This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X850SH, 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 SI125X850SH
The AirTAC SI125 Standard Cylinder SI125X850SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 850mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X850SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X850SH
- 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 SI125X850SH
The AirTAC SI125X850SH is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 850mm stroke. Delivering 6136N push force at 0.5MPa through a G1/2 port, it is directly replaced by the SAI125X850SH. This direct upgrade shares identical mounting, force, and interface dimensions.
The SAI successor features an upgraded piston seal with two Y-shaped elements for low start-up pressure. For high-temperature environments, the H seal option extends operation to 150C.
Airtac SI125 Standard Cylinder SI125X850SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X850SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X850SH |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAI125X850SH 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 SAI125X850SH 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 SI125X850SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SI125X850SH Is Used
Heavy Stamp Press Feed
Drives robust 313kg vertical tooling loads in automated metal stamping lines, utilizing the full 6136N thrust at 0.5MPa.
Pallet Lift Stations
Raises heavy industrial pallets over the 850mm stroke, where external guides prevent rod bending on long traverses.
High Temp Actuation
Operates reliably in heated zones up to 150C using the Viton H seal option for demanding manufacturing environments.
Replacing the Airtac SI125 Standard Cylinder SI125X850SH with the SAI125X850SH
To replace the SI125X850SH, order the SAI125X850SH, confirming the ISO 15552 mounting, 850mm stroke, and G1/2 port. The S magnet works with legacy CS1-B/DS1-B switches, while the SAI uses current sensors. For loads needing holding without air, use a pilot check valve or SAIL lock variant, as cushions only decelerate. At 850mm, prevent rod bending by using external guides. Neighboring bores: 100mm gives 3927N, 160mm gives 10053N at 0.5MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X850SH
- ✓ 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 SI125X850SH FAQ
Yes, the SI125X850SH is discontinued. The direct replacement is the SAI125X850SH. It shares the same ISO 15552 mounting interface, 125mm bore, 850mm stroke, force, and G1/2 port, fitting existing fixtures perfectly.
It features a G1/2 port and M27x2 rod thread. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, with a theoretical max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X850SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X850SH replacement — usually within 7-8 hours.