This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X300SH, 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 SI40X300SH
The AirTAC SI40 Standard Cylinder SI40X300SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X300SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X300SH
- 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 SI40X300SH
The AirTAC SI40X300SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 300mm stroke. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X300SH, which maintains the exact same ISO 15552 mounting interface, output force, and accessories for existing fixtures.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -SH configuration includes a high-temperature Viton seal (0-150C) and a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40X300SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X300SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X300SH |
| Bore size | Ø40 mm |
| Stroke | 300 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 SAI40X300SH 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 SAI40X300SH 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 SI40X300SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 SI40X300SH Is Used
Product Diversion
Pushes packages on a 300mm lane shift using a 628N push force, relying on the G1/4 port for rapid cycling.
High-Temp Ejection
Ejects molded parts safely in 0-150C environments using the Viton H seal, with the magnet confirming ejection.
Replacing the Airtac SI40 Standard Cylinder SI40X300SH with the SAI40X300SH
To replace the SI40X300SH, order the SAI40X300SH and verify the ISO 15552 mounting interface, 40mm bore, 300mm stroke, G1/4 port, and your specific mounting accessory. Because this is a 300mm stroke, use an external guide to prevent rod bending and side-load wear. If you need more force, neighboring bores like the 50mm offer 982N push at 0.5MPa. A plain cylinder does not hold load on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL lock and BSAI clamp-lock variants. The SAIF variant adds a built-in 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X300SH
- ✓ 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 SI40X300SH FAQ
Yes, the SI40X300SH is discontinued. The direct replacement is the SAI40X300SH. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 300mm stroke, output force, G1/4 port, and mounting interface.
It 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. Operating speed is 30-800 mm/s. The G1/4 port and 27mm adjustable cushion govern these dynamics.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X300SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X300SH replacement — usually within 7-8 hours.