This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX75SH, 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 SI50 Standard Cylinder SI50AX75SH
The AirTAC Airtac SI50 Standard Cylinder SI50AX75SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX75SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX75SH
- 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 SI50 Standard Cylinder SI50AX75SH
The AirTAC SI50AX75SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX75SH, matching the interface, output, and mounting.
This unit includes a piston magnet (-S) for CS1-B/DS1-B switches, a SUS420J2 stainless rod (-A), and Viton H seals (-H) for 0-150C environments. The SAI upgrade features two Y-shaped piston seals for low start-up pressure.
Airtac SI50 Standard Cylinder SI50AX75SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX75SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX75SH |
| Bore size | Ø50 mm |
| Stroke | 75 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50AX75SH carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50AX75SH produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50AX75SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50 Standard Cylinder SI50AX75SH Is Used
Hot-End Part Ejection
Leveraging the Viton H high-temperature seals and SUS420J2 stainless rod, this cylinder reliably ejects moulded components in warm environments up to 150C without seal degradation.
Replacing the Airtac SI50 Standard Cylinder SI50AX75SH with the SAI50AX75SH
To replace the SI50AX75SH, order the SAI50AX75SH, confirming the ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port, and magnet. The SAI family adds SAIL, SAIF, and BSAI variants the SI lacked. For sizing, a neighbouring 40mm bore yields 628N push at 0.5MPa, while a 63mm bore gives 1559N. Note that a plain cylinder drifts without live air; use a pilot check valve or SAIL lock to hold loads. The SAI uses current AirTAC switches instead of legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX75SH
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50AX75SH FAQ
Yes, the SI50AX75SH is discontinued. The direct replacement is the SAI50AX75SH. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 75mm stroke, G1/4 port, and mounting interface.
The G1/4 port feeds a 50mm bore generating 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. The cushion only decelerates; it does not hold the load without live air.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX75SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX75SH replacement — usually within 7-8 hours.