This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X250SH, 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 SI125X250SH
The AirTAC SI125 Standard Cylinder SI125X250SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X250SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X250SH
- 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 SI125X250SH
The AirTAC SI125X250SH is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore, 250mm stroke, and a high-temperature Viton H seal. Delivering 6136N push force at 0.5MPa, it is replaced by the SAI125X250SH. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and output force. The SAI features an upgraded piston seal with two Y-shaped elements for low start-up pressure.
With a 32mm rod and M27x2 thread, the original SI accepted CS1-B/DS1-B sensors via its magnet. The Viton H seal extends operating temperature to 0-150C. Note that standard cylinders drift without live air; for load holding, use the SAIL lock or BSAI clamp-lock variant.
Airtac SI125 Standard Cylinder SI125X250SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X250SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X250SH |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAI125X250SH 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 SAI125X250SH 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 SI125X250SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SI125X250SH Is Used
Heavy Stamping
Drives large press tools with 6136N push force at 0.5MPa, utilizing the adjustable 40mm cushions to absorb high kinetic energy at stroke ends.
High-Tact Clamping
Secures hot workpieces using the Viton H high-temperature seal rated for 0-150C, maintaining grip in thermally demanding manufacturing zones.
Replacing the Airtac SI125 Standard Cylinder SI125X250SH with the SAI125X250SH
To replace the SI125X250SH, order the SAI125X250SH. It is a direct per ISO 15552 interface dimensions, matching the 125mm bore, 250mm stroke, G1/2 port, and M27x2 rod thread. Retain your existing mounting accessories and CS1-B/DS1-B sensors, though the SAI family uses current AirTAC switches. If you need less force, the 100mm bore offers 3927N push at 0.5MPa; for more power, the 160mm bore yields 10053N. At 250mm stroke, side-load and rod-bending risks are moderate, so guide the load to prevent premature seal wear. Remember that a standard cylinder does not hold load without air; for locking needs, explore the SAIL or BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X250SH
- ✓ 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 SI125X250SH FAQ
Yes, the SI125X250SH is discontinued. The direct replacement is the SAI125X250SH. It shares the identical ISO 15552 mounting interface, 125mm bore, 250mm stroke, output force, G1/2 port, and accessories, fitting directly into existing fixtures.
This 125mm bore cylinder has a G1/2 air port. Force ratings are: 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical maximum of 1251kgf at 1.0MPa. Operating speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X250SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X250SH replacement — usually within 7-8 hours.