This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X150, 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 SI50X150
The AirTAC Airtac SI50 Standard Cylinder SI50X150 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 SAI50X150, 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 → SAI50X150
- 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 SI50X150
The AirTAC SI50X150 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 SAI50X150, retaining identical ISO 15552 mounting dimensions, bore, stroke, output force, and porting to fit existing fixtures seamlessly.
This SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SI50X150 SKU lacks a magnet and cannot accept position sensors, whereas the legacy SI series used CS1-B/DS1-B switches on magnetized variants.
Airtac SI50 Standard Cylinder SI50X150 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X150 |
| 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 SAI50X150 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 SAI50X150 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 SI50X150
| 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 SI50X150 Is Used
Package Diverting
Ideal for actuating routing gates on packaging lines where 982N push force reliably redirects medium-weight cartons.
Replacing the Airtac SI50 Standard Cylinder SI50X150 with the SAI50X150
To replace the discontinued SI50X150, order the SAI50X150. Confirm the ISO 15552 interface, 50mm bore, 150mm stroke, G1/4 port (PT/G/NPT thread options), and your mounting accessory (LB, FA, CA, TC, etc.). Because this SKU has no magnet (-S), it cannot support sensors; if position detection is needed, specify a magnetized SAI50X150S and use current AirTAC switches. When sizing both ways, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore provides 1559N. If your application requires load holding on air loss, note that a plain cylinder drifts and the air cushion only decelerates; use an external rod lock, pilot check valve, or explore the SAIL or BSAI lock variants. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X150
- ✓ 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 SI50X150 FAQ
Yes, the AirTAC SI50X150 is discontinued. The direct replacement is the SAI50X150. It features the same ISO 15552 mounting interface, 50mm bore, 150mm stroke, output force, and G1/4 port, fitting directly into existing fixtures without modifications.
The 50mm bore uses a G1/4 air port and an M16x1.5 rod thread. At 0.5MPa it provides 982N push and 825N pull force. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Request a Quote for the SAI50X150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X150 replacement — usually within 7-8 hours.