This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1400S, 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 SI125X1400S
The AirTAC SI125 Standard Cylinder SI125X1400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1400S
- 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 SI125X1400S
The AirTAC SI125X1400S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1400 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1400S direct replacement, which maintains the exact ISO 15552 mounting interface, bore, output force, and port size for seamless fixture integration.
The SAI upgrade features an improved piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. This -S model includes a piston magnet for CS1-B/DS1-B switches, and Viton H seals can raise the operating temperature to 150 C.
Airtac SI125 Standard Cylinder SI125X1400S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1400S |
| Bore size | Ø125 mm |
| Stroke | 1400 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 SAI125X1400S 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 SAI125X1400S 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 SI125X1400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1400 | 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 SI125X1400S Is Used
Long-Stroke Material Transfer
Pushes heavy pallets 1400 mm between conveyor lines using 6136 N of thrust at 0.5 MPa, guided by external rails to prevent rod bending.
Large Press Ejection
Ejects formed parts from heavy presses, relying on the 40 mm adjustable air cushions to decelerate the 32 mm rod at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X1400S with the SAI125X1400S
To replace the SI125X1400S, order the SAI125X1400S direct, verifying the ISO 15552 mounting interface, G1/2 port, and -S magnet. If downsizing, adjacent bores offer lower force: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. For load holding, note that a plain cylinder drifts without live air; the 40 mm cushions only decelerate. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for secure holding. Because the 1400 mm stroke is long, prevent rod bending by using external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1400S
- ✓ 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 SI125X1400S FAQ
Yes, the SI125X1400S is discontinued. The direct replacement is the SAI125X1400S. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 1400 mm stroke, G1/2 port, and mounting interface.
It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s. The G1/2 port and M27x2 rod thread are fixed by the 125 mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1400S replacement — usually within 7-8 hours.