This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX100, 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 SI50BX100
The AirTAC Airtac SI50 Standard Cylinder SI50BX100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX100
- 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 SI50BX100
The AirTAC SI50BX100 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 100mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50BX100, matching the bore, stroke, force, port and ISO 15552 mounting interface for existing fixtures. This SKU lacks a magnet and cannot accept a sensor.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. This unit uses a SUS304 stainless rod (-B) and Viton H seals raise the -20 to +70C range to 150C.
Airtac SI50 Standard Cylinder SI50BX100 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX100 |
| Bore size | Ø50 mm |
| Stroke | 100 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 SAI50BX100 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 SAI50BX100 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 SI50BX100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×100 | 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 SI50BX100 Is Used
Stainless Rod Clamping
Ideal for clamping machined parts in humid washdown areas using the SUS304 piston rod, providing 982N of reliable push force at 0.5 MPa.
Replacing the Airtac SI50 Standard Cylinder SI50BX100 with the SAI50BX100
To replace the SI50BX100, order the SAI50BX100. Confirm the ISO 15552 mounting interface, 50mm bore, 100mm stroke, G1/4 port (PT/G/NPT) and your specific mounting accessory. This SKU has no magnet (-S), so it cannot take a CS1-B/DS1-B sensor; order a magnet if position detection is needed. Sizing both ways: a 40mm bore gives 628N push at 0.5MPa, while a 63mm bore yields 1559N. For load holding, note a plain cylinder drifts on air loss as cushions only decelerate; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SUS304 rod (-B) suits corrosive environments.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX100
- ✓ 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 SI50BX100 FAQ
Yes, the AirTAC SI50BX100 is discontinued. The direct replacement is the SAI50BX100. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 100mm stroke, G1/4 port and mounting interface.
The G1/4 port feeds a 20mm piston rod delivering 982N push and 825N pull at 0.5 MPa, 1374N push at 0.7 MPa, 1767N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX100 replacement — usually within 7-8 hours.