This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150, 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 SI40X150
The AirTAC Airtac SI40 Standard Cylinder SI40X150 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 SAI40X150, 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 → SAI40X150
- 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 SI40X150
The AirTAC SI40X150 is a discontinued double-acting ISO 15552 profile cylinder delivering 628 N push force at 0.5 MPa through a 40 mm bore and 150 mm stroke. AirTAC replaced this legacy unit with the SAI40X150, a direct upgrade retaining the exact G1/4 port, M12x1.25 rod thread and ISO 15552 mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S) and cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X150 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150 |
| 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 SAI40X150 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 SAI40X150 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 SI40X150
| 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 SI40X150 Is Used
Mid-Force Actuation
Drives 40 mm bore clamping arms and small press fixtures with 628 N push force at 0.5 MPa.
Package Diversion
Executes 150 mm stroke routing gates on packaging lines, operating reliably at 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X150 with the SAI40X150
To replace the SI40X150, order the SAI40X150 direct: it matches the ISO 15552 mounting dimensions, 40 mm bore, 150 mm stroke, G1/4 port (PT/G/NPT options) and M12x1.25 rod thread. Because this SKU has no magnet, it cannot support position sensing; order an SAI40X150S if you need CS1-B/DS1-B switch compatibility. When sizing both ways, a neighbouring 50 mm bore offers 982 N push at 0.5 MPa, while dropping to 32 mm yields 402 N. For stroke lengths of 150 mm, ensure adequate guide support to prevent rod bending under side loads. A plain cylinder drifts on air loss—the cushion only decelerates—so add an external rod lock, pilot check valve, or specify the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150
- ✓ 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 SI40X150 FAQ
Yes, the SI40X150 is discontinued. The direct replacement is the AirTAC SAI40X150. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 150 mm stroke, 628 N force, G1/4 port and mounting fixtures.
This double-acting cylinder has a 16 mm rod, M12x1.25 thread, 27 mm cushion and G1/4 port. Force ratings are 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N at 0.9 MPa, and a 128 kgf maximum at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI40X150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150 replacement — usually within 7-8 hours.