This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150SFTC, 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 SI40X150SFTC
The AirTAC Airtac SI40 Standard Cylinder SI40X150SFTC 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 SAI40X150SFTC, 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 → SAI40X150SFTC
- 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 SI40X150SFTC
The AirTAC SI40X150SFTC is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 150 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X150SFTC, sharing the identical FTC trunnion mount, M12x1.25 rod thread, and output force.
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 introduces SAIL, SAIF, and BSAI lock variants absent from the legacy SI line.
Airtac SI40 Standard Cylinder SI40X150SFTC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150SFTC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150SFTC |
| 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 SAI40X150SFTC 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 SAI40X150SFTC 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 SI40X150SFTC
| 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 SI40X150SFTC Is Used
Package Diversion
Actuates routing gates on packaging lines where 628 N push at 0.5 MPa easily handles carton weight over a 150 mm travel.
Small Part Clamping
Secures lighter workpieces during machining using the FTC trunnion mount for precise pivoting alignment.
Replacing the Airtac SI40 Standard Cylinder SI40X150SFTC with the SAI40X150SFTC
To replace the SI40X150SFTC, order the SAI40X150SFTC. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 40 mm bore, 150 mm stroke, G1/4 port, and FTC trunnion accessory. The built-in magnet (-S) works with legacy CS1-B/DS1-B sensors, though the SAI uses current AirTAC switches. If you need more force, the 50 mm bore offers 982 N push at 0.5 MPa; if less is required, the 32 mm bore provides 402 N. Remember, a standard cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150SFTC
- ✓ 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 SI40X150SFTC FAQ
Yes, the SI40X150SFTC is discontinued. The direct replacement is the SAI40X150SFTC. It shares the identical ISO 15552 mounting interface, 40 mm bore, 150 mm stroke, G1/4 port, and FTC trunnion mount, fitting directly into existing fixtures.
The G1/4 port bore delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa. At 0.7 MPa push is 879 N, and 1130 N at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X150SFTC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150SFTC replacement — usually within 7-8 hours.