This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX30, 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 SI50AX30
The AirTAC Airtac SI50 Standard Cylinder SI50AX30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX30
- 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 SI50AX30
The AirTAC SI50AX30 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 30mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, utilizing a G1/4 port and an M16x1.5 rod thread. AirTAC replaced this legacy unit with the SAI50AX30, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. The -A designation indicates a SUS420J2 stainless steel piston rod for corrosion resistance.
Airtac SI50 Standard Cylinder SI50AX30 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX30 |
| Bore size | Ø50 mm |
| Stroke | 30 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 SAI50AX30 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 SAI50AX30 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 SI50AX30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SI50AX30 Is Used
Short-Stroke Ejection
Ideal for pushing parts out of a machining fixture using a compact 30mm stroke with 982 N of force at 0.5 MPa.
Corrosive-Sort Gating
The SUS420J2 stainless rod (-A) handles diverting or gating components in washdown or mildly corrosive environments.
Light Pressing
Provides reliable downward clamping or pressing force up to 1374 N at 0.7 MPa for small assembly operations.
Replacing the Airtac SI50 Standard Cylinder SI50AX30 with the SAI50AX30
To replace the discontinued SI50AX30, order the SAI50AX30 and confirm the ISO 15552 mounting interface, 50mm bore, 30mm stroke, G1/4 port, and your specific mounting accessory. This unit has no -S magnet, so it cannot support position sensing; if switches are needed, select an SAI50X30S. Sizing alternatives: a 40mm bore yields 628 N push at 0.5 MPa, while a 63mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. The SUS420J2 rod (-A) suits humid environments.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX30
- ✓ 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 SI50AX30 FAQ
Yes, the SI50AX30 is discontinued. The direct replacement is the SAI50AX30, which shares the identical ISO 15552 mounting interface, 50mm bore, 30mm stroke, output force, and G1/4 port.
It features a G1/4 port and generates 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50AX30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX30 replacement — usually within 7-8 hours.