This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700STC, 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 SI125X700STC
The AirTAC SI125 Standard Cylinder SI125X700STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X700STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X700STC
- 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 SI125X700STC
The AirTAC SI125X700STC is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 700mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X700STC, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and TC trunnion mount.
The SAI upgrade features a refined piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. It also adds lock and valve variants the SI lacked, like SAIL and BSAI. The original SI -S magnet supports CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI125 Standard Cylinder SI125X700STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700STC |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAI125X700STC 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 SAI125X700STC 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 SI125X700STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SI125X700STC Is Used
Heavy Material Lifts
Drives large vertical platens and heavy lifting stages where the 6136 N push force at 0.5 MPa easily shifts substantial masses.
Pallet Diversion
Pushes loaded pallets off high-capacity conveyor lines, utilizing the 700mm stroke to clear the transfer zone completely.
Press Actuation
Actuates heavy-duty pressing and stamping fixtures, relying on the 125mm bore's robust 11045 N thrust at 0.9 MPa.
Replacing the Airtac SI125 Standard Cylinder SI125X700STC with the SAI125X700STC
To replace the SI125X700STC, order the SAI125X700STC. Verify the ISO 15552 TC trunnion interface, 125mm bore, 700mm stroke, G1/2 port, and the -S magnet for position sensing. Sizing both ways: a neighbouring 100mm bore yields 3927 N push at 0.5 MPa, while a 160mm bore yields 10053 N. If you need to hold the load without live air, note that a plain cylinder drifts and the air cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 700mm stroke, prevent rod bending by using an external guide to manage side loads. The bore operates at 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700STC
- ✓ 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 SI125X700STC FAQ
Yes, the AirTAC SI125X700STC is discontinued. The direct replacement is the SAI125X700STC. It shares the same ISO 15552 mounting interface, 125mm bore, 700mm stroke, G1/2 port, and TC trunnion mount, fitting directly into existing fixtures.
The 125mm bore uses a G1/2 port. It generates 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. The piston rod is Ø32 mm with an M27x2 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X700STC replacement — usually within 7-8 hours.