This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X160SFA, 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 SI125X160SFA
The AirTAC SI125 Standard Cylinder SI125X160SFA 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 SAI125X160SFA, 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 → SAI125X160SFA
- 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 SI125X160SFA
The AirTAC SI125X160SFA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 160 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X160SFA, a direct upgrade retaining the exact ISO 15552 mounting interface, FA flange, and M27x2 rod thread.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that plain SI/SAI cylinders drift without live air; the cushion only decelerates. For held loads, explore the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X160SFA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X160SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X160SFA |
| 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 SAI125X160SFA 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 SAI125X160SFA 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 SI125X160SFA
| 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 SI125X160SFA Is Used
Heavy Press Operations
Drives substantial pressing and forming actions requiring up to 6136 N of thrust at 0.5 MPa, utilizing the 160 mm stroke to actuate heavy tooling.
Large Clamp Actuation
Secures bulky workpieces in automated machining cells, providing 313 kg of vertical lift capacity while using the G1/2 port for high airflow.
Replacing the Airtac SI125 Standard Cylinder SI125X160SFA with the SAI125X160SFA
To replace the SI125X160SFA, order the SAI125X160SFA. Verify your ISO 15552 FA flange mounting, 160 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). This 125 mm bore yields 6136 N at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N, or a 100 mm bore gives 3927 N. If more force is required, the 160 mm bore outputs 10053 N. Because the 160 mm stroke is under 300 mm, rod bending is minimal, but always guide external loads. The cylinder will not hold a load without air; use an external pilot check valve or the SAIL lock variant for static holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X160SFA
- ✓ 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 SI125X160SFA FAQ
Yes, the SI125X160SFA is discontinued. The direct replacement is the SAI125X160SFA. It shares the identical ISO 15552 mounting interface, 125 mm bore, 160 mm stroke, G1/2 port, and FA flange, fitting directly into your existing fixtures.
At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X160SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X160SFA replacement — usually within 7-8 hours.