This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX340S, 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 SI50BX340S
The AirTAC Airtac SI50 Standard Cylinder SI50BX340S 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 SAI50BX340S, 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 → SAI50BX340S
- 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 SI50BX340S
The AirTAC SI50BX340S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 340 mm stroke. It features a SUS304 stainless piston rod (-B) and a built-in magnet (-S) for legacy CS1-B/DS1-B switches. Delivering 982 N push force at 0.5 MPa, its direct replacement is the SAI50BX340S, sharing the same G1/4 port, M16x1.5 thread, and 30 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while keeping the ISO 15552 mounting interface unchanged. The SAI family also adds SAIL, SAIF, and BSAI variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50BX340S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX340S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX340S |
| 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 SAI50BX340S 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 SAI50BX340S 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 SI50BX340S
| 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 SI50BX340S Is Used
Stainless Rod Diverters
Ideal for pushing packages on packaging lines where the SUS304 rod resists moisture and corrosion during washdowns.
Long Stroke Transfers
Handles 340 mm transfer tasks between conveyors, requiring external guides to accommodate the extended stroke length safely.
Replacing the Airtac SI50 Standard Cylinder SI50BX340S with the SAI50BX340S
To replace the SI50BX340S, order the SAI50BX340S. Confirm the ISO 15552 mounting interface, the 50 mm bore, 340 mm stroke, G1/4 port, and your specific mounting accessory. The -B suffix specifies the SUS304 stainless rod, and -S denotes the magnet for current AirTAC switches (replacing legacy CS1-B/DS1-B). Because this is a 340 mm stroke, use external guides to prevent rod bending and side-load wear. For sizing both ways, neighboring bores are 40 mm and 63 mm; at 0.5 MPa this 50 mm bore yields 982 N push and 825 N pull. Note that a plain cylinder drifts without live air—the cushion only decelerates—so for load holding use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX340S
- ✓ 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 SI50BX340S FAQ
Yes, the SI50BX340S is discontinued. The direct replacement is the SAI50BX340S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 340 mm stroke, 982 N force, G1/4 port, and mounting interface.
The bore is 50 mm with a G1/4 air port. The thrust is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX340S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX340S replacement — usually within 7-8 hours.