Very narrow slit widths
Slitting from 5 mm width upward, which is the narrowest of the six structures here.
Narrow-Roll Differential Winding Shaft
Ball Differential Friction Shaft
Ball slip shafts can be configured as center-air, pneumatic side-pressure or mechanical side-pressure structures for flexible narrow-roll winding. Also known as: ball slip shaft, ball friction shaft.
Ball-Type Winding Structure
Ball structures for roll-by-roll torque compensation
Suitable for narrow-width slitting from 5 mm and for film, paper and label rewinding applications where roll-specific torque compensation is required.
- Can be built as center-air-pressure, pneumatic side-pressure or mechanical side-pressure slip shafts.
- The center-air design has low mechanical torque loss and delivers torque in proportion to air pressure.
- Supports a broad winding tension range according to shaft structure, ring type and air pressure setting.
- Suitable for rolls as narrow as 5 mm, with roll width selection based on the actual winding layout.
| 3-inch Ring | 75.5 mm OD, 78.2 mm maximum expansion |
|---|---|
| 6-inch Ring | 151 mm OD, 155.5 mm maximum expansion |
| Core Sizes | 76.2 +/- 0.2 mm and 152.4 +/- 0.2 mm |
| Widths | Single-ball 10-25 mm; double-ball 15-50 mm |
| Minimum Slitting Width | From 5 mm depending on shaft and ring layout |
Where ball rings suit narrow slit layouts
Label and paper rewinding
Roll-specific torque compensation where many narrow rolls are wound across one shaft.
Flexible mounting
Can be built as center-air, pneumatic side-pressure or mechanical side-pressure, so it fits machines that cannot take a center-air shaft.
3-inch and 6-inch cores
Single-ball rings 10–25 mm and double-ball rings 15–50 mm on 3-inch; 30–50 mm on 6-inch.
Slip Ring
Single-ball and double-ball widths for 3-inch and 6-inch cores
Ball slip rings can be selected according to core size, ring width, ball structure, pressure method and required winding torque.
- 3-inch ring outside diameter is 75.5 mm and expands to 78.2 mm.
- Maximum expansion diameter of the steel-ball ring is 78.2 mm.
- Suitable paper core inner diameter is 76.2 +/- 0.2 mm.
- Standard 3-inch width is 25 mm; single-ball rings are available in 10, 15, 20 and 25 mm widths.
- Double-ball rings are available in 15, 20, 25, 30, 35, 40, 45 and 50 mm widths.
- Standard inner diameter is 60 mm.
- 6-inch ring outside diameter is 151 mm and expands to 155.5 mm; suitable core is 152.4 +/- 0.2 mm.
- 6-inch standard widths are 35 and 45 mm, with 30, 40 and 50 mm options.
Selection Notes
Start a ball-ring inquiry with the narrowest slit width and the number of rolls in the winding layout. Then identify single-ball or double-ball construction and the method used to apply pressure. The listed 5 mm minimum slitting width depends on the complete shaft and ring layout; it should not be read as a 5 mm replacement-ring width.
Replacement Slip Rings
Replacement ball rings: bore, width and pressure method
Availability
Individual ball slip rings are available without purchasing a replacement shaft assembly. We can review rings for another maker’s shaft when the dimensions and pressure method are matched. Lead time is confirmed with the quotation once the ball arrangement and fit information are clear.
What to measure / send
Tell us whether each ring is single-ball or double-ball and whether pressure is central air, pneumatic side pressure or mechanical side pressure. Measure the ring bore, listed here as 60 mm, and the actual width: 3-inch single-ball options span 10–25 mm and double-ball options span 15–50 mm. Give the core inner diameter, 76.2 mm for 3-inch or 152.4 mm for 6-inch, plus shaft keyslot or air-hole locations, quantity, and photographs of the removed ring beside its shaft.
What ships
You receive a ball slip ring configured in the confirmed single-ball or double-ball structure, with the agreed inner diameter, width and friction material. Core size and pressure method belong in that configuration; the ball-ring family name by itself does not define the replacement.
A narrow slit and a ring width describe different things
This shaft family is listed for slitting from 5 mm, but its ring widths are specified separately. Three-inch single-ball rings are offered in 10, 15, 20 and 25 mm widths, while the double-ball range extends from 15 to 50 mm. An inquiry therefore needs the finished slit width as well as the measured ring width. Keeping those measurements separate lets the replacement review follow the winding layout rather than infer a ring dimension from the narrowest product roll.
Pressure method and core size define the ball assembly
Center-air, pneumatic side-pressure and mechanical side-pressure versions are all described for the ball shaft. Confirm which arrangement is already on the machine before choosing from the dimensional list. Three-inch and six-inch cores also have different outside and expansion diameters, even though both belong to the same ball-ring family. The published force test uses a 3-inch double-ball ring with a 25 mm width and 60 mm inner diameter; its wool-felt groove condition is part of that test, not a specification for every single-ball or six-inch replacement.
Technical Reference Data
Double-ball pull-force readings across the pressure range
Ball force data below retain the individual test dimensions, materials and pressure conditions; compare those conditions with the ring you need.
Read the shared measurement and pressure guidance before applying these double-ball test readings.
Ball Slip Shaft Pull Force, Low Pressure Range
Test condition: 3-inch double-ball slip ring, 25 mm width, 60 mm inner diameter, 20 x 3 groove with wool felt.
| Air Pressure (kg/cm2) | 0 | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 | 2.2 | 2.4 | 2.6 | 2.8 | 3.0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pull Force (kg) | 0.17 | 0.21 | 0.41 | 0.52 | 0.79 | 1.00 | 1.12 | 1.38 | 1.54 | 1.77 | 1.87 | 1.99 | 2.08 | 2.14 | 2.24 | 2.46 |
Ball Slip Shaft Pull Force, High Pressure Range
Continuation of the 3-inch double-ball slip ring test.
| Air Pressure (kg/cm2) | 3.2 | 3.4 | 3.6 | 3.8 | 4.0 | 4.2 | 4.4 | 4.6 | 4.8 | 5.0 | 5.2 | 5.4 | 5.6 | 5.8 | 6.0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pull Force (kg) | 2.62 | 2.78 | 2.85 | 3.12 | 3.33 | 3.42 | 3.61 | 3.86 | 4.00 | 4.26 | 4.42 | 4.66 | 4.92 | 5.12 | 5.24 |
When a ball layout should be compared with another contact type
Air Slip Shaft
When the narrow-roll ball layout is being reconsidered for electrode, separator or battery foil work, review air rings with the stated 12- and 16-piston options.
View DetailsLow Tension Slip Shaft
If starting pressure dominates the ball-shaft inquiry, review the low-tension model’s explicit 0.1 kg/cm² specification and positioning-ball/bearing arrangement.
View DetailsDS Slip Shaft
For medium-tension flexible-packaging laminates, DS is a separate pneumatic option; its 0.8 kg/cm² start must be acceptable before comparing ring dimensions.
View DetailsDouble Ball and Roller Slip Shaft
If extended contact along the core is the deciding requirement, compare the cylindrical roller arrangement with the ball-contact structure shown here.
View DetailsKey Slip Shaft
Where the core calls for rectangular contact rather than ball contact, compare metal and rubber key versions, especially for rubber or aluminum cores.
View DetailsRequest a single-ball or double-ball ring fit review
Have a drawing of your shaft or a photo of the old rings? Send it on WhatsApp or to sales@kendoric.com — we check fit before quoting.