This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX150, 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 SI50AX150
The AirTAC Airtac SI50 Standard Cylinder SI50AX150 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX150, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX150
- 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 SI50AX150
The AirTAC SI50AX150 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 150mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX150, matching the exact bore, stroke, output, and mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet, so it cannot accept a sensor. The -A rod specifies SUS420J2 stainless steel for corrosion resistance.
Airtac SI50 Standard Cylinder SI50AX150 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX150 |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAI50AX150 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 SAI50AX150 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 SI50AX150
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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 SI50AX150 Is Used
Carton Diverting
Uses the 982N push force at 0.5MPa to push heavy cardboard cartons cleanly across transfer plates without stalling.
Pallet Stopper
Acts as a 150mm stroke pneumatic stop for medium-duty pallets, with the SUS420J2 stainless rod resisting humidity.
Clamp Actuator
Provides reliable clamping pressure for machining fixtures, safely holding workloads near the 589N safe working limit.
Replacing the Airtac SI50 Standard Cylinder SI50AX150 with the SAI50AX150
To replace the SI50AX150, order the SAI50AX150. Confirm the ISO 15552 interface, 150mm stroke, G1/4 port, and your mounting accessory (LB, FA, TC, etc.). Because this SKU lacks a magnet, it cannot take a switch; order a -S variant if you need CS1-B/DS1-B sensing. For sizing, the 50mm bore yields 982N push at 0.5MPa; drop to a 40mm bore for 628N, or step up to 63mm for 1559N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding. The SUS420J2 rod suits humid settings.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX150
- ✓ 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 SI50AX150 FAQ
Yes, the SI50AX150 is discontinued. The direct replacement is the SAI50AX150. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 150mm stroke, G1/4 port, and mounting fixtures.
The G1/4 port feeds a 50mm bore that yields 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a 200kgf max at 1.0MPa. The cushion only decelerates; it does not hold the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX150 replacement — usually within 7-8 hours.