This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX750, 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 SI50AX750
The AirTAC Airtac SI50 Standard Cylinder SI50AX750 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 750mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX750, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX750
- 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 SI50AX750
The AirTAC SI50AX750 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 750mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50AX750. This direct upgrade matches the exact ISO 15552 mounting interface, bore, stroke, force and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S), so it cannot take a CS1-B/DS1-B sensor. The -A code denotes a SUS420J2 stainless rod. For load holding, use the SAIL or BSAI lock variant, as cushions only decelerate.
Airtac SI50 Standard Cylinder SI50AX750 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX750 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX750 |
| Bore size | Ø50 mm |
| Stroke | 750 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 SAI50AX750 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 SAI50AX750 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 SI50AX750
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×750 | 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 SI50AX750 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 750mm reach, utilizing the 982N thrust at 0.5MPa to overcome guide friction.
Stainless Rod Actuation
Drives tooling in mildly corrosive environments using the SUS420J2 stainless piston rod option for enhanced resistance.
Replacing the Airtac SI50 Standard Cylinder SI50AX750 with the SAI50AX750
To replace the SI50AX750, order the SAI50AX750. Confirm the ISO 15552 mounting interface, 50mm bore, 750mm stroke, G1/4 port (PT/G/NPT), and your mounting accessory. This non-magnet SKU cannot accept a sensor; if sensing is needed, order an SAI50X750S. Sizing both ways: a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. At 750mm stroke, prevent rod bending by guiding the load externally. A plain cylinder drifts on air loss; for held loads use the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX750
- ✓ 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 SI50AX750 FAQ
Yes, the SI50AX750 is discontinued. The direct replacement is the SAI50AX750. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 750mm stroke, output force, G1/4 port, and mounting interface.
It has a 20mm rod, M16x1.5 thread, 30mm cushion, and operates at 30-800mm/s. Forces are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX750
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX750 replacement — usually within 7-8 hours.