This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600TC, 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 SI125X600TC
The AirTAC SI125 Standard Cylinder SI125X600TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X600TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X600TC
- 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 SI125X600TC
The AirTAC SI125X600TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 600 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. Because this legacy unit lacks the -S magnet suffix, it cannot accept a position sensor.
Order the SAI125X600TC as the direct replacement. It shares the same ISO 15552 mounting interface, TC trunnion, and output, but adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure. For load holding, note that the standard cushion only decelerates; you need an external pilot check valve or the SAIL lock variant to prevent drift.
Airtac SI125 Standard Cylinder SI125X600TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600TC |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125X600TC 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 SAI125X600TC 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 SI125X600TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125X600TC Is Used
Heavy Material Lifts
Drives large vertical platform elevators using the 6136 N push force, though an external check valve is required to hold the load safely.
Pallet Diverters
Pushes heavy pallets across transfer lines with a 600 mm stroke, relying on the TC trunnion to absorb lateral moment loads.
Automated Storage Retrieval
Actuates large shuttle mechanisms in ASRS cranes, taking advantage of the 125 mm bore capacity for high thrust requirements.
Replacing the Airtac SI125 Standard Cylinder SI125X600TC with the SAI125X600TC
To replace the SI125X600TC, specify the SAI125X600TC to retain the ISO 15552 TC trunnion mount, 125 mm bore, 600 mm stroke, and G1/2 port. This SKU has no magnet, so if sensing is required you must select an SAI equivalent with the S suffix for current AirTAC switches. At 0.5 MPa it yields 6136 N push and 5734 N pull; if you need less force, step down to an 80 mm bore (2513 N push), or step up to 160 mm (10053 N) for heavier loads. Because the 600 mm stroke is long, use an external guide to prevent rod bending and side-load damage. Finally, the air cushion only decelerates the load; for fail-safe holding against air loss, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600TC
- ✓ 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 SI125X600TC FAQ
Yes, the SI125X600TC is discontinued. The direct replacement is the SAI125X600TC. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 125 mm bore, 600 mm stroke, G1/2 port, and TC trunnion mounting.
The G1/2 port feeds a 32 mm rod. It delivers 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600TC replacement — usually within 7-8 hours.