This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700SFA, 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 SI125X700SFA
The AirTAC Airtac SI125 Standard Cylinder SI125X700SFA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X700SFA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X700SFA
- 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 SI125X700SFA
The AirTAC SI125X700SFA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 700 mm stroke, and FA flange mounting. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X700SFA, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, output force, and accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The built-in magnet supports CS1-B/DS1-B sensors, and Viton H seals raise operating temps to 150 C.
Airtac SI125 Standard Cylinder SI125X700SFA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700SFA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700SFA |
| Bore size | Ø125 mm |
| Stroke | 700 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 SAI125X700SFA 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 SAI125X700SFA 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 SI125X700SFA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×700 | 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 SI125X700SFA Is Used
Heavy Machinery Ejection
Provides robust push force to eject heavy finished metal castings from hydraulic press beds in automotive stamping facilities.
Pallet Positioning
Shifts loaded industrial pallets along accumulation lines, utilizing the long 700 mm stroke to clear staging zones completely.
Large Assembly Press
Actuates heavy-duty clamping arms to secure large steel beams during robotic welding and fastening operations.
Replacing the Airtac SI125 Standard Cylinder SI125X700SFA with the SAI125X700SFA
To replace the SI125X700SFA, order the SAI125X700SFA. Verify your ISO 15552 FA flange interface, 125 mm bore, 700 mm stroke, G1/2 port (PT/G/NPT), and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. At 700 mm, prevent rod bending by using an external guide to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700SFA
- ✓ 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 SI125X700SFA FAQ
Yes, the SI125X700SFA is discontinued. The direct replacement is the SAI125X700SFA. It shares the same ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, force, and G1/2 port, fitting your existing fixtures perfectly.
The bore is 125 mm with a G1/2 port. Force ratings are: 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700SFA
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