This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X160STC, 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 SI125X160STC
The AirTAC SI125 Standard Cylinder SI125X160STC 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 SAI125X160STC, 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 → SAI125X160STC
- 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 SI125X160STC
The AirTAC SI125X160STC is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa through a 125 mm bore and 160 mm stroke. It features a G1/2 port, M27x2 rod thread, and a TC trunnion mount. AirTAC replaced this legacy unit with the SAI125X160STC, a direct sharing the exact interface, force, and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note the cushion only decelerates; explore the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X160STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X160STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X160STC |
| 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 SAI125X160STC 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 SAI125X160STC 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 SI125X160STC
| 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 SI125X160STC Is Used
Heavy Press Clamping
Applies 6136 N of clamping thrust at 0.5 MPa to secure large steel fabrications during robotic welding or heavy machining operations.
Injection Mold Ejection
Delivers robust ejection force with adjustable 40 mm air cushions at both ends to smoothly decelerate the 32 mm rod at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X160STC with the SAI125X160STC
To replace the SI125X160STC, order the SAI125X160STC ensuring the TC trunnion mounting, 125 mm bore, 160 mm stroke, G1/2 port, and -S magnet are retained. The SAI family adds SAIL (air-released lock) and BSAI (clamp-lock) variants the SI lacked. For sizing alternatives, dropping to an 80 mm bore yields 2513 N push at 0.5 MPa, while stepping up to 160 mm provides 10053 N. A plain cylinder drifts on air loss; use an external rod lock or pilot check valve for held loads. At 160 mm stroke, rod bending is low, but for strokes over 300 mm add a guide to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X160STC
- ✓ 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 SI125X160STC FAQ
Yes, the SI125X160STC is discontinued. The direct replacement is the SAI125X160STC, which shares the identical ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, G1/2 port, and output force.
This double-acting cylinder has a G1/2 port. It generates 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 SAI125X160STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X160STC replacement — usually within 7-8 hours.