This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X240SH, 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 SI125X240SH
The AirTAC SI125 Standard Cylinder SI125X240SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 240mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X240SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke240 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X240SH
- 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 SI125X240SH
The AirTAC SI125X240SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 240 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X240SH, matching the interface, bore, stroke, force, and mounting. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
This unit includes a piston magnet for CS1-B/DS1-B switches and a Viton H seal, extending operating temperature to 0-150 C. A plain cylinder drifts without live air; for load holding, use the SAIL lock or BSAI clamp-lock variants.
Airtac SI125 Standard Cylinder SI125X240SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X240SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X240SH |
| Bore size | Ø125 mm |
| Stroke | 240 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 SAI125X240SH 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 SAI125X240SH 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 SI125X240SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×240 | 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 SI125X240SH Is Used
Heavy Press Clamping
Ideal for securing heavy metal components during machining, using the 6136 N push force at 0.5 MPa to hold parts firmly against the fixture bed.
Vertical Load Lowering
Controls the descent of 313 kg payloads in material handling systems, relying on adjustable air cushions to decelerate the stroke smoothly.
High-Temperature Actuation
Suitable for hot environments up to 150 C near ovens or dryers, thanks to the Viton H seal option maintaining reliable actuation.
Replacing the Airtac SI125 Standard Cylinder SI125X240SH with the SAI125X240SH
To replace the SI125X240SH, order the SAI125X240SH. Verify the ISO 15552 mounting interface, 125 mm bore, 240 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B switches. The SAI family adds SAIL, SAIF, and BSAI variants the SI lacked. For sizing both ways: dropping to a 100 mm bore reduces push force to 3927 N at 0.5 MPa, while a 160 mm bore increases it to 10053 N. A plain cylinder does not hold load on air loss; use an external rod lock, pilot check valve, or SAIL/BSAI variant. The 240 mm stroke is under the 300 mm side-load threshold, but ensure adequate guiding for the 32 mm rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X240SH
- ✓ 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 SI125X240SH FAQ
Yes, the SI125X240SH is discontinued. The direct replacement is the SAI125X240SH. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 240 mm stroke, 6136 N force, G1/2 port, and mounting interface.
The 125 mm bore generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa, with a theoretical max of 1251 kgf at 1.0 MPa. The operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X240SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X240SH replacement — usually within 7-8 hours.