This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X30H, 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 SI125X30H
The AirTAC SI125 Standard Cylinder SI125X30H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X30H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X30H
- 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 SI125X30H
The AirTAC SI125X30H is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 30 mm stroke. Built for high-temperature duty with Viton H seals (0 to 150 C), it delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this EOL unit with the SAI125X30H, a direct sharing the exact ISO 15552 mounting interface, M27x2 rod thread, and 40 mm cushions.
The SAI125X30H upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; for load holding on air loss, look to the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X30H Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X30H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X30H |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125X30H 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 SAI125X30H 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 SI125X30H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125X30H Is Used
High-Temp Pressing
Short-stroke 6136 N pressing in hot environments up to 150 C using Viton H seals for reliable actuation.
Heavy Clamping Jigs
Securely clamping heavy components with a 313 kg vertical lift capacity at standard 0.5 MPa air pressure.
Industrial Valve Actuation
Switching large process valves requiring substantial push force and a robust 32 mm piston rod.
Replacing the Airtac SI125 Standard Cylinder SI125X30H with the SAI125X30H
To replace the SI125X30H, order the SAI125X30H. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port, and the Viton H high-temp seal. Because this SKU lacks the -S magnet, it cannot accept CS1-B/DS1-B sensors; if position detection is needed, switch to a magnet-equipped SAI. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while a neighbouring 100 mm bore offers 3927 N. A plain cylinder drifts without live air, so use an external rod lock or pilot check valve for holding. The 30 mm stroke is very short, so side-load risks are minimal, but always guide the load.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X30H
- ✓ 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 SI125X30H FAQ
Yes, the SI125X30H is discontinued. The direct replacement is the SAI125X30H. It shares the identical ISO 15552 mounting interface, 125 mm bore, 30 mm stroke, G1/2 port, and Viton H high-temperature seals, fitting directly into existing fixtures.
The 125 mm bore features a G1/2 air port and M27x2 rod thread. 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 maximum theoretical force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X30H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X30H replacement — usually within 7-8 hours.