This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX115, 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 SI50BX115
The AirTAC Airtac SI50 Standard Cylinder SI50BX115 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX115, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX115
- 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 SI50BX115
The AirTAC SI50BX115 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 115mm stroke. It delivers 982N push and 825N pull at 0.5MPa, features a Ø20mm rod, M16x1.5 thread, and a G1/4 port. The direct replacement is the SAI50BX115, matching the exact interface, force, and mounting.
This SKU uses a SUS304 stainless rod (-B) but lacks a magnet, so it cannot take a sensor. The SAI upgrade adds two Y-shaped piston seals for low start-up pressure. For high heat, Viton H seals raise the limit to 150C.
Airtac SI50 Standard Cylinder SI50BX115 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX115 |
| Bore size | Ø50 mm |
| Stroke | 115 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 SAI50BX115 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 SAI50BX115 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 SI50BX115
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×115 | 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 SI50BX115 Is Used
Stainless Rod Diverter
The SUS304 rod option handles washdown environments, using the 982N push force to divert packages on a conveyor line.
Mid-Force Clamp
Ideal for holding medium workpieces during machining, relying on the 825N pull force at 0.5MPa to secure the part.
Replacing the Airtac SI50 Standard Cylinder SI50BX115 with the SAI50BX115
To replace the SI50BX115, order the SAI50BX115. Verify your ISO 15552 mounting (LB, FA, TC, etc.), the G1/4 port, and the 115mm stroke. Because this SKU has no magnet (-S), it cannot accept CS1-B/DS1-B switches; order a sensing version if needed. The 50mm bore yields 982N push at 0.5MPa; step down to 40mm for 628N or up to 63mm for 1559N. For load holding on air loss, add an external pilot check valve or use the SAIL/BSAI lock variants, as cushions only decelerate. The SUS304 rod suits corrosive settings.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX115
- ✓ 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 SI50BX115 FAQ
Yes, the SI50BX115 is discontinued. The direct replacement is the SAI50BX115. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 115mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 port. It generates 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX115 replacement — usually within 7-8 hours.