This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X90TC, 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 SI125X90TC
The AirTAC SI125 Standard Cylinder SI125X90TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 90mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X90TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X90TC
- 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 SI125X90TC
The AirTAC SI125X90TC is a discontinued double-acting ISO 15552 profile cylinder, delivering 6136 N push force at 0.5 MPa through a 125 mm bore and 90 mm stroke. It features a G1/2 port, M27x2 rod thread, and 40 mm adjustable air cushions. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI125X90TC.
The SAI upgrade retains the identical ISO 15552 mounting interface, TC trunnion, output force, and port size, fitting existing fixtures perfectly. It introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Note this non-S SKU lacks a magnet and cannot accept a sensor.
Airtac SI125 Standard Cylinder SI125X90TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X90TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X90TC |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAI125X90TC 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 SAI125X90TC 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 SI125X90TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SI125X90TC Is Used
Heavy Press Clamping
Provides 6136 N of thrust at 0.5 MPa to secure heavy steel plates during machining or stamping operations.
Pallet Lift Gates
Actuates large loading dock scissor lifts, moving loads safely up to the 313 kg vertical lift threshold.
Mold Ejection Systems
Drives robust ejection pins in injection molding lines, utilizing the 40 mm adjustable cushions to soften impacts.
Replacing the Airtac SI125 Standard Cylinder SI125X90TC with the SAI125X90TC
To replace the discontinued SI125X90TC, order the SAI125X90TC. Confirm the ISO 15552 TC trunnion mount, 125 mm bore, 90 mm stroke, G1/2 port, and M27x2 thread. If downsizing, a 100 mm bore yields 3927 N at 0.5 MPa; if upsizing, a 160 mm bore provides 10053 N. This plain cylinder does not hold load without live air—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL or BSAI lock variant. Speed is 30-500 mm/s. Since this SKU has no magnet (-S), it cannot take a CS1-B/DS1-B sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X90TC
- ✓ 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 SI125X90TC FAQ
Yes, the SI125X90TC is discontinued. The direct replacement is the SAI125X90TC. It is dimensionally interchangeable per ISO 15552, retaining the same TC mounting interface, 125 mm bore, 90 mm stroke, force, and G1/2 port.
The G1/2 port bore delivers a push of 6136 N and pull of 5734 N at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X90TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X90TC replacement — usually within 7-8 hours.