This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1340S, 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 SI50X1340S
The AirTAC Airtac SI50 Standard Cylinder SI50X1340S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1340mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1340S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1340 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1340S
- 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 SI50X1340S
The AirTAC SI50X1340S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1340mm stroke. Because 1340mm exceeds the 1200mm standard maximum for this bore, it is a non-standard made-to-order unit delivering 982N push force at 0.5MPa. It features a G1/4 port, M16x1.5 rod thread, and a built-in magnet for CS1-B/DS1-B sensors. The direct replacement is the SAI50X1340S, sharing identical ISO 15552 mounting, stroke, force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X1340S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1340S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1340S |
| Bore size | Ø50 mm |
| Stroke | 1340 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 SAI50X1340S 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 SAI50X1340S 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 SI50X1340S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1340 | 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 SI50X1340S Is Used
Extended-Reach Transfer
Pushes products across wide 1340mm conveyor gaps using 982N force, requiring external guides to prevent rod bending.
Multi-Stage Press
Drives long-travel lowering fixtures where 30mm adjustable cushions decelerate the load smoothly at stroke end.
Replacing the Airtac SI50 Standard Cylinder SI50X1340S with the SAI50X1340S
To replace the SI50X1340S, order the SAI50X1340S direct, verifying the ISO 15552 interface, 50mm bore, 1340mm non-standard stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet enables current AirTAC switches (legacy CS1-B/DS1-B). For sizing, the 50mm bore yields 982N push at 0.5MPa; dropping to 40mm gives 628N, while 63mm offers 1559N. At 1340mm, the rod is highly susceptible to bending—use external guides to prevent side-load damage. A plain cylinder does not hold load on air loss; for secure holding, specify the SAIL lock, BSAI clamp-lock, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1340S
- ✓ 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 SI50X1340S FAQ
Yes, the AirTAC SI50X1340S is discontinued. The direct replacement is the SAI50X1340S, which shares the same ISO 15552 mounting interface, 50mm bore, 1340mm stroke, output force, and G1/4 port. It fits existing fixtures perfectly.
The G1/4 port bore delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a 200kgf theoretical max at 1.0MPa. The 1340mm stroke is non-standard (exceeds the 1200mm max), so external guides are required to manage side loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1340S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1340S replacement — usually within 7-8 hours.