This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1350, 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 SI50X1350
The AirTAC SI50 Standard Cylinder SI50X1350 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 SAI50X1350, 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 → SAI50X1350
- 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 SI50X1350
The AirTAC SI50X1350 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1350mm stroke. It delivers 982N push and 825N pull at 0.5MPa via a G1/4 port. Because 1350mm exceeds the 1200mm standard stroke max, this is a non-standard made-to-order unit requiring external guides to prevent rod bending. The direct replacement is the SAI50X1350, matching the exact ISO 15552 mounting interface, force, and accessories.
Upgrading to the SAI50X1350 retains all ratings but introduces an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this SKU lacks a magnet (-S) so it cannot accept CS1-B/DS1-B sensors. For load holding, the cushion only decelerates; explore the SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X1350 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1350 |
| 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 SAI50X1350 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 SAI50X1350 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 SI50X1350
| 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 SI50X1350 Is Used
Extended Transfer Push
Moves products between distant conveyor sections using the 1350mm stroke, relying on external guides to prevent rod deflection.
High-Reach Material Handover
Acts as a long-reach actuator for handing off 50kg palletized components between automated storage tiers.
Replacing the Airtac SI50 Standard Cylinder SI50X1350 with the SAI50X1350
To replace the SI50X1350, order the SAI50X1350 and confirm the ISO 15552 interface, 50mm bore, 1350mm stroke, G1/4 port (PT/G/NPT), and mounting accessory (LB, FA, TC, etc.). This SKU has no magnet, so it cannot support position sensing; order an SAI50X1350S if a switch is needed. Sizing both ways: a 63mm bore yields 1559N push at 0.5MPa, while a 40mm bore yields 628N. Since 1350mm exceeds the 1200mm standard max, it is made-to-order and demands external guides to manage side-load and rod-bending. A plain cylinder drifts without air; use a pilot check valve or the SAIL/BSAI lock variants for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1350
- ✓ 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 SI50X1350 FAQ
Yes, the SI50X1350 is discontinued. The direct replacement is the SAI50X1350. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 1350mm stroke, 982N force, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 port and M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1350
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1350 replacement — usually within 7-8 hours.