This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X270, 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 SI50X270
The AirTAC Airtac SI50 Standard Cylinder SI50X270 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 SAI50X270, 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 → SAI50X270
- 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 SI50X270
The AirTAC SI50X270 is a discontinued double-acting ISO 15552 profile cylinder delivering a push force of 982 N at 0.5 MPa. AirTAC replaced this legacy unit with the SAI50X270, a direct upgrade retaining the exact 50 mm bore, 270 mm stroke, G1/4 port, and ISO 15552 mounting interface. This standard SKU lacks a magnet, so it cannot accept a position sensor.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and extended life, while preserving the original thrust ratings. For applications needing heat resistance, Viton H seals raise the operating ceiling to 150 C.
Airtac SI50 Standard Cylinder SI50X270 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X270 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X270 |
| 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 SAI50X270 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 SAI50X270 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 SI50X270
| 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 SI50X270 Is Used
Package Diverting
Drives diverting arms on packaging lines using the 982 N push force to redirect cartons at high cycling speeds.
Light Pressing
Applies consistent downward pressure for seating bearings or pins, utilizing the 50 kg vertical lift capacity safely.
Pallet Stops
Acts as a pneumatic stop mechanism in conveyor accumulation zones, holding loads securely with external check valves.
Replacing the Airtac SI50 Standard Cylinder SI50X270 with the SAI50X270
To replace the SI50X270, order the SAI50X270 and verify your ISO 15552 mounting fixture, G1/4 port thread (PT/G/NPT), and M16x1.5 rod-end connection. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; add the S suffix if position feedback is required. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa, while the neighboring 40 mm bore provides 628 N and the 63 mm bore offers 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates the stroke end—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding. At 270 mm stroke, ensure adequate guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X270
- ✓ 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 SI50X270 FAQ
Yes, the SI50X270 is discontinued. The direct replacement is the SAI50X270. It features the same ISO 15552 mounting interface, 50 mm bore, 270 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The bore is 50 mm with a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X270
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X270 replacement — usually within 7-8 hours.