This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X340H, 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 SI50X340H
The AirTAC Airtac SI50 Standard Cylinder SI50X340H 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 SAI50X340H, 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 → SAI50X340H
- 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 SI50X340H
The AirTAC SI50X340H is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 340 mm stroke. Featuring a high-temperature Viton H seal (0 to 150 C), it delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50X340H, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This specific SKU lacks a magnet (-S) and cannot accept a CS1-B/DS1-B sensor. For load holding on air loss, the cushion only decelerates; you need the SAIL lock variant or an external pilot check valve.
Airtac SI50 Standard Cylinder SI50X340H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X340H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X340H |
| 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 SAI50X340H 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 SAI50X340H 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 SI50X340H
| 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 SI50X340H Is Used
High-Temperature Ejection
Ejects molded parts from hot environments using the Viton H seal rated for 0 to 150 C, providing 982 N push at 0.5 MPa.
Long-Stroke Diversion
Actuates routing gates on packaging lines over a 340 mm travel, requiring external guides to mitigate rod bending.
Replacing the Airtac SI50 Standard Cylinder SI50X340H with the SAI50X340H
To replace the discontinued SI50X340H, order the SAI50X340H. Verify the ISO 15552 mounting interface, the 340 mm stroke, the M16x1.5 rod thread, and the G1/4 port. Because this SKU has no -S magnet, it cannot support position sensing; if switches are needed, order the SAI equivalent with an S suffix for CS1-B/DS1-B compatibility. At 340 mm, add external guides to prevent rod bending and side-load wear. For load holding, the standard cushion only decelerates; use the SAIL or BSAI lock variant, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X340H
- ✓ 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 SI50X340H FAQ
Yes, the SI50X340H is discontinued. The direct replacement is the SAI50X340H. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 340 mm stroke, output force, G1/4 port, and mounting fixtures.
The G1/4 port bore delivers a push of 982 N and a pull of 825 N at 0.5 MPa. At 0.7 MPa the push is 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa. The piston rod is 20 mm with an M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X340H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X340H replacement — usually within 7-8 hours.