This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X440SH, 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 SI125X440SH
The AirTAC SI125 Standard Cylinder SI125X440SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 440mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X440SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke440 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X440SH
- 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 SI125X440SH
The AirTAC SI125X440SH is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 440mm stroke. It delivers 6136N push force at 0.5MPa and features a G1/2 port, M27x2 rod thread, and 40mm adjustable air cushions. The direct replacement is the SAI125X440SH, which shares the exact ISO 15552 mounting interface, force, and port size. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life.
Because this SKU includes the -S magnet and -H Viton seal, it supports legacy CS1-B/DS1-B switches and operates in high-temperature environments up to 150C. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line. Remember that a standard cylinder drifts without live air; the cushion only decelerates. For load holding, use an external rod lock or pilot check valve.
Airtac SI125 Standard Cylinder SI125X440SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X440SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X440SH |
| Bore size | Ø125 mm |
| Stroke | 440 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 SAI125X440SH 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 SAI125X440SH 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 SI125X440SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×440 | 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 SI125X440SH Is Used
Heavy Stamping Press
Drives large platens and heavy dies requiring 6136N push force at 0.5MPa, absorbing end-of-stroke kinetic energy via 40mm adjustable cushions.
High-Temp Ejector
Ejects moulded parts near hot machinery using the Viton H seal rated for 150C, relying on the G1/2 port for high-volume exhaust flow.
Replacing the Airtac SI125 Standard Cylinder SI125X440SH with the SAI125X440SH
To replace the discontinued SI125X440SH, order the SAI125X440SH. It is a direct per ISO 15552 mounting dimensions, matching the 125mm bore, 440mm stroke, G1/2 port, and M27x2 thread. Confirm your mounting accessory (LB, FA, TC, etc.) and retain the -S for the magnet and -H for the Viton high-temp seal. The SAI uses current AirTAC switches instead of the legacy CS1-B/DS1-B. When sizing, neighbouring bores offer different forces: the 100mm bore pushes 3927N at 0.5MPa, while the 160mm bore pushes 10053N. At 440mm stroke, prevent rod bending by supporting side loads with external guides. A plain cylinder does not hold load without air; for locking, specify the SAIL or BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X440SH
- ✓ 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 SI125X440SH FAQ
Yes, the SI125X440SH is discontinued. The direct replacement is the SAI125X440SH. It shares the identical ISO 15552 mounting interface, 125mm bore, 440mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly while adding an upgraded piston seal.
The bore is 125mm with a G1/2 air port. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X440SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X440SH replacement — usually within 7-8 hours.