This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1150SLB, 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 SI50X1150SLB
The AirTAC SI50 Standard Cylinder SI50X1150SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1150SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1150SLB
- 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 SI50X1150SLB
The AirTAC SI50X1150SLB is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 1150mm stroke, LB foot mount, and magnet for CS1-B/DS1-B switches. It delivers 982N push force at 0.5MPa via a G1/4 port. AirTAC replaced it with the SAI50X1150SLB, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. A plain cylinder drifts on air loss; use an external rod lock for holding.
Airtac SI50 Standard Cylinder SI50X1150SLB Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1150SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1150SLB |
| Bore size | Ø50 mm |
| Stroke | 1150 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 SAI50X1150SLB 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 SAI50X1150SLB 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 SI50X1150SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1150 | 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 SI50X1150SLB Is Used
Long-Stroke Material Push
Transfers products across wide conveyor gaps using the 1150mm reach and 982N push force at 0.5MPa.
Pallet Positioning
Indexes pallets into staging zones via the LB foot mount, relying on the 50kg vertical lift capacity.
Elevated Drop Mechanism
Lowers packaging materials from overhead guides, requiring external support to prevent rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X1150SLB with the SAI50X1150SLB
To replace this SI50X1150SLB, order the SAI50X1150SLB. Verify the ISO 15552 LB foot mount interface, 50mm bore, 1150mm stroke, G1/4 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). At 0.5MPa it pushes 982N; if undersized, the 63mm bore yields 1559N. Note: a plain cylinder does not hold load without live air—the cushion only decelerates. For holding, use an external pilot check valve or the SAIL/BSAI lock variant. Because 1150mm is a long stroke, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1150SLB
- ✓ 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 SI50X1150SLB FAQ
Yes, the SI50X1150SLB is discontinued. The direct replacement is the SAI50X1150SLB. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1150mm stroke, G1/4 port, LB foot mount, and 982N force.
This double-acting 50mm bore cylinder uses a G1/4 port. Force output is 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 SAI50X1150SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1150SLB replacement — usually within 7-8 hours.