This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X160FTC, 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 SI125X160FTC
The AirTAC SI125 Standard Cylinder SI125X160FTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 160mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X160FTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke160 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X160FTC
- 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 SI125X160FTC
The AirTAC SI125X160FTC is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel. It delivers 6136 N push force at 0.5 MPa through a 125 mm bore and 160 mm stroke. The direct replacement is the SAI125X160FTC, which preserves the exact FTC trunnion mount, G1/2 port, and M27x2 rod thread.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike the CS1-B/DS1-B switches used on -S models.
Airtac SI125 Standard Cylinder SI125X160FTC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X160FTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X160FTC |
| Bore size | Ø125 mm |
| Stroke | 160 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 SAI125X160FTC 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 SAI125X160FTC 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 SI125X160FTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×160 | 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 SI125X160FTC Is Used
Heavy Press Clamping
Secures large steel plates in a machining center using the 6136 N push force at 0.5 MPa, relying on the rigid FTC trunnion to handle heavy offset loads.
Pallet Diverting
Actuates heavy-duty diverters on a high-throughput packaging line, where the 125 mm bore provides the necessary thrust to shift loaded pallets smoothly.
Replacing the Airtac SI125 Standard Cylinder SI125X160FTC with the SAI125X160FTC
To replace this SI125X160FTC, order the SAI125X160FTC keeping the 125 mm bore, 160 mm stroke, G1/2 port, and FTC trunnion mounting. If sizing both ways, neighboring bores are 100 mm (3927 N push @0.5 MPa) and 160 mm (10053 N push @0.5 MPa). Because this is a non-S SKU, it cannot accept a magnetic sensor. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. If your stroke exceeds 300 mm, add a guide to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X160FTC
- ✓ 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 SI125X160FTC FAQ
Yes, the SI125X160FTC is discontinued. The direct replacement is the SAI125X160FTC. It is dimensionally interchangeable per ISO 15552, offering the same bore, stroke, output force, G1/2 port, and FTC trunnion mount.
This 125 mm bore cylinder has a G1/2 air port. 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. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X160FTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X160FTC replacement — usually within 7-8 hours.