This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X105, 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 SI125X105
The AirTAC SI125 Standard Cylinder SI125X105 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 SAI125X105, 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 → SAI125X105
- 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 SI125X105
The AirTAC SI125X105 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 105 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X105, matching the interface, bore, stroke, force, port and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot hold a sensor; legacy switches were CS1-B/DS1-B.
Airtac SI125 Standard Cylinder SI125X105 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X105 |
| 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 SAI125X105 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 SAI125X105 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 SI125X105
| 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 SI125X105 Is Used
Heavy Press Clamping
Secures large metal castings during machining operations, utilizing the 6136 N push force to maintain rigid clamping without deflection.
Pallet Lift Gates
Actuates heavy loading dock gates, providing the robust thrust required to elevate palletized goods smoothly against gravity.
Mold Ejection Systems
Drives the ejection plate in large plastic injection molding machines, safely pushing finished parts clear of the mold cavity.
Replacing the Airtac SI125 Standard Cylinder SI125X105 with the SAI125X105
To replace the SI125X105, order the SAI125X105. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 105 mm stroke, and the G1/2 port. Because this SKU lacks the -S magnet, it cannot accept a sensor; if position detection is needed, select an SAI125X105S. For sizing, the 125 mm bore yields 6136 N at 0.5 MPa; a neighbouring 100 mm bore provides 3927 N, while a 160 mm bore offers 10053 N. The cushion only decelerates the load; it does not hold it. For dead-load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X105
- ✓ 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 SI125X105 FAQ
Yes, the SI125X105 is discontinued. The direct replacement is the SAI125X105. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 105 mm stroke, output force, G1/2 port and mounting accessories.
This double-acting cylinder features a G1/2 port. The thrust ratings are 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 maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X105 replacement — usually within 7-8 hours.