This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X145, 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 SI40X145
The AirTAC Airtac SI40 Standard Cylinder SI40X145 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 SAI40X145, 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 → SAI40X145
- 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 SI40X145
The AirTAC SI40X145 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 145mm stroke. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X145, a direct sharing the same interface, force, and mounting fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet, so it cannot take a sensor. The family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X145 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X145 |
| 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 SAI40X145 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 SAI40X145 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 SI40X145
| 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 SI40X145 Is Used
Component Clamping
Secures mid-weight machined parts during milling or drilling, utilizing the 628N push force at 0.5MPa for rigid workholding.
Package Diverting
Actuates routing gates on 40mm bore assembly lines, providing reliable 145mm stroke movement for moderate product sorting.
Replacing the Airtac SI40 Standard Cylinder SI40X145 with the SAI40X145
To replace the SI40X145, order the SAI40X145. Confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G, or NPT), and the M12x1.25 rod thread. Because this specific SKU has no -S magnet, it cannot accept position switches; if you need sensing, select an SAI40X145S and use current AirTAC sensors. For sizing, a 32mm bore gives 402N push at 0.5MPa, while a 50mm bore gives 982N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider the SAIL lock, BSAI clamp-lock, or an external pilot check valve. At 145mm stroke, side-load risks are low, but ensure alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X145
- ✓ 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 SI40X145 FAQ
Yes, the SI40X145 is discontinued. The direct replacement is the AirTAC SAI40X145. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 145mm stroke, 628N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. It operates at 30-800mm/s with a 27mm adjustable air cushion.
Request a Quote for the SAI40X145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X145 replacement — usually within 7-8 hours.