount Ball Transfer Unit SD-51
The SD-51 is a flange mount ball transfer unit with a 51 mm diameter steel main ball, rated for 600 kg working load and 700 kg maximum load. It is designed to be bolted onto a deck plate or workbench using a flange with two mounting holes, allowing heavy flat or smooth objects like trays to be moved and rotated in any direction by hand. The unit weighs 5.6 kg and is available in carbon steel, galvanized steel, chrome-plated steel, or stainless steel (SUS304) cases.
Product Overview
The SD-51 is a flange mount ball transfer unit with a 51 mm diameter steel main ball, rated for 600 kg working load and 700 kg maximum load. It is designed to be bolted onto a deck plate or workbench using a flange with two mounting holes, allowing heavy flat or smooth objects like trays to be moved and rotated in any direction by hand. The unit weighs 5.6 kg and is available in carbon steel, galvanized steel, chrome-plated steel, or stainless steel (SUS304) cases.
Part of the SI SD Series range, used in Warehouse and Distribution Centres.
Key Benefits
- Carries 600 kg per unit in normal service and 700 kg at peak load
- Flange mount with two screw holes allows secure attachment and easy removal for maintenance
- 51 mm diameter steel ball enables smooth omnidirectional movement under heavy static and dynamic loads
- Available in carbon steel, galvanized steel, chrome-plated steel, or stainless steel (SUS304) for different environmental conditions
- Suitable for high-load transfer points in industrial processing and feeding systems
Application Scenarios
- Transfer tables between two conveyor lines running at right angles in a high-load production line
- Loading and unloading stations for heavy trays or flat metal sheets in assembly or machining cells
- Rotating platforms on processing machinery where a large flat component must be repositioned by hand
- Feeding systems in packaging lines where heavy trays are moved and aligned without powered guidance
- Workbenches on router tables or band saws requiring 360-degree movement of flat workpieces
Who It Is For
- Conveyor system integrators building high-load transfer and rotation points
- Industrial equipment builders designing feeding and processing stations
- Assembly line builders needing reliable manual rotation of heavy components
- Material handling equipment makers constructing workbenches with omnidirectional movement
- Industrial distributors stocking ball transfer units by load rating and mounting type
Problems It Solves
- Heavy flat loads that jam or bind when pushed across a fixed deck plate or standard rollers
- Transfer points where product must change direction without a powered diverter or actuator
- Operators struggling to rotate or align a heavy tray or sheet by hand at the end of a line
- Need for a single, consistent component range that matches tube diameter, shaft size, and load rating
- Lack of a durable, high-load ball transfer unit that can be securely mounted and maintained
Technical Features
- 51 mm diameter steel main ball for high load capacity and durability
- Flange mount with two screw holes for secure attachment to deck plates or workbenches
- Housing made from carbon steel, galvanized steel, chrome-plated steel, or stainless steel (SUS304)
- Omnidirectional movement enabled by a spherical ball within a restraining fixture
- Unit weight of 5.6 kg for deck load and shipping calculations
Materials
- Carbon steel ball and case for general industrial use
- Galvanized steel case for improved corrosion resistance in moderate environments
- Chrome-plated steel case for enhanced wear resistance and appearance
- Stainless steel (SUS304) case for wet, washdown, or corrosive environments
Quality Control
- Load capacity verified against the 600 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
- Flange mounting holes inspected for correct alignment and thread integrity
Customization Options
- Case material selected between carbon steel, galvanized steel, chrome-plated steel, or stainless steel (SUS304)
- Ball material is steel; no nylon or stainless steel ball option available for this model
- Other SD Series load ratings available where 600 kg is not the right size
Use Guide
- Divide the load by the number of units in contact to ensure no more than 600 kg per unit under normal use
- Keep peak and impact loading below the 700 kg maximum load figure
- Mount units on a flat, rigid deck plate so all balls sit at the same height
- Choose stainless steel case for wet, washdown, or corrosive environments
- Use only on flat, smooth surfaces such as trays or metal sheets; not suitable for soft or uneven bottoms
Specifications
| Model No | SD-51 |
|---|---|
| Mounting | Flange mount |
| Load Capacity | 600 kg |
| Max Load Capacity | 700 kg |
| Weight | 5.6 kg |
| Ball Diameter | 51 mm |
| Mount Diameter | 102 mm |
| Ball Material | Steel |
| Case Material | Carbon steel, galvanized steel, chrome-plated steel, stainless steel (SUS304) |
| Dimensions | 127 x 98 mm (Diameter x Height) |
Manufacturing Process
Step 1
Machining of the flange and case body
Step 2
Assembly of the 51 mm steel ball and support mechanism
Step 3
Drilling and finishing of mounting holes in the flange
Step 4
Surface treatment (galvanizing, chrome plating, or stainless steel selection) based on order
Step 5
Load check and final inspection before packing
Compared With Other Options
| Press mount ball transfer units | Flange mount bolts to the deck and can be removed for service, while a press fit unit is faster to install but harder to replace |
|---|---|
| Lower rated SD Series units | The SD-51 suits 600 kg loads, so lighter decks are better served by a smaller unit that rolls with less effort |
| Plain conveyor rollers | Ball transfer units allow movement in any direction, while rollers only move product along one axis |
Flange Mount Ball Transfer Unit SD-51 Questions
What load can one SD-51 ball transfer unit carry?
The rated load capacity is 600 kg per unit and the maximum load capacity is 700 kg.
How is the SD-51 mounted?
It is a flange mount unit, so it is bolted through the flange onto the deck plate using two screw holes.
Which case material should I choose?
Carbon steel for general use, galvanized steel for moderate corrosion resistance, chrome-plated steel for wear resistance, or 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 SD-51 weighs 5.6 kg, which is used when calculating deck weight and shipping.
Can I get other load ratings in the same series?
Yes, the SD Series covers other load ratings, so ask for the model that matches your load per unit.
Get a Price for Flange Mount Ball Transfer Unit SD-51
Send the quantity and any material or surface option you need, and a quotation comes back against this model number.