This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600SFTC, 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 SI125X600SFTC
The AirTAC SI125 Standard Cylinder SI125X600SFTC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X600SFTC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X600SFTC
- 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 SI125X600SFTC
The AirTAC SI125X600SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 600 mm stroke. Delivering 6136 N push force at 0.5 MPa, it features an extruded aluminum barrel, adjustable air cushions, and an FTC trunnion mount. The direct replacement is the SAI125X600SFTC, matching the exact bore, stroke, G1/2 port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds variants the SI lacked, like the SAIL lock and BSAI clamp-lock. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Rod material options include carbon steel, SUS420J2, or SUS304.
Airtac SI125 Standard Cylinder SI125X600SFTC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600SFTC |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAI125X600SFTC 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 SAI125X600SFTC 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 SI125X600SFTC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | 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 SI125X600SFTC Is Used
Heavy Press Actuation
Drives large platens in automated pressing lines where 6136 N at 0.5 MPa is required to seat or form heavy components securely.
Bulk Pallet Diverting
Handles high-mass pallet routing across 600 mm strokes, utilizing the robust 32 mm rod and FTC trunnion mount to absorb structural shifting.
Replacing the Airtac SI125 Standard Cylinder SI125X600SFTC with the SAI125X600SFTC
To replace the SI125X600SFTC, order the SAI125X600SFTC. Verify the ISO 15552 FTC trunnion mount, 600 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. If downsizing, neighbor bores offer less force; if upsizing, note the 125 mm bore already yields 8590 N at 0.7 MPa. Because a plain cylinder drifts without live air and the cushion only decelerates, use the SAIL or BSAI lock variant, an external rod lock, or a pilot check valve for load holding. The 600 mm stroke demands an external guide to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600SFTC
- ✓ 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 SI125X600SFTC FAQ
Yes, the SI125X600SFTC is discontinued. The direct replacement is the SAI125X600SFTC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 600 mm stroke, output force, G1/2 port, and FTC mounting interface.
This double-acting cylinder uses a G1/2 port. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N push at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa. Speed ranges from 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600SFTC replacement — usually within 7-8 hours.