This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX105, 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 SI125BX105
The AirTAC SI125 Standard Cylinder SI125BX105 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 SAI125BX105, 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 → SAI125BX105
- 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 SI125BX105
The AirTAC SI125BX105 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 105 mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa, utilizing a G1/2 air port and a SUS304 stainless steel piston rod for corrosion resistance. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI125BX105. It matches the original bore, stroke, force, port, and ISO 15552 mounting interface perfectly.
The SAI125BX105 upgrade features a revised piston seal with two Y-shaped one-way elements, ensuring long life and low start-up pressure. Note that this specific SKU lacks a magnet (-S), so it cannot accept a CS1-B or DS1-B sensor. The SAI family also introduces lock variants (SAIL, BSAI) absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX105 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX105 |
| 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 SAI125BX105 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 SAI125BX105 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 SI125BX105
| 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 SI125BX105 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring high thrust, utilizing the 6136 N push force at 0.5 MPa to form thick metal components reliably.
Woodworking Clamp
Secures large timber beams during automated cutting and routing operations, using the robust 125 mm bore to maintain rigid clamping pressure.
Replacing the Airtac SI125 Standard Cylinder SI125BX105 with the SAI125BX105
To replace the discontinued SI125BX105, order the SAI125BX105. Verify your existing fixture's ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 port thread (PT/G/NPT), and the 105 mm stroke. Because this SKU has no magnet (-S), it cannot support position sensing; if you require switches, select an SAI125X105S and use current AirTAC sensors. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if you need less force, a 100 mm bore gives 3927 N, while a 160 mm bore provides 10053 N. Remember that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX105
- ✓ 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 SI125BX105 FAQ
Yes, the AirTAC SI125BX105 is discontinued and end-of-life. The direct replacement is the SAI125BX105. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 105 mm stroke, 6136 N force, G1/2 port, and mounting accessories, so it fits existing fixtures directly.
This double-acting cylinder features a G1/2 air port and an M27x2 rod thread. 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 of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX105 replacement — usually within 7-8 hours.