This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX375, 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 SI40AX375
The AirTAC Airtac SI40 Standard Cylinder SI40AX375 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 375mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX375, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke375 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX375
- 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 SI40AX375
The AirTAC SI40AX375 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 375mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX375, retaining identical interface, force, and mounting dimensions.
This SKU features a SUS420J2 stainless rod but lacks a magnet, so it cannot accept a sensor. The SAI upgrade uses two Y-shaped piston seals for low start-up pressure. Note that the 375mm stroke requires external guides to prevent rod bending.
Airtac SI40 Standard Cylinder SI40AX375 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX375 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX375 |
| Bore size | Ø40 mm |
| Stroke | 375 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 SAI40AX375 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 SAI40AX375 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 SI40AX375
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×375 | 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 SI40AX375 Is Used
Package Diverting
Drives diverting arms on packaging lines, utilizing the 628N push force to redirect cartons at high throughput speeds.
Component Ejection
Ejects machined parts from fixtures, relying on the 27mm adjustable air cushions to decelerate the rod smoothly at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40AX375 with the SAI40AX375
To replace the SI40AX375, order the SAI40AX375, confirming the ISO 15552 mounting, G1/4 port, and 375mm stroke. Because this is a non-magnet SKU, it cannot support legacy CS1-B/DS1-B sensors; order an SAI with the S suffix if sensing is needed. For sizing, a 32mm bore yields 402N at 0.5MPa, while a 50mm bore yields 982N. The 375mm stroke necessitates an external guide to mitigate side-load and rod-bending risks. Finally, this plain cylinder drifts on air loss; use a pilot check valve or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX375
- ✓ 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 SI40AX375 FAQ
Yes, the AirTAC SI40AX375 is discontinued. The direct replacement is the SAI40AX375. It is dimensionally interchangeable per ISO 15552, offering the same 40mm bore, 375mm stroke, 628N force, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port and a 16mm piston rod. Force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX375
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX375 replacement — usually within 7-8 hours.