This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX75SH, 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 SI50BX75SH
The AirTAC Airtac SI50 Standard Cylinder SI50BX75SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX75SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX75SH
- 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 SI50BX75SH
The AirTAC SI50BX75SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 75mm stroke. It delivers 982N push and 825N pull at 0.5MPa, features a G1/4 air port, and includes a high-temp Viton H seal (0-150C) plus a SUS304 stainless rod. The direct replacement is the SAI50BX75SH, matching the interface, force, and port exactly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI50 Standard Cylinder SI50BX75SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX75SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX75SH |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50BX75SH 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 SAI50BX75SH 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 SI50BX75SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50BX75SH Is Used
Hot End Diverting
Sorts heavy packages on high-temperature conveyor lines using the 982N push force and Viton H seals rated for 0-150C environments.
Stainless Actuation
Drives clamping arms in washdown machinery where the SUS304 rod prevents corrosion and the 75mm stroke provides rapid movement.
Replacing the Airtac SI50 Standard Cylinder SI50BX75SH with the SAI50BX75SH
To replace the SI50BX75SH, order the SAI50BX75SH. Verify the ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port, and your specific mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while the -B rod is SUS304 and -H is the Viton high-temp seal. If sizing alternatives, the neighbouring 40mm bore yields 628N push, while the 63mm bore yields 1559N at 0.5MPa. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX75SH
- ✓ 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 SI50BX75SH FAQ
Yes, the SI50BX75SH is discontinued. The direct replacement is the SAI50BX75SH. It shares the identical ISO 15552 mounting interface, 50mm bore, 75mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N at 0.9MPa, and a theoretical max of 200 kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX75SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX75SH replacement — usually within 7-8 hours.