This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1100STC, 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 SI125X1100STC
The AirTAC SI125 Standard Cylinder SI125X1100STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1100STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1100STC
- 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 SI125X1100STC
The AirTAC SI125X1100STC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1100 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1100STC, a direct upgrade retaining the exact ISO 15552 mounting interface, TC trunnion mount, and M27x2 rod thread.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. The -S magnet supports CS1-B/DS1-B sensors, while Viton H seals raise heat limits to 150 C.
Airtac SI125 Standard Cylinder SI125X1100STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1100STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1100STC |
| Bore size | Ø125 mm |
| Stroke | 1100 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 SAI125X1100STC 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 SAI125X1100STC 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 SI125X1100STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1100 | 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 SI125X1100STC Is Used
Large Press Ejection
Provides the long 1100 mm reach and robust 125 mm bore power required to eject bulky formed parts or scrap from heavy industrial presses.
Oversized Package Divert
Actuates long-stroke diverter arms on high-capacity conveyor lines, requiring the TC trunnion mount to handle the extended 1100 mm stroke pivot forces.
Replacing the Airtac SI125 Standard Cylinder SI125X1100STC with the SAI125X1100STC
To replace the SI125X1100STC, order the SAI125X1100STC. Confirm the ISO 15552 TC trunnion interface, 125 mm bore, 1100 mm stroke, G1/2 port, and -S magnet for CS1-B/DS1-B switches. If sizing down, the 100 mm bore gives 3927 N push at 0.5 MPa; sizing up to 160 mm yields 10053 N. Because this is a 1100 mm stroke, use an external guide to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1100STC
- ✓ 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 SI125X1100STC FAQ
Yes, the SI125X1100STC is discontinued. The direct replacement is the SAI125X1100STC. It shares the same ISO 15552 mounting interface, 125 mm bore, 1100 mm stroke, G1/2 port, and TC trunnion mount, fitting existing fixtures perfectly.
The G1/2 port feeds a 32 mm rod delivering 6136 N push and 5734 N pull at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa, operating at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1100STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1100STC replacement — usually within 7-8 hours.