This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X145, 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 SI50X145
The AirTAC Airtac SI50 Standard Cylinder SI50X145 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X145, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X145
- 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 SI50X145
The AirTAC SI50X145 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 145 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. Because this legacy unit is end-of-life, AirTAC supplies the SAI50X145 as the direct successor, retaining the same interface, force and mounting dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For applications needing load holding on air loss, the newer family adds SAIL and BSAI lock variants the SI lacked. Note this specific SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor.
Airtac SI50 Standard Cylinder SI50X145 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X145 |
| Bore size | Ø50 mm |
| Stroke | 145 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 SAI50X145 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 SAI50X145 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 SI50X145
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×145 | 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 SI50X145 Is Used
Package Diversion
Actuates routing gates on packaging lines using the 982 N push force to reliably deflect medium weight cartons at speed.
Light Pressing
Applies consistent downward pressure for assembling small components, utilizing the 825 N pull capacity for return strokes.
Pallet Stops
Functions as a pneumatic stop in conveyor end-of-line zones, holding loads securely during active air supply.
Replacing the Airtac SI50 Standard Cylinder SI50X145 with the SAI50X145
To replace the SI50X145, order the SAI50X145. Verify the ISO 15552 mounting interface, 145 mm stroke, 50 mm bore and G1/4 port (PT/G/NPT thread options). Retain your original mounting accessory and note this non-magnet SKU cannot host a sensor. For sizing, the 50 mm bore yields 982 N push at 0.5 MPa; if less force is needed the 40 mm bore offers 628 N, while the 63 mm bore provides 1559 N. A plain cylinder drifts on air loss, so for load holding select the SAIL lock variant or an external pilot check valve. The 145 mm stroke is under 300 mm, so rod-bending side loads are minimal, but always guide the load to prevent lateral stress.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X145
- ✓ 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 SI50X145 FAQ
Yes, the SI50X145 is discontinued. The direct replacement is the SAI50X145. It features the same ISO 15552 mounting interface, 50 mm bore, 145 mm stroke, output force and G1/4 port, fitting directly into existing fixtures.
The 50 mm bore uses a G1/4 air port. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI50X145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X145 replacement — usually within 7-8 hours.