This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX50SH, 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 SI40AX50SH
The AirTAC Airtac SI40 Standard Cylinder SI40AX50SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX50SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX50SH
- 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 SI40AX50SH
The AirTAC SI40AX50SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 50mm stroke. Featuring a SUS420J2 stainless piston rod and Viton H seals for 0-150C high-temp environments, it delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40AX50SH, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40AX50SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX50SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX50SH |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAI40AX50SH 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 SAI40AX50SH 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 SI40AX50SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SI40AX50SH Is Used
High-Temp Ejectors
Ideal for pushing parts out of heated molds or ovens where the Viton H seal and SUS420J2 stainless rod withstand 150C ambient temperatures.
Diverting Gates
Short 50mm stroke provides rapid actuation of routing flaps on packaging lines, utilizing the 628N push force at 0.5MPa.
Product Stopping
Deploys a physical stop block for boxes on a gravity roller conveyor, safely handling loads up to the 32kg vertical lift threshold.
Replacing the Airtac SI40 Standard Cylinder SI40AX50SH with the SAI40AX50SH
To replace this SI40AX50SH, order the SAI40AX50SH. Verify the ISO 15552 mounting interface, 50mm stroke, G1/4 port, and your specific -A SUS420J2 rod, -S magnet, and -H Viton seal options. The 40mm bore yields 628N push at 0.5MPa; if undersized, the 50mm bore offers 982N. For load holding, note a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variant. The 50mm stroke is short, so side-load risks are minimal, but ensure rod alignment to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX50SH
- ✓ 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 SI40AX50SH FAQ
Yes, the AirTAC SI40AX50SH is discontinued. The direct replacement is the SAI40AX50SH. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 50mm stroke, G1/4 port, and mounting fixtures exactly, but features an upgraded piston seal.
This double-acting cylinder has 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 max of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX50SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX50SH replacement — usually within 7-8 hours.