This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150SH, 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 SI125X150SH
The AirTAC SI125 Standard Cylinder SI125X150SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150SH
- 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 SI125X150SH
The AirTAC SI125X150SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 150 mm stroke. Built with an extruded aluminum barrel and adjustable air cushions at both ends, it delivers a push force of 6136 N and pull force of 5734 N at 0.5 MPa. The SAI125X150SH is the direct replacement, matching the G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface.
The SAI upgrade introduces an advanced piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SI variant includes a piston magnet for CS1-B/DS1-B switches and a Viton H seal, elevating the operating temperature range from -20 to +70 C up to 0-150 C.
Airtac SI125 Standard Cylinder SI125X150SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150SH |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150SH 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 SAI125X150SH 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 SI125X150SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150SH Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring high push force over a 150 mm stroke.
Pallet Actuation
Shifts loaded pallets on assembly lines where 6136 N at 0.5 MPa easily overcomes friction.
High-Tamp Clamping
Secures hot workpieces in thermal processing zones using the Viton H 0-150 C seal option.
Replacing the Airtac SI125 Standard Cylinder SI125X150SH with the SAI125X150SH
To replace the discontinued SI125X150SH, order the SAI125X150SH. Confirm the ISO 15552 mounting interface, 125 mm bore, 150 mm stroke, G1/2 port, and your specific mounting accessory. The -S denotes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI family uses current AirTAC switches. The -H indicates a Viton H high-temperature seal (0-150 C). If you need a larger bore, step up to 160 mm; if downsizing, a 100 mm bore yields 3927 N push at 0.5 MPa. A plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option for compact setups.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150SH
- ✓ 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 SI125X150SH FAQ
Yes, the SI125X150SH is discontinued. The direct replacement is the SAI125X150SH. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 150 mm stroke, output force, G1/2 port, and mounting fixtures.
This double-acting cylinder features a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150SH replacement — usually within 7-8 hours.