This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150SN, 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 SI40X150SN
The AirTAC Airtac SI40 Standard Cylinder SI40X150SN 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 SAI40X150SN, 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 → SAI40X150SN
- 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 SI40X150SN
The AirTAC SI40X150SN is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 150mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X150SN, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces lock and valve variants the SI lacked, such as SAIL and BSAI.
Airtac SI40 Standard Cylinder SI40X150SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150SN |
| 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 SAI40X150SN 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 SAI40X150SN 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 SI40X150SN
| 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 SI40X150SN Is Used
Package Diverting
Pushes light-to-medium cartons on a sorting line using the 628N push force at 0.5MPa, with the 150mm stroke clearing the conveyor belt width.
Clamp Actuation
Secures aluminium extrusions or light sheet metal during CNC milling, providing repeatable 528N pull force for reliable fixture hold.
Stopper Gate
Acts as a pneumatic stop for pallets up to 32kg, using the magnetic piston and CS1-B/DS1-B sensors to confirm gate position.
Replacing the Airtac SI40 Standard Cylinder SI40X150SN with the SAI40X150SN
To replace the SI40X150SN, order the SAI40X150SN direct equivalent. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. The -S magnet works with legacy CS1-B/DS1-B sensors, while the -N denotes the NBR seal (-20 to +70 C; Viton H raises this to 150 C). Sizing both ways: a 32mm bore offers 402N [email protected], while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 150mm stroke, rod bending is low, but ensure proper guide alignment to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150SN
- ✓ 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 SI40X150SN FAQ
Yes, the SI40X150SN is discontinued. The direct replacement is the SAI40X150SN. It shares the same ISO 15552 mounting interface, 40mm bore, 150mm stroke, 628N force, and G1/4 port, fitting existing fixtures perfectly.
The G1/4 port supplies a 628N push and 528N pull at 0.5MPa. At 0.7MPa push is 879N, and 1130N at 0.9MPa. The theoretical maximum force is 128kgf at 1.0MPa, operating at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X150SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150SN replacement — usually within 7-8 hours.