This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X125CB, 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 SI125X125CB
The AirTAC SI125 Standard Cylinder SI125X125CB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 125mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X125CB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X125CB
- 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 SI125X125CB
The AirTAC SI125X125CB is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 125mm stroke. It delivers 6136N push force at 0.5MPa via a G1/2 port. The direct replacement is the SAI125X125CB, which shares identical ISO 15552 mounting dimensions, force output, and CB clevis interface.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. It also adds SAIL and BSAI lock variants absent in the SI line. Note this no-magnet SKU cannot accept sensors, and standard cylinders require external rod locks for load holding.
Airtac SI125 Standard Cylinder SI125X125CB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X125CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X125CB |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAI125X125CB 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 SAI125X125CB 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 SI125X125CB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SI125X125CB Is Used
Heavy Press Operations
Drives robust clamping and pressing fixtures requiring up to 8590N of thrust at 0.7MPa, utilizing the CB clevis for articulated movement.
Pallet Lift Stations
Lifts moderate loads vertically with a safe working capacity near 3682N, securely moving materials within distribution centers.
Large Component Machining
Actuates heavy tooling beds with a 32mm rod and 40mm cushions, ensuring smooth deceleration of substantial moving masses.
Replacing the Airtac SI125 Standard Cylinder SI125X125CB with the SAI125X125CB
To replace the SI125X125CB, order the SAI125X125CB. Verify the ISO 15552 CB clevis mount, 125mm stroke, G1/2 port, and M27x2 rod thread. Because this SKU lacks the -S magnet, it cannot support CS1-B/DS1-B switches. For sizing, the 125mm bore yields 6136N push at 0.5MPa; dropping to an 80mm bore gives 2513N, while a 160mm bore provides 10053N. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant. With a 125mm stroke, side-load risks are low, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X125CB
- ✓ 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 SI125X125CB FAQ
Yes, the AirTAC SI125X125CB is discontinued. The direct replacement is the SAI125X125CB. It is dimensionally interchangeable per ISO 15552, retaining the same bore, stroke, force, G1/2 port, and CB mounting interface.
This double-acting cylinder uses a G1/2 air port. It generates 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a maximum theoretical force of 1251kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X125CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X125CB replacement — usually within 7-8 hours.