This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X30H, 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 SI40X30H
The AirTAC Airtac SI40 Standard Cylinder SI40X30H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X30H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X30H
- 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 SI40X30H
The AirTAC SI40X30H is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 30mm stroke. Built for high-temperature duty with a Viton H seal (0 to 150 C), it delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X30H, a direct upgrade sharing the exact ISO 15552 mounting interface, M12x1.25 rod thread, and 27mm cushions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SKU lacks a magnet (-S) and therefore cannot accept position sensors.
Airtac SI40 Standard Cylinder SI40X30H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X30H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X30H |
| Bore size | Ø40 mm |
| Stroke | 30 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 SAI40X30H 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 SAI40X30H 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 SI40X30H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SI40X30H Is Used
High-Temperature Ejection
Short-stroke ejection of molded parts from hot zones, leveraging the Viton H seal to withstand 150 C ambient heat.
Compact Clamping
Applying 628N of clamping force in tight machining cells where the 30mm stroke and ISO 15552 footprint fit existing jigs.
Valve Actuation
Switching process valves in thermal environments, using the M12x1.25 rod thread for secure mechanical linkage.
Replacing the Airtac SI40 Standard Cylinder SI40X30H with the SAI40X30H
To replace the discontinued SI40X30H, order the SAI40X30H. It drops directly into existing ISO 15552 fixtures without modification, matching the 40mm bore, 30mm stroke, G1/4 port, and Viton H high-temperature seal. Because this non-magnetic SKU cannot host a sensor, if you need position detection you must select an SAI40X30HS equivalent. For sizing alternatives, a neighboring 32mm bore yields 402N push at 0.5MPa, while a 50mm bore provides 982N. A plain cylinder will not hold a load on air loss—the cushion only decelerates—so for suspended loads use an external pilot check valve or the SAIL/BSAI lock variants. The SAIF variant integrates a 4M valve if space is tight.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X30H
- ✓ 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 SI40X30H FAQ
Yes, the AirTAC SI40X30H is discontinued. The direct replacement is the SAI40X30H. It shares the identical ISO 15552 mounting interface, 40mm bore, 30mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly while upgrading the piston seal.
This 40mm bore cylinder features a G1/4 air port and an M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, with a theoretical maximum of 128kgf at 1.0MPa. It operates at speeds of 30-800mm/s.
Request a Quote for the SAI40X30H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X30H replacement — usually within 7-8 hours.