This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX145, 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 SI40AX145
The AirTAC Airtac SI40 Standard Cylinder SI40AX145 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX145, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX145
- 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 SI40AX145
The AirTAC SI40AX145 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 145 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX145, matching the bore, stroke, force, port, and ISO 15552 mounting interface for existing fixtures.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless piston rod for corrosion resistance. Without a -S suffix, this SKU cannot take a magnetic switch.
Airtac SI40 Standard Cylinder SI40AX145 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX145 |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAI40AX145 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 SAI40AX145 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 SI40AX145
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SI40AX145 Is Used
Clamp Actuation
Provides 628 N of push force at 0.5 MPa, ideal for securing mid-weight aluminum or steel components during machining operations.
Package Diverting
Drives diverting arms on packaging lines with a 145 mm stroke, moving cartons efficiently between parallel conveyor belts.
Replacing the Airtac SI40 Standard Cylinder SI40AX145 with the SAI40AX145
To replace the SI40AX145, order the SAI40AX145. Confirm the ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, G1/4 port, and your specific mounting accessory. The SAI family adds SAIL, SAIF, and BSAI lock or valve variants the SI lacked. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. This SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or SAIL/BSAI variant. For this 145 mm stroke, guide external rods to prevent side-load bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX145
- ✓ 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 SI40AX145 FAQ
Yes, the AirTAC SI40AX145 is discontinued. The direct replacement is the SAI40AX145. It shares the identical ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, force, and G1/4 port, fitting existing fixtures perfectly.
It features a G1/4 air port. Force ratings are 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 maximum of 128 kgf at 1.0 MPa. The cushion only decelerates; it does not hold the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX145 replacement — usually within 7-8 hours.