This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X5TC, 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 SI125X5TC
The AirTAC SI125 Standard Cylinder SI125X5TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 5mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X5TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke5 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X5TC
- 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 SI125X5TC
The AirTAC SI125X5TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 5 mm stroke, delivering 6136 N push force at 0.5 MPa. It featured a G1/2 port, M27x2 rod thread, and a TC trunnion mount. Because this legacy unit lacks a magnet (-S), it cannot accept position sensors.
Order the SAI125X5TC as the direct replacement. It shares the same ISO 15552 mounting interface, bore, stroke, and port, but adds an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure.
Airtac SI125 Standard Cylinder SI125X5TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X5TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X5TC |
| Bore size | Ø125 mm |
| Stroke | 5 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 SAI125X5TC 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 SAI125X5TC 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 SI125X5TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×5 | 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 SI125X5TC Is Used
Short-Stroke Clamping
Ideal for high-force brief clamping operations in heavy fixtures, utilizing the 6136 N thrust within a compact 5 mm travel envelope.
Press Ejection
Provides robust ejection force in metal forming lines, where the 125 mm bore and TC trunnion mount handle substantial side loads.
Heavy Positioning Stops
Acts as a definitive mechanical stop for heavy pallets, delivering immediate resistance without requiring long stroke lengths.
Replacing the Airtac SI125 Standard Cylinder SI125X5TC with the SAI125X5TC
To replace the SI125X5TC, specify the SAI125X5TC and confirm the ISO 15552 TC trunnion mount, G1/2 port, and 5 mm stroke. Since this SKU lacks a magnet, it cannot support switches; if sensing is needed, order an SAI125X5 model with the S suffix for CS1-B/DS1-B compatibility. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; a smaller 100 mm bore offers 3927 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X5TC
- ✓ 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 SI125X5TC FAQ
Yes, the SI125X5TC is discontinued. The direct replacement is the SAI125X5TC. It shares the same ISO 15552 mounting interface, 125 mm bore, 5 mm stroke, output force, G1/2 port, and TC trunnion mount, fitting directly into existing fixtures.
The 125 mm bore uses a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, at 0.9 MPa it is 11045 N, and the theoretical maximum is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X5TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X5TC replacement — usually within 7-8 hours.