This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX120SH, 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 SI40 Standard Cylinder SI40BX120SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX120SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX120SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX120SH
- 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 SI40 Standard Cylinder SI40BX120SH
The AirTAC SI40BX120SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 120mm stroke, and a SUS304 stainless steel rod. Delivering 628N push force at 0.5MPa, it is directly replaced by the SAI40BX120SH. This direct upgrade matches the original G1/4 port, M12x1.25 thread, and mounting interface, fitting existing fixtures perfectly.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. Your -S magnet supports legacy CS1-B/DS1-B sensors, while the -H Viton seal allows 0-150C operation.
Airtac SI40 Standard Cylinder SI40BX120SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX120SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX120SH |
| Bore size | Ø40 mm |
| Stroke | 120 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40BX120SH carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40BX120SH produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40BX120SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SI40 Standard Cylinder SI40BX120SH Is Used
Stainless Rod Diverters
Actuates routing gates on washdown packaging lines where the SUS304 rod resists moisture and corrosion.
Vertical Lift Stops
Raises 32kg product stops in low-friction vertical material handling setups operating safely under 377N.
High-Temp Clamping
Secures workpieces near drying ovens, utilizing the Viton H seal to withstand ambient heat up to 150C.
Replacing the Airtac SI40 Standard Cylinder SI40BX120SH with the SAI40BX120SH
To replace the SI40BX120SH, order the SAI40BX120SH. Verify your ISO 15552 mounting accessories (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. The -B rod provides SUS304 stainless steel for corrosion resistance, and the -H option specifies Viton seals for high-temperature environments. If you need less force, a 32mm bore offers 402N at 0.5MPa; for more power, a 50mm bore provides 982N. Note that a plain cylinder drifts without live air, as the 27mm cushion only decelerates the load. For secure holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX120SH
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40BX120SH FAQ
Yes, the SI40BX120SH is discontinued. The direct replacement is the SAI40BX120SH. It shares the same ISO 15552 mounting interface, 40mm bore, 120mm stroke, and G1/4 port, fitting directly into your existing fixtures.
It features a G1/4 air port and generates 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, and 1130N at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX120SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX120SH replacement — usually within 7-8 hours.