This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X350SH, 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 SI125X350SH
The AirTAC SI125 Standard Cylinder SI125X350SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X350SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X350SH
- 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 SI125X350SH
The AirTAC SI125X350SH is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 350 mm stroke. It delivers 6136 N push force at 0.5 MPa, features a G1/2 port, and includes a high-temp Viton H seal (0-150 C). The direct replacement is the SAI125X350SH.
The SAI upgrade retains the same interface and force but adds a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also introduces SAIL and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X350SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X350SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X350SH |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125X350SH 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 SAI125X350SH 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 SI125X350SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SI125X350SH Is Used
Heavy Press Clamping
Secures large metal castings in machining fixtures, using the 6136 N push force to hold parts firmly against cutting loads.
Pallet Diversion
Actuates heavy-duty lane diverters over a 350 mm travel, shifting loaded pallets between parallel conveyor lines.
Automated Lift Gates
Raises and lowers weighty loading dock gates, where the Viton H seal ensures reliable operation in high-temp environments.
Replacing the Airtac SI125 Standard Cylinder SI125X350SH with the SAI125X350SH
To replace the SI125X350SH, order the SAI125X350SH. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 350 mm stroke, G1/2 port, and M27x2 thread. Retain your mounting accessory and confirm the -S magnet for current AirTAC switches. If downsizing, a 100 mm bore gives 3927 N [email protected]; if upsizing, 160 mm gives 10053 N. For 350 mm strokes, use an external guide to prevent rod bending. A plain cylinder drifts without air; for load holding use the SAIL lock variant or a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X350SH
- ✓ 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 SI125X350SH FAQ
Yes, the AirTAC SI125X350SH is discontinued. The direct replacement is the SAI125X350SH. It features the same ISO 15552 mounting interface, 125 mm bore, 350 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The 125 mm bore provides 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. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X350SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X350SH replacement — usually within 7-8 hours.