This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX200, 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 SI50BX200
The AirTAC SI50 Standard Cylinder SI50BX200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX200
- 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 SI50BX200
The AirTAC SI50BX200 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 200mm stroke. It features a SUS304 stainless piston rod for corrosion resistance, delivering 982 N push force at 0.5 MPa. The direct replacement is the SAI50BX200, which matches the G1/4 port, M16x1.5 thread, and 30mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This SKU lacks a magnet, so it cannot accept position sensors.
Airtac SI50 Standard Cylinder SI50BX200 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX200 |
| Bore size | Ø50 mm |
| Stroke | 200 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 SAI50BX200 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 SAI50BX200 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 SI50BX200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×200 | 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 SI50BX200 Is Used
Washdown Conveying
Pushes 50 kg carriers through rinsing stations using the SUS304 rod for corrosion resistance.
Light Pressing
Applies up to 982 N at 0.5 MPa for seating bearings in light machining fixtures.
Vertical Lowering
Lowers 50 kg material hoppers smoothly using the 30mm adjustable air cushion.
Replacing the Airtac SI50 Standard Cylinder SI50BX200 with the SAI50BX200
To replace the discontinued SI50BX200, order the SAI50BX200. Verify the ISO 15552 mounting interface, 50mm bore, 200mm stroke, G1/4 port, and SUS304 rod. Since this non-magnetic SKU cannot take sensors, add a -S magnet to the SAI order if CS1-B/DS1-B switches are needed. 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. For load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX200
- ✓ 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 SI50BX200 FAQ
Yes, the SI50BX200 is discontinued. The direct replacement is the SAI50BX200. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 200mm stroke, 982 N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N at 0.9 MPa, and a maximum theoretical force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50BX200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX200 replacement — usually within 7-8 hours.