This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX120SH, 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 SI125BX120SH
The AirTAC SI125 Standard Cylinder SI125BX120SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 120mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX120SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX120SH
- 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 SI125BX120SH
The AirTAC SI125BX120SH is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 120 mm stroke. It delivers 6136 N push force at 0.5 MPa. This specific configuration includes a SUS304 stainless piston rod (-B) for corrosion resistance and a Viton H seal (-H) for high-temperature operation up to 150 C. It features a G1/2 port, M27x2 rod thread, and a 40 mm adjustable air cushion. The direct replacement is the SAI125BX120SH.
The SAI125BX120SH maintains the same ISO 15552 mounting interface, bore, stroke, and force, fitting existing fixtures perfectly. The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125BX120SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX120SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX120SH |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAI125BX120SH 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 SAI125BX120SH 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 SI125BX120SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SI125BX120SH Is Used
Heavy Stamping
Drives large presses and stamping dies requiring high thrust, utilizing the 6136 N push force at 0.5 MPa with a robust 32 mm SUS304 rod.
High-Temp Handling
Manages actuators in hot environments up to 150 C using the Viton H seal, ideal for foundry conveyors or drying ovens.
Replacing the Airtac SI125 Standard Cylinder SI125BX120SH with the SAI125BX120SH
To replace the SI125BX120SH, order the SAI125BX120SH. Verify the ISO 15552 mounting interface, 120 mm stroke, G1/2 port, and your specific -B SUS304 rod and -H Viton high-temp seal options. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. If sizing up or down, neighboring bores are 100 mm and 160 mm; at 0.5 MPa, the 100 mm offers 3927 N push while the 160 mm provides 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. Speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX120SH
- ✓ 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 SI125BX120SH FAQ
Yes, the AirTAC SI125BX120SH is discontinued. The direct replacement is the SAI125BX120SH. It is dimensionally interchangeable per ISO 15552, keeping the same 125 mm bore, 120 mm stroke, G1/2 port, and mounting interface.
The bore is 125 mm with a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 N pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX120SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX120SH replacement — usually within 7-8 hours.