This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX40SH, 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 SI50BX40SH
The AirTAC Airtac SI50 Standard Cylinder SI50BX40SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX40SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX40SH
- 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 SI50BX40SH
The AirTAC SI50BX40SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 40mm stroke, and a SUS304 stainless steel rod. It delivers 982 N push force at 0.5 MPa and uses a G1/4 air port. AirTAC replaced this legacy unit with the SAI50BX40SH, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This unit includes the -H Viton seal for 0-150 C high-temperature environments and a -S magnet for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50BX40SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX40SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX40SH |
| Bore size | Ø50 mm |
| Stroke | 40 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 SAI50BX40SH 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 SAI50BX40SH 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 SI50BX40SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SI50BX40SH Is Used
Stainless Rod Clamping
Ideal for securing workpieces in machining cells, utilizing the SUS304 rod for corrosion resistance in wet coolant environments.
High-Temp Diverting
Suitable for actuating diverter gates near ovens or heat sources, leveraging the Viton H seal to withstand 0-150 C ambient heat.
Compact Ejection
Provides reliable 982 N push force for short-stroke part ejection on assembly lines, fitting neatly into tight ISO 15552 fixtures.
Replacing the Airtac SI50 Standard Cylinder SI50BX40SH with the SAI50BX40SH
To replace the discontinued SI50BX40SH, order the SAI50BX40SH, verifying the ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread. Retain your original mounting accessories and confirm the -S magnet for current AirTAC switches. If downsizing, a 40mm bore yields 628 N push at 0.5 MPa; if upsizing, a 63mm bore provides 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX40SH
- ✓ 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 SI50BX40SH FAQ
Yes, the SI50BX40SH is discontinued. The direct replacement is the SAI50BX40SH. It shares the same ISO 15552 mounting interface, 50mm bore, 40mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly while adding an upgraded piston seal.
This double-acting cylinder uses a G1/4 air port. It delivers 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 SAI50BX40SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX40SH replacement — usually within 7-8 hours.