This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX150, 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 SI40BX150
The AirTAC Airtac SI40 Standard Cylinder SI40BX150 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX150, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX150
- 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 SI40BX150
The AirTAC SI40BX150 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 150mm stroke, and a SUS304 stainless piston rod. It delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this EOL unit with the SAI40BX150, a direct sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S) and cannot accept a CS1-B/DS1-B sensor.
Airtac SI40 Standard Cylinder SI40BX150 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX150 |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40BX150 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 SAI40BX150 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 SI40BX150
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40BX150 Is Used
Washdown Sorting
Ideal for food or chemical lines using the SUS304 rod to resist corrosion while pushing 628 N at 0.5 MPa to divert packages.
Clamp Actuation
Provides 528 N pull force at 0.5 MPa for holding light alloy parts during machining, with adjustable 27mm cushions for smooth stops.
Replacing the Airtac SI40 Standard Cylinder SI40BX150 with the SAI40BX150
To replace the discontinued SI40BX150, order the SAI40BX150, confirming the ISO 15552 interface, 40mm bore, 150mm stroke, G1/4 port, and SUS304 rod. Because this non-magnetic SKU cannot take a switch, add the -S suffix if you need CS1-B/DS1-B sensing. Sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. At 150mm stroke, rod bending is low, but maintain guide alignment to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX150
- ✓ 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 SI40BX150 FAQ
Yes, the SI40BX150 is discontinued. The direct replacement is the SAI40BX150. It shares the identical ISO 15552 mounting interface, 40mm bore, 150mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly.
The 40mm bore uses a G1/4 port. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX150 replacement — usually within 7-8 hours.