This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X238S, 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 SI125X238S
The AirTAC SI125 Standard Cylinder SI125X238S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 238mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X238S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke238 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X238S
- 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 SI125X238S
The AirTAC SI125X238S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore, 238 mm stroke, and a G1/2 port. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125X238S.
The SAI direct retains identical ISO 15552 mounting dimensions, bore, and output. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure.
Airtac SI125 Standard Cylinder SI125X238S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X238S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X238S |
| Bore size | Ø125 mm |
| Stroke | 238 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 SAI125X238S 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 SAI125X238S 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 SI125X238S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×238 | 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 SI125X238S Is Used
Heavy Pressing
Applies up to 8590 N at 0.7 MPa for seating large bearings and heavy stamping operations.
Pallet Handling
Drives robust lifting arms in automated storage systems, moving loads safely under 3682 N.
Mold Clamping
Secures heavy injection molds with a theoretical maximum holding force of 1251 kgf at 1.0 MPa.
Replacing the Airtac SI125 Standard Cylinder SI125X238S with the SAI125X238S
To replace the SI125X238S, order the SAI125X238S, confirming the ISO 15552 interface, 125 mm bore, 238 mm stroke, G1/2 port, and -S magnet for CS1-B/DS1-B switches. If downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant. At 238 mm stroke, rod-bending is minimal, but ensure guide alignment to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X238S
- ✓ 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 SI125X238S FAQ
Yes, the SI125X238S is discontinued. The direct replacement is the SAI125X238S, matching the 125 mm bore, 238 mm stroke, G1/2 port, and ISO 15552 mounting interface.
It features a G1/2 port. Forces are: 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 maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X238S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X238S replacement — usually within 7-8 hours.