This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X700SN, 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 SI125X700SN
The AirTAC SI125 Standard Cylinder SI125X700SN 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 SAI125X700SN, 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 → SAI125X700SN
- 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 SI125X700SN
The AirTAC SI125X700SN is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 700 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X700SN, retaining the same interface, force, and mounting. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also adds SAIL, SAIF, and BSAI variants the SI lacked. The NBR seal handles -20 to +70 C, while the magnet works with CS1-B/DS1-B switches.
The SAI family uses current AirTAC switches instead of the legacy CS1-B/DS1-B set. The original SI line is end-of-life; order the SAI125X700SN for an exact ISO 15552 dimensional interchange without altering your fixtures.
Airtac SI125 Standard Cylinder SI125X700SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X700SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X700SN |
| 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 SAI125X700SN 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 SAI125X700SN 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 SI125X700SN
| 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 SI125X700SN Is Used
Heavy Machinery Ejection
Provides robust 6136 N push force to eject heavy finished metal components from machining centers.
Pallet Positioning
Shifts loaded pallets along conveyor lines using the 700 mm stroke and 125 mm bore power.
Replacing the Airtac SI125 Standard Cylinder SI125X700SN with the SAI125X700SN
To replace the discontinued SI125X700SN, order the SAI125X700SN direct equivalent. Confirm the ISO 15552 mounting interface, 125 mm bore, 700 mm stroke, G1/2 port (PT/G/NPT thread options), and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet and -N NBR seal are retained. At 0.5 MPa it yields 6136 N push and 5734 N pull; if undersized, step up to a 160 mm bore. Because 700 mm exceeds 300 mm, add external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X700SN
- ✓ 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 SI125X700SN FAQ
Yes, the AirTAC SI125X700SN is discontinued. The direct replacement is the SAI125X700SN. It is a true ISO 15552 profile cylinder with the same 125 mm bore, 700 mm stroke, 6136 N force, G1/2 port, and mounting interface, dropping directly into existing fixtures.
The bore is 125 mm with a G1/2 port and M27x2 rod thread. At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, at 0.9 MPa it is 11045 N, and the theoretical max is 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X700SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X700SN replacement — usually within 7-8 hours.