This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X350TC, 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 SI125X350TC
The AirTAC SI125 Standard Cylinder SI125X350TC 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 SAI125X350TC, 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 → SAI125X350TC
- 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 SI125X350TC
The AirTAC SI125X350TC 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. AirTAC replaced this legacy unit with the SAI125X350TC, a direct upgrade retaining the exact ISO 15552 mounting interface, TC trunnion mount, G1/2 port, and 1251 kgf maximum force.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors. The SAI family also introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X350TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X350TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X350TC |
| 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 SAI125X350TC 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 SAI125X350TC 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 SI125X350TC
| 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 SI125X350TC Is Used
Heavy Press Clamping
Secures large steel fabrications in a machining center, utilizing the 6136 N push force at 0.5 MPa to hold parts rigidly against cutting loads.
Bulk Material Diversion
Actuates a heavy diverter gate on a packaging line, using the 350 mm stroke to redirect large totes while relying on adjustable end cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X350TC with the SAI125X350TC
To replace the SI125X350TC, order the SAI125X350TC. Confirm the ISO 15552 TC trunnion interface, 350 mm stroke, G1/2 port, and M27x2 rod thread. Because this SKU has no -S magnet, it cannot support position sensing; if you need switches, specify a magnet on the SAI order and use current AirTAC sensors. Operating speed is 30-500 mm/s. For sizing both ways, the 8590 N push at 0.7 MPa handles heavy loads, while a neighbouring 100 mm bore offers a smaller footprint. The 350 mm stroke necessitates external guides to prevent rod bending under side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or choose the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X350TC
- ✓ 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 SI125X350TC FAQ
Yes, the SI125X350TC is discontinued. The direct replacement is the SAI125X350TC. It shares the identical ISO 15552 mounting interface, 125 mm bore, 350 mm stroke, G1/2 port, and TC trunnion mount, fitting existing fixtures perfectly.
The G1/2 port feeds a 32 mm rod. Force outputs are: 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 theoretical maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X350TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X350TC replacement — usually within 7-8 hours.