This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX105, 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 SI125AX105
The AirTAC SI125 Standard Cylinder SI125AX105 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 105mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125AX105, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125AX105
- 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 SI125AX105
The AirTAC SI125AX105 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 105 mm stroke. It features a 32 mm SUS420J2 stainless steel rod (the -A option) and delivers 6136 N of push force at 0.5 MPa. The direct replacement is the SAI125AX105, which matches the exact G1/2 port, M27x2 thread, and ISO 15552 mounting interface. This SKU lacks a magnet, so it cannot accept position switches.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. If your fixture requires heat, Viton H seals raise the operating range to 150 C.
Airtac SI125 Standard Cylinder SI125AX105 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX105 |
| Bore size | Ø125 mm |
| Stroke | 105 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 SAI125AX105 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 SAI125AX105 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 SI125AX105
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×105 | 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 SI125AX105 Is Used
Heavy-Duty Pressing
Applies up to 11045 N of thrust at 0.9 MPa for seating bearings, stamping heavy plates, or forming thick-gauge metal components.
Injection Mold Clamping
Uses the SUS420J2 stainless rod to resist moisture while providing high-force clamping on large plastic injection molding machinery.
Replacing the Airtac SI125 Standard Cylinder SI125AX105 with the SAI125AX105
To replace this SI cylinder, order the SAI125AX105. Verify your existing fixture's ISO 15552 mounting dimensions, the G1/2 air port, and the M27x2 rod thread. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if you require position detection, select an SAI125AX105S. For sizing alternatives, dropping to an 80 mm bore yields 2513 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. Note that a standard cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 105 mm stroke is short enough to avoid rod-bending concerns, but always guide the load to prevent side forces.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX105
- ✓ 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 SI125AX105 FAQ
Yes, the SI125AX105 is discontinued. The direct replacement is the SAI125AX105. It is dimensionally interchangeable per ISO 15552, maintaining the same 125 mm bore, 105 mm stroke, G1/2 port, and mounting interface.
It delivers 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. The operating speed range is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX105 replacement — usually within 7-8 hours.