This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1350S, 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 SI50X1350S
The AirTAC SI50 Standard Cylinder SI50X1350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1350S
- 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 SI50X1350S
The AirTAC SI50X1350S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1350mm stroke. Because 1350mm exceeds the 1200mm standard maximum for this bore, it is a non-standard made-to-order unit. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X1350S, sharing the same interface, force and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For applications needing load holding on air loss, the SAI family adds SAIL and BSAI lock variants the SI lacked. The -S magnet supports legacy CS1-B/DS1-B sensors, while SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1350S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1350S |
| Bore size | Ø50 mm |
| Stroke | 1350 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 SAI50X1350S 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 SAI50X1350S 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 SI50X1350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1350 | 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 SI50X1350S Is Used
Long-Reach Diversion
Actuates diverter gates on wide conveyor lines where the 1350mm stroke is required to clear product lanes.
High-Bay Pusher
Pushes pallets or totes from storage racks, utilizing the 50kg vertical lift capacity safely.
Material Transfer Arm
Drives extended transfer arms between machine cells, guided externally to manage the long rod length.
Replacing the Airtac SI50 Standard Cylinder SI50X1350S with the SAI50X1350S
To replace the SI50X1350S, order the SAI50X1350S direct equivalent, confirming the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread and 30mm cushions. Retain your mounting accessory (LB, FA, TC, etc.) and the -S magnet requirement. If you do not need the full 1350mm non-standard stroke, sizing down to the 1200mm standard stroke lowers cost and lead time. To increase force, the neighbouring 63mm bore provides 1559N push at 0.5MPa. For the 63mm bore, the port increases to G3/8. Because 1350mm is a long stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1350S
- ✓ 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 SI50X1350S FAQ
Yes, the SI50X1350S is discontinued. The direct replacement is the SAI50X1350S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 1350mm stroke, G1/4 port and mounting interface.
The G1/4 port is fixed by the 50mm bore. Force ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1350S replacement — usually within 7-8 hours.