This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X150SFA, 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 SI125X150SFA
The AirTAC SI125 Standard Cylinder SI125X150SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X150SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X150SFA
- 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 SI125X150SFA
The AirTAC SI125X150SFA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 150 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X150SFA, a direct upgrade sharing the exact same ISO 15552 mounting interface, FA flange, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL and BSAI lock variants absent in the SI line. The original -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X150SFA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X150SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X150SFA |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAI125X150SFA 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 SAI125X150SFA 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 SI125X150SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SI125X150SFA Is Used
Heavy-Duty Pressing
Applies the 8590 N push force at 0.7 MPa to seat bearings and assemble heavy mechanical components securely.
Pallet Handling
Uses the 313 kg vertical lift capacity to elevate and position loaded pallets within automated distribution centers.
Large Fixture Clamping
Secures oversized fabrication parts using the FA flange mount to withstand machining forces during production.
Replacing the Airtac SI125 Standard Cylinder SI125X150SFA with the SAI125X150SFA
To replace the SI125X150SFA, order the SAI125X150SFA. Verify the ISO 15552 interface, 125 mm bore, 150 mm stroke, G1/2 port, and FA flange mounting. The -S magnet enables position sensing; use current AirTAC switches on the SAI (legacy CS1-B/DS1-B on the SI). If sizing up or down, note the 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. Since the stroke is under 300 mm, side-load risks are minimal, but standard guide calculations still apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X150SFA
- ✓ 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 SI125X150SFA FAQ
Yes, the SI125X150SFA is discontinued. The direct replacement is the SAI125X150SFA. It shares the identical ISO 15552 mounting interface, 125 mm bore, 150 mm stroke, output force, and G1/2 port, fitting directly into existing FA flange fixtures.
The 125 mm bore provides 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X150SFA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X150SFA replacement — usually within 7-8 hours.