This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X500SH, 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 SI40X500SH
The AirTAC Airtac SI40 Standard Cylinder SI40X500SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X500SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X500SH
- 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 SI40X500SH
The AirTAC SI40X500SH is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 500 mm stroke. It delivers 628 N push force at 0.5 MPa, features a G1/4 port, and includes an -S magnet for CS1-B/DS1-B switches along with a -H Viton seal for 0-150 C high-temperature environments. The direct replacement is the SAI40X500SH, matching the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
Upgrading to the SAI40X500SH retains all ratings but introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X500SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X500SH |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAI40X500SH 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 SAI40X500SH 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 SI40X500SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SI40X500SH Is Used
Long-Stroke Diversion
Executes 500 mm pusher transitions on conveyor lines, utilizing the 628 N force at 0.5 MPa to redirect packages smoothly with external guides preventing side-load wear.
High-Temperature Handling
Operates reliably in 0-150 C environments using the Viton H seal option, moving components through heated zones where standard NBR seals would degrade.
Replacing the Airtac SI40 Standard Cylinder SI40X500SH with the SAI40X500SH
To replace the discontinued SI40X500SH, order the SAI40X500SH direct cylinder, confirming the ISO 15552 interface, 40 mm bore, 500 mm stroke, G1/4 port (PT/G/NPT thread options), and matching mounting accessory. The -S magnet enables CS1-B/DS1-B legacy sensors, while the SAI replacement uses current AirTAC switches. When sizing both ways, neighboring bores offer 982 N (50 mm) or 402 N (32 mm) push at 0.5 MPa. Because this is a 500 mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X500SH
- ✓ 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 SI40X500SH FAQ
Yes, the SI40X500SH is discontinued. The direct replacement is the SAI40X500SH. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 500 mm stroke, 628 N force, G1/4 port, and mounting interface.
The 40 mm bore features a G1/4 air port and M12x1.25 rod thread. 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 max of 128 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X500SH replacement — usually within 7-8 hours.