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
Controlled torque for flexible narrow-roll winding.
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 a ball differential friction shaft is used
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
Slip ring options and core-contact details
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
Confirm core material, core inner diameter, required width, winding tension range, shaft structure and whether the application needs low starting tension or higher roll-holding force.
Technical Reference Data
Pull force and air pressure reference values for preliminary selection.
Reference values should be confirmed according to the actual shaft structure, ring width, groove material, pressure method and air path before final selection.
Pressures are given in kg/cm² as published by the manufacturer. For conversion: 1 kg/cm² = 0.98 bar = 14.2 psi. So 1 kg/cm² ≈ 1 bar, and 5 kg/cm² ≈ 4.9 bar ≈ 71 psi.
How to use these figures: they are reference values for a single ring, measured under the stated test conditions — that ring width, that friction material and that groove. Total winding torque on your machine depends on how many rings are on the shaft, the roll diameter as it builds, the condition of the friction material and the line speed, so these numbers cannot be used directly to calculate web tension. Send us the slit widths, the number of rolls across and the tension range you need, and we will confirm the ring configuration before you size anything.
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 |
Related Slip Shaft Types
Air Slip Shaft
Air slip shafts combine pneumatic core locking with controlled differential slip for accurate torque and stable multi-roll winding.
View DetailsLow Tension Slip Shaft
Low tension slip shafts are designed for sensitive materials that require stable winding at low air pressure and low torque.
View DetailsDS Slip Shaft
DS slip shafts provide pneumatic core locking and controlled slip for medium-tension film slitting and rewinding applications.
View DetailsDouble Ball and Roller Slip Shaft
Double ball and roller slip shafts use extended expansion contact points to support stable core holding and winding torque.
View DetailsKey Slip Shaft
Key slip shafts use rectangular metal or rubber keys to expand and contact the core for controlled differential winding.
View Details