This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X750SCB, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X750SCB
The AirTAC SI125 Standard Cylinder SI125X750SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 750mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X750SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke750 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X750SCB
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125X750SCB
The AirTAC SI125X750SCB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 750 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X750SCB, matching the interface, force, and CB clevis mount.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X750SCB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X750SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X750SCB |
| Bore size | Ø125 mm |
| Stroke | 750 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X750SCB carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X750SCB produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X750SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×750 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X750SCB Is Used
Heavy Material Lifts
Ideal for elevating heavy material trays using the 6136 N push force, provided an external guide supports the 750 mm stroke.
Large Press Ejection
Deploys the 5734 N pull force at 0.5 MPa to extract large formed parts from heavy-duty manufacturing presses.
Pallet Positioning
Shifts or indexes loaded pallets along conveyors where the CB clevis mount absorbs lateral alignment shifts.
Replacing the Airtac SI125 Standard Cylinder SI125X750SCB with the SAI125X750SCB
To replace the SI125X750SCB, order the SAI125X750SCB. Verify the ISO 15552 CB clevis mounting, 750 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If downsizing, a 100 mm bore gives 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore yields 10053 N. At 750 mm, use an external guide to prevent rod bending. For load holding, note that cushions only decelerate; use a pilot check valve or SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X750SCB
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X750SCB FAQ
Yes, the SI125X750SCB is discontinued. The direct replacement is the SAI125X750SCB. It shares the same ISO 15552 mounting interface, 125 mm bore, 750 mm stroke, force, G1/2 port, and CB clevis, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/2 port. It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X750SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X750SCB replacement — usually within 7-8 hours.