This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125AX105S, 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 SI125AX105S
The AirTAC SI125 Standard Cylinder SI125AX105S 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 SAI125AX105S, 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 → SAI125AX105S
- 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 SI125AX105S
The AirTAC SI125AX105S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore, 105 mm stroke, and a SUS420J2 stainless steel rod. Delivering 6136 N push force at 0.5 MPa, it is replaced by the SAI125AX105S. This direct upgrade shares the exact ISO 15552 mounting interface, G1/2 port, and M27x2 rod thread, fitting existing fixtures seamlessly.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the broader SAI family adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI125 Standard Cylinder SI125AX105S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125AX105S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125AX105S |
| 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 SAI125AX105S 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 SAI125AX105S 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 SI125AX105S
| 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 SI125AX105S Is Used
Heavy Press Clamping
Generates 6136 N at 0.5 MPa to secure large steel plates during machining, utilizing the SUS420J2 rod to resist coolant corrosion.
Injection Mold Ejection
Delivers up to 1251 kgf theoretical max force at 1.0 MPa to eject dense plastic parts from 125 mm bore molding fixtures.
Replacing the Airtac SI125 Standard Cylinder SI125AX105S with the SAI125AX105S
To replace the SI125AX105S, order the SAI125AX105S. Verify your ISO 15552 mounting accessory (LB, FA, CA, TC), the G1/2 air port, and the -S magnet for current AirTAC switches. The -A rod is SUS420J2 stainless steel; default is carbon steel. Sizing both ways: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that a plain cylinder drifts without live air; the 40 mm cushions only decelerate. For load holding, specify an external pilot check valve or the SAIL/BSAI lock variant. At 105 mm stroke, side-load is minimal, but always guide the rod for heavy 125 mm payloads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125AX105S
- ✓ 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 SI125AX105S FAQ
Yes, the SI125AX105S is discontinued. The direct replacement is the SAI125AX105S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 105 mm stroke, G1/2 port, and mounting interface for a direct fixture swap.
It features a G1/2 air port. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125AX105S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125AX105S replacement — usually within 7-8 hours.