This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X140TC, 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 SI125X140TC
The AirTAC SI125 Standard Cylinder SI125X140TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X140TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X140TC
- 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 SI125X140TC
The AirTAC SI125X140TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 140 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X140TC, matching the exact TC trunnion mounting, output, and interface dimensions.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor; legacy CS1-B/DS1-B switches require the -S version.
Airtac SI125 Standard Cylinder SI125X140TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X140TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X140TC |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125X140TC 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 SAI125X140TC 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 SI125X140TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125X140TC Is Used
Heavy Press Clamping
Secures large metal castings in machining fixtures, utilizing the 6136 N push force at 0.5 MPa to hold components firmly against cutting forces.
Pallet Dispenser
Actuates heavy empty pallet magazines in automated distribution lines, where the TC trunnion mount absorbs lateral stresses during lateral load transfers.
Injection Mold Ejection
Drives robust ejection plates out of large plastic molding machinery, requiring the 125 mm bore's 5734 N pull force to overcome mold friction.
Replacing the Airtac SI125 Standard Cylinder SI125X140TC with the SAI125X140TC
To replace the SI125X140TC, order the SAI125X140TC. Confirm the ISO 15552 TC trunnion mount, 125 mm bore, 140 mm stroke, G1/2 port, and M27x2 rod thread. This non-magnet model cannot accept a sensor; choose an SAI with the -S suffix if CS1-B/DS1-B detection is needed. The 125 mm bore yields 6136 N push at 0.5 MPa; sizing down to 100 mm drops this to 3927 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL lock variant to hold loads. At 140 mm, side-load risk is low, but ensure guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X140TC
- ✓ 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 SI125X140TC FAQ
Yes, the SI125X140TC is discontinued. The direct replacement is the SAI125X140TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 140 mm stroke, G1/2 port, TC mount, and force output. You simply order the SAI equivalent.
The 125 mm bore 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, 11045 N push at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. The cylinder operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X140TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X140TC replacement — usually within 7-8 hours.