This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX105, 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 SI50BX105
The AirTAC Airtac SI50 Standard Cylinder SI50BX105 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX105, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX105
- 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 SI50BX105
The AirTAC SI50BX105 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 105mm stroke. It delivers 982N push and 825N pull at 0.5MPa. The direct replacement is SAI50BX105, retaining the same G1/4 port, M16x1.5 thread, and 30mm cushions. Note the 105mm stroke is nonstandard.
The SAI upgrade features two Y-shaped piston seals for low start-up pressure. This SKU lacks a magnet (-S), so it cannot take CS1-B/DS1-B sensors. The -B rod is SUS304 stainless, and a Viton H seal raises heat to 150C.
Airtac SI50 Standard Cylinder SI50BX105 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX105 |
| Bore size | Ø50 mm |
| Stroke | 105 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 SAI50BX105 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 SAI50BX105 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 SI50BX105
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×105 | 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 SI50BX105 Is Used
Stainless Rod Clamping
The SUS304 -B rod option suits washdown clamping tasks where moisture would corrode standard carbon steel, providing 982N push force at 0.5MPa.
Nonstandard Stroke Diverting
Its specific 105mm nonstandard stroke precisely engages diverting arms on conveyor lines without needing mechanical spacers to adjust travel.
Replacing the Airtac SI50 Standard Cylinder SI50BX105 with the SAI50BX105
To replace the SI50BX105, order the SAI50BX105. It drops into existing ISO 15552 fixtures with identical bore, 105mm stroke, G1/4 port, and mounting. This SKU has no magnet and cannot accept position sensors. The 105mm stroke is nonstandard; verify lead times. For sizing, a 40mm bore yields 628N push at 0.5MPa, while a 63mm bore yields 1559N. The SUS304 -B rod resists corrosion. Air cushions only decelerate; use an external pilot check valve or SAIL lock variant to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX105
- ✓ 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 SI50BX105 FAQ
Yes, the SI50BX105 is discontinued. The direct replacement is the SAI50BX105. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 105mm stroke, G1/4 port, and mounting interface.
The G1/4 port feeds a 50mm bore generating 982N push and 825N pull at 0.5MPa. At 0.7MPa push is 1374N, and the theoretical max is 200kgf at 1.0MPa. The 105mm stroke is nonstandard.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX105 replacement — usually within 7-8 hours.