This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX140S, 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 SI125BX140S
The AirTAC SI125 Standard Cylinder SI125BX140S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX140S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX140S
- 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 SI125BX140S
The AirTAC SI125BX140S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 140 mm stroke. It delivers 6136 N push and 5734 N pull at 0.5 MPa. AirTAC replaced this legacy unit with the SAI125BX140S, a direct sharing the exact ISO 15552 mounting interface, G1/2 port, M27x2 thread, and force ratings. This specific unit features a SUS304 stainless steel rod for corrosion resistance and a built-in magnet for CS1-B/DS1-B sensors.
The upgraded SAI family introduces an advanced piston seal with two Y-shaped one-way elements, ensuring long life and low start-up pressure. Note that a standard cylinder will drift if air is lost; the cushion only decelerates near stroke end. For secure load holding, explore the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125BX140S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX140S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX140S |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125BX140S 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 SAI125BX140S 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 SI125BX140S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125BX140S Is Used
Heavy Press Clamping
Secures large metal workpieces in machining centers using the 6136 N push force, while the SUS304 rod resists coolant corrosion.
Industrial Material Hoists
Drives robust lifting mechanisms on assembly lines, relying on the 125 mm bore and 140 mm stroke for high-thrust cycles.
Replacing the Airtac SI125 Standard Cylinder SI125BX140S with the SAI125BX140S
To replace the SI125BX140S, order the SAI125BX140S. Verify your existing fixture matches the ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, G1/2 port, and M27x2 rod thread. Because this unit has the -S magnet, it supports legacy CS1-B/DS1-B switches, though the SAI replacement uses current AirTAC sensors. If you need to adjust force, a 100 mm bore offers 3927 N push at 0.5 MPa, while a 160 mm bore provides 10053 N. Remember that a plain cylinder does not hold load without live air; for drop protection, specify the SAIL air-released lock, the BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX140S
- ✓ 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 SI125BX140S FAQ
Yes, the AirTAC SI125BX140S is discontinued. The direct replacement is the SAI125BX140S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, output force, G1/2 port, and mounting accessories, fitting directly into existing fixtures.
This 125 mm bore cylinder features a G1/2 air port and M27x2 rod thread. It delivers 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 SAI125BX140S
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