This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X340, 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 SI50X340
The AirTAC Airtac SI50 Standard Cylinder SI50X340 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 SAI50X340, 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 → SAI50X340
- 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 SI50X340
The AirTAC SI50X340 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 SAI50X340. This direct upgrade shares identical ISO 15552 mounting dimensions, bore, stroke and output force.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. Without a magnet, this SKU cannot take a sensor. SAIL lock and SAIF valve variants expand options.
Airtac SI50 Standard Cylinder SI50X340 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X340 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X340 |
| 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 SAI50X340 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 SAI50X340 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 SI50X340
| 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 SI50X340 Is Used
Package Diverting
Drives diverting arms on packaging lines using the 982 N push force at 0.5 MPa to push cartons reliably onto adjacent belts.
Clamp Actuation
Actuates mid-force clamping fixtures for machining, providing 1374 N of thrust at 0.7 MPa to secure aluminium workpieces.
Replacing the Airtac SI50 Standard Cylinder SI50X340 with the SAI50X340
To replace the SI50X340, order the SAI50X340. Confirm the ISO 15552 interface, 50mm bore, 340mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. This non-magnet SKU cannot accept a sensor. For loads needing holding without live air, use an external rod lock or pilot check valve, or specify the SAIL/BSAI lock variant. At 340mm stroke, use external guides to prevent rod bending and side loads. Neighbouring bores: 40mm yields 628 N [email protected]; 63mm yields 1559 N [email protected].
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X340
- ✓ 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 SI50X340 FAQ
Yes, the AirTAC SI50X340 is discontinued. The direct replacement is the SAI50X340. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 340mm stroke, output force, G1/4 port and mounting interface.
This double-acting cylinder has a G1/4 port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Request a Quote for the SAI50X340
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X340 replacement — usually within 7-8 hours.