This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX1350S, 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 SI50BX1350S
The AirTAC SI50 Standard Cylinder SI50BX1350S 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 SAI50BX1350S, 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 → SAI50BX1350S
- 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 SI50BX1350S
The AirTAC SI50BX1350S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1350mm stroke. It delivers 982 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50BX1350S, matching the interface, stroke, force, and mounting. This 1350mm length exceeds the 1200mm standard maximum, making it a non-standard or made-to-order item.
The SAI upgrade features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -B suffix indicates a SUS304 stainless piston rod for corrosion resistance, and the -S magnet works with legacy CS1-B/DS1-B sensors. Note that plain cylinders drift on air loss; use an external rod lock or pilot check valve for load holding.
Airtac SI50 Standard Cylinder SI50BX1350S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX1350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX1350S |
| 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 SAI50BX1350S 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 SAI50BX1350S 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 SI50BX1350S
| 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 SI50BX1350S Is Used
Long-Stroke Diversion
Ideal for pushing heavy pallets across wide conveyor lanes where the 1350mm reach and 982 N output at 0.5 MPa are required.
High-Reach Material Handling
Used in automated storage systems to actuate elevated platforms or doors, benefiting from the SUS304 stainless rod for corrosion resistance.
Large Press Ejection
Ejects wide fabricated parts from press beds, utilizing the 30mm adjustable air cushions at both ends to decelerate the payload smoothly.
Replacing the Airtac SI50 Standard Cylinder SI50BX1350S with the SAI50BX1350S
To replace the SI50BX1350S, order the SAI50BX1350S. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and -S magnet for CS1-B/DS1-B switches. Because this 1350mm stroke exceeds the 1200mm standard maximum, expect a made-to-order lead time and ensure external guides are used to prevent rod bending over this long distance. Sizing both ways: if you need more force, the 63mm bore offers 1559 N at 0.5 MPa; if you need less, the 40mm bore provides 628 N. A plain cylinder does not hold load without live air—the cushion only decelerates. For secure holding, consider the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX1350S
- ✓ 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 SI50BX1350S FAQ
Yes, the AirTAC SI50BX1350S is discontinued. The direct replacement is the SAI50BX1350S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 1350mm stroke, G1/4 port, and mounting interface. The SAI simply upgrades the piston seal to two Y-shaped elements for lower start-up pressure.
The air port is G1/4. The force ratings are: 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 pressure is 0.15-1.0 MPa, with a speed range of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX1350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX1350S replacement — usually within 7-8 hours.