This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X25TC, 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 SI125X25TC
The AirTAC SI125 Standard Cylinder SI125X25TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X25TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X25TC
- 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 SI125X25TC
The AirTAC SI125X25TC is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 25mm stroke, delivering 6136N push force at 0.5MPa. It uses a G1/2 port. The direct replacement is the SAI125X25TC, matching the interface, TC trunnion mount, and output force exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. For higher heat, Viton H seals raise the limit to 150C.
Airtac SI125 Standard Cylinder SI125X25TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X25TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X25TC |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAI125X25TC 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 SAI125X25TC 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 SI125X25TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SI125X25TC Is Used
Heavy Stamping
Drives large press dies with 6136N push force at 0.5MPa, utilizing the short 25mm stroke for rapid, high-impact actuation.
Clamp Actuation
Secures heavy industrial workpieces using the TC trunnion mount to accommodate pivoting clamping arms on machining cells.
Press Fit Assembly
Applies steady downward pressure for seating large bearings, relying on the 125mm bore's 8590N thrust at 0.7MPa.
Replacing the Airtac SI125 Standard Cylinder SI125X25TC with the SAI125X25TC
To replace the SI125X25TC, order the SAI125X25TC and confirm the ISO 15552 TC trunnion mounting, G1/2 port, and 25mm stroke. This non-magnet version cannot hold a position switch. If sizing up or down, neighboring bores are 100mm (3927N push @0.5MPa) and 160mm (10053N push @0.5MPa). A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 32mm rod and M27x2 thread handle high side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X25TC
- ✓ 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 SI125X25TC FAQ
Yes, the SI125X25TC is discontinued. The direct replacement is the SAI125X25TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 25mm stroke, G1/2 port, TC mount, and output force.
The G1/2 port feeds a 32mm rod. Forces are: push 6136N and pull 5734N at 0.5MPa, push 8590N at 0.7MPa, push 11045N at 0.9MPa, and a theoretical max of 1251kgf at 1.0MPa. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X25TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X25TC replacement — usually within 7-8 hours.