This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200N, 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 SI125X200N
The AirTAC SI125 Standard Cylinder SI125X200N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X200N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X200N
- 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 SI125X200N
The AirTAC SI125X200N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 200 mm stroke, delivering 6136 N push force at 0.5 MPa. AirTAC replaced this end-of-line unit with the SAI125X200N, a direct replacement sharing the exact ISO 15552 mounting interface, G1/2 port, and output force. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This legacy SKU lacks a magnet (-S) and therefore cannot accept position sensors like the CS1-B/DS1-B switches used on magnetized versions.
This NBR-sealed model operates from -20 to +70 C, though a Viton H seal option extends this to 150 C. Note that a standard cylinder drifts without live air; the cushion only decelerates the load near stroke end. For secure holding, consider the SAIL lock or BSAI clamp-lock variants.
Airtac SI125 Standard Cylinder SI125X200N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200N |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAI125X200N 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 SAI125X200N 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 SI125X200N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SI125X200N Is Used
Heavy-Duty Pressing
Drives large stamping and forming fixtures requiring substantial thrust, utilizing the 6136 N push force at 0.5 MPa to seat heavy components securely.
Large Clamp Actuation
Actuates oversized machining clamps holding bulky castings, relying on the rigid 32 mm piston rod and ISO 15552 profile barrel to resist deflection.
Replacing the Airtac SI125 Standard Cylinder SI125X200N with the SAI125X200N
To replace the discontinued SI125X200N, order the SAI125X200N. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/2 air port, and the 200 mm stroke. Because this specific SKU lacks a magnet, it cannot support legacy CS1-B/DS1-B sensors; if position detection is required, select an SAI125X200NS instead. The 125 mm bore yields 6136 N push at 0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N, whereas a 160 mm bore offers 10053 N. Remember that a plain double-acting cylinder does not hold loads without constant air pressure—the adjustable 40 mm cushions only decelerate the piston. For load-holding upon air loss, use an external pilot check valve or explore the SAIL or BSAI locking variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200N
- ✓ 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 SI125X200N FAQ
Yes, the SI125X200N is discontinued. The direct replacement is the SAI125X200N. It shares the identical ISO 15552 mounting interface, 125 mm bore, 200 mm stroke, G1/2 port, and force ratings, fitting directly into existing fixtures.
The bore features a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200N replacement — usually within 7-8 hours.