This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX270, 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 SI50AX270
The AirTAC SI50 Standard Cylinder SI50AX270 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 270mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX270, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke270 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX270
- 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 SI50AX270
The AirTAC SI50AX270 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 270 mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50AX270, matching the interface, force, and stroke exactly. This specific SKU uses an SUS420J2 stainless steel rod (-A) for corrosion resistance but lacks a magnet, meaning it cannot accept position switches.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding, note that cushions only decelerate; use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI50 Standard Cylinder SI50AX270 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX270 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX270 |
| Bore size | Ø50 mm |
| Stroke | 270 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 SAI50AX270 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 SAI50AX270 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 SI50AX270
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×270 | 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 SI50AX270 Is Used
Stainless Rod Clamping
Ideal for machining fixtures requiring corrosion resistance, using the SUS420J2 rod to clamp aluminum parts securely with 982 N of push force.
Transfer Line Diversion
Deploys a 270 mm stroke to push packages between parallel conveyor belts, benefiting from the adjustable air cushions at both ends for smooth stops.
Replacing the Airtac SI50 Standard Cylinder SI50AX270 with the SAI50AX270
To replace the SI50AX270, order the SAI50AX270 to retain the exact ISO 15552 mounting dimensions, 50 mm bore, 270 mm stroke, G1/4 port, and SUS420J2 rod. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. When sizing, a 40 mm bore yields 628 N push at 0.5 MPa, while a 63 mm bore yields 1559 N. For this 270 mm stroke, ensure guide rails support the load to prevent rod bending and side-load wear. If the application requires load holding on air loss, select the SAIL or BSAI lock variant, or add a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX270
- ✓ 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 SI50AX270 FAQ
Yes, the AirTAC SI50AX270 is discontinued. The direct replacement is the SAI50AX270, which matches the ISO 15552 mounting interface, 50 mm bore, 270 mm stroke, force, and G1/4 port size for a seamless fixture fit.
The G1/4 port feeds a 50 mm bore that generates 982 N push and 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. The piston speed range is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX270
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX270 replacement — usually within 7-8 hours.