This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X156, 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 SI50X156
The AirTAC Airtac SI50 Standard Cylinder SI50X156 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 156mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X156, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke156 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X156
- 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 SI50X156
The AirTAC SI50X156 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 156mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50X156, matching the bore, stroke, force, port and mounting interface exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI50 Standard Cylinder SI50X156 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X156 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X156 |
| Bore size | Ø50 mm |
| Stroke | 156 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 SAI50X156 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 SAI50X156 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 SI50X156
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×156 | 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 SI50X156 Is Used
Package Diversion
Drives a 50 kg lane deflector on a packaging line, using the 156mm stroke to push cartons cleanly without overstroking.
Clamp Actuation
Provides 982 N of push force at 0.5 MPa to secure medium workpieces in a machining fixture prior to milling.
Gate Control
Operates a gravity roller feeder gate, moving 156mm to release single totes into a sorting area safely.
Replacing the Airtac SI50 Standard Cylinder SI50X156 with the SAI50X156
To replace this SI50X156, order the SAI50X156. Confirm the ISO 15552 mounting interface, the 50mm bore, the 156mm stroke (a nonstandard length), the G1/4 port, and your mounting accessory. Because this stroke is nonstandard, double-check dimensions. This plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or choose the SAIL/BSAI lock variant. To size both ways, the neighbouring 63mm bore gives 1559 N push at 0.5 MPa, while dropping pressure yields less force. This non-S SKU cannot accept a magnetic sensor.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X156
- ✓ 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 SI50X156 FAQ
Yes, the SI50X156 is discontinued. The direct replacement is the AirTAC SAI50X156. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 156mm stroke, output force, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 air port. The 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.
Request a Quote for the SAI50X156
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X156 replacement — usually within 7-8 hours.