This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50BX15, 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 SI50BX15
The AirTAC SI50 Standard Cylinder SI50BX15 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50BX15, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50BX15
- 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 SI50BX15
The AirTAC SI50BX15 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 15mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50BX15, which shares identical mounting dimensions, output force, and interface.
This SKU features a SUS304 stainless piston rod (-B) for corrosion resistance but lacks a magnet, meaning it cannot accept position switches. The SAI upgrade introduces a two-piece Y-shaped piston seal for low start-up pressure.
Airtac SI50 Standard Cylinder SI50BX15 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50BX15 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50BX15 |
| Bore size | Ø50 mm |
| Stroke | 15 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 SAI50BX15 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 SAI50BX15 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 SI50BX15
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×15 | 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 SI50BX15 Is Used
Short-Stroke Clamping
Ideal for holding stainless workpieces in machining fixtures where the 15mm stroke and SUS304 rod resist corrosion.
Package Diverting
Provides rapid 50mm bore actuation to push light cartons off a sorting line, utilizing the 982N push force at 0.5MPa.
Compact Ejection
Fits tight machinery footprints to eject formed parts, dropping directly into existing ISO 15552 fixture holes.
Replacing the Airtac SI50 Standard Cylinder SI50BX15 with the SAI50BX15
To replace the SI50BX15, order the SAI50BX15. Verify the ISO 15552 mounting interface, 50mm bore, 15mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. Because this SKU lacks the -S magnet, it cannot support sensors; if sensing is needed, order the SAI with an S suffix. For higher force needs, the neighbouring 63mm bore offers 1559N at 0.5MPa; for lighter loads, the 40mm bore provides 628N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50BX15
- ✓ 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 SI50BX15 FAQ
Yes, the SI50BX15 is discontinued. The direct replacement is the SAI50BX15. It shares the same ISO 15552 mounting interface, 50mm bore, 15mm stroke, 982N force, and G1/4 port, fitting existing fixtures perfectly.
This 50mm bore cylinder uses a G1/4 port. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and 1767N push at 0.9MPa. The theoretical maximum force is 200kgf at 1.0MPa.
Request a Quote for the SAI50BX15
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50BX15 replacement — usually within 7-8 hours.