This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75TC, 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 SI125X75TC
The AirTAC SI125 Standard Cylinder SI125X75TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X75TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X75TC
- 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 SI125X75TC
The AirTAC SI125X75TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 75 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X75TC, which shares the exact TC trunnion mount, M27x2 rod thread and 40 mm cushions.
This SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, the plain SI drifts on air loss, but the SAI family adds SAIL lock and BSAI clamp variants. Note this no-magnet SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X75TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75TC |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125X75TC 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 SAI125X75TC 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 SI125X75TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125X75TC Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N of push force at 0.5 MPa with robust 32 mm rod stability.
Automated Clamp Fixture
Secures large fabricated components during machining using the rigid TC trunnion mount to handle high side loads.
Replacing the Airtac SI125 Standard Cylinder SI125X75TC with the SAI125X75TC
To replace the SI125X75TC, order the SAI125X75TC. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 75 mm stroke, G1/2 port and TC trunnion mounting. Because this SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. If you need position sensing, select the SAI125X75TCS. For sizing alternatives, a 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore offers 10053 N. The 125 mm bore runs at 30-500 mm/s. A plain cylinder does not hold load without live air; for safety against drifting, use an external pilot check valve or explore the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75TC
- ✓ 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 SI125X75TC FAQ
Yes, the SI125X75TC is discontinued. The direct replacement is the SAI125X75TC. It shares the same ISO 15552 mounting interface, 125 mm bore, 75 mm stroke, output force, G1/2 port and TC trunnion mount, fitting existing fixtures perfectly.
The 125 mm bore uses a G1/2 air port. At 0.5 MPa it provides 6136 N push and 5734 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 SAI125X75TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75TC replacement — usually within 7-8 hours.