This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX35, 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 SI50BX35
The AirTAC Airtac SI50 Standard Cylinder SI50BX35 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 35mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX35, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke35 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX35
- 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 SI50BX35
The AirTAC SI50BX35 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 35mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50BX35, matching the interface, force, and mounts exactly.
This SKU features a SUS304 stainless steel rod and no magnet, meaning it cannot accept a sensor switch. The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure.
Airtac SI50 Standard Cylinder SI50BX35 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX35 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX35 |
| Bore size | Ø50 mm |
| Stroke | 35 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 SAI50BX35 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 SAI50BX35 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 SI50BX35
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×35 | 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 SI50BX35 Is Used
Stainless Rod Clamping
Ideal for short-stroke clamping tasks where the SUS304 rod prevents corrosion in wet machining environments.
Transfer Line Diverter
Provides reliable 35mm actuation to push packages on a transfer line, utilizing 982 N of thrust at 0.5 MPa.
Parts Ejection Gate
Short 35mm stroke perfectly suited for opening small ejection gates or diverting lightweight components.
Replacing the Airtac SI50 Standard Cylinder SI50BX35 with the SAI50BX35
To replace the SI50BX35, order the SAI50BX35. Verify the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU lacks a magnet (-S), it cannot support position sensing; if sensing is needed, specify an SAI50X35S. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variants. If downsizing to a 40mm bore, expect 628 N push at 0.5 MPa; upsizing to 63mm yields 1559 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX35
- ✓ 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 SI50BX35 FAQ
Yes, the SI50BX35 is discontinued. The direct replacement is the SAI50BX35. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 35mm stroke, G1/4 port, and mounting interface.
It features a G1/4 air port. Theoretical forces are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a maximum of 200 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Request a Quote for the SAI50BX35
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX35 replacement — usually within 7-8 hours.