This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X340S, 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 SI50X340S
The AirTAC SI50 Standard Cylinder SI50X340S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 340mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X340S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke340 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X340S
- 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 SI50X340S
The AirTAC SI50X340S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 340mm stroke. Delivering 982 N push force at 0.5 MPa via a G1/4 port, it is replaced by the SAI50X340S. This direct successor shares identical mounting, stroke, and force specs.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and longevity. The -S magnet supports CS1-B/DS1-B sensors, while SAI adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI50 Standard Cylinder SI50X340S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X340S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X340S |
| Bore size | Ø50 mm |
| Stroke | 340 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 SAI50X340S 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 SAI50X340S 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 SI50X340S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×340 | 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 SI50X340S Is Used
Package Diversion
Drives sorting pop-up arms on packaging lines, utilizing the 982 N push force to redirect cartons at high speeds reliably.
Pallet Handling
Actuates 340mm stroke lifting forks for pallet entry, requiring external guides to manage side-load during horizontal extraction.
Clamp Actuation
Secures medium-weight workpieces in machining fixtures, providing stable 825 N pull force against vibration.
Replacing the Airtac SI50 Standard Cylinder SI50X340S with the SAI50X340S
To replace the SI50X340S, order the SAI50X340S. Verify the ISO 15552 interface, 50mm bore, 340mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. The -S magnet works with legacy CS1-B/DS1-B switches; SAI uses current AirTAC switches. At 0.5 MPa it yields 982 N push / 825 N pull; neighbors are 40mm (628 N) and 63mm (1559 N). For 340mm strokes, use external guides to prevent rod bending. Air cushions only decelerate; for load holding on air loss, use an external rod lock, pilot check valve, or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X340S
- ✓ 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 SI50X340S FAQ
Yes, the SI50X340S is discontinued. The direct replacement is the SAI50X340S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 340mm stroke, output force, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 port. Force ratings are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X340S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X340S replacement — usually within 7-8 hours.