This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX140, 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 SI50BX140
The AirTAC Airtac SI50 Standard Cylinder SI50BX140 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 140mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX140, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX140
- 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 SI50BX140
The AirTAC SI50BX140 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 140mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50BX140, sharing the exact same interface, force, and mounting fixtures.
This SKU features a SUS304 stainless steel rod for corrosion resistance, but lacks a magnet so it cannot accept a sensor. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure.
Airtac SI50 Standard Cylinder SI50BX140 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX140 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX140 |
| Bore size | Ø50 mm |
| Stroke | 140 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 SAI50BX140 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 SAI50BX140 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 SI50BX140
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×140 | 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 SI50BX140 Is Used
Stainless Rod Actuation
Ideal for moderate-force machinery tasks requiring the corrosion resistance of the SUS304 piston rod in humid or washdown environments.
Material Diversion
Provides reliable 140mm stroke actuation for diverting packages or components on a production line using 982 N of push force at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50BX140 with the SAI50BX140
To replace the SI50BX140, order the SAI50BX140 and confirm the ISO 15552 mounting interface, 50mm bore, 140mm stroke, G1/4 port, and SUS304 rod. Because this non-magnet SKU cannot take a switch, add a CS1-B/DS1-B sensor only if migrating to an -S SAI. Sizing both ways: a 40mm bore yields 628 N push @0.5 MPa, while a 63mm bore yields 1559 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify an SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX140
- ✓ 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 SI50BX140 FAQ
Yes, the AirTAC SI50BX140 is discontinued. The direct replacement is the SAI50BX140. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 140mm stroke, G1/4 port, and mounting accessories.
This double-acting cylinder uses a G1/4 air port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX140
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX140 replacement — usually within 7-8 hours.