This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX100, 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 SI50AX100
The AirTAC Airtac SI50 Standard Cylinder SI50AX100 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 SAI50AX100, 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 → SAI50AX100
- 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 SI50AX100
The AirTAC SI50AX100 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 100 mm stroke. It delivers 982 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX100, which shares the exact same ISO 15552 mounting interface, stroke, force and porting for a seamless fixture swap. This specific SKU features a SUS420J2 stainless steel piston rod (the -A option) for corrosion resistance, but lacks a magnet, so it cannot accept position sensors.
The SAI50AX100 upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements, ensuring low start-up pressure and extended service life. If your application requires load holding on air loss, note that the standard cushion only decelerates the piston; you will need an external pilot check valve or the SAIL lock variant.
Airtac SI50 Standard Cylinder SI50AX100 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX100 |
| 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 SAI50AX100 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 SAI50AX100 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 SI50AX100
| 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 SI50AX100 Is Used
Package Diverting
Actuates routing gates on packaging lines where the 982 N push force easily redirects standard cartons.
Corrosive Milling Clamp
The SUS420J2 stainless rod provides the corrosion resistance needed for clamping parts in wet machining environments.
Replacing the Airtac SI50 Standard Cylinder SI50AX100 with the SAI50AX100
To replace the discontinued SI50AX100, order the SAI50AX100. Verify your existing ISO 15552 mounting accessories (LB, FA, TC, etc.), the 100 mm stroke, and the G1/4 port threads. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, select an SAI model with the S suffix. The -A rod indicates a SUS420J2 stainless rod, so specify this material code on the new SAI order if corrosion resistance is needed. Sizing both ways: the 50 mm bore yields 982 N push at 0.5 MPa (1374 N at 0.7 MPa); if this is insufficient, step up to the 63 mm bore (1559 N at 0.5 MPa), or drop to 40 mm (628 N) for lighter loads. For load-holding applications, remember the air cushion only decelerates and does not brake; consider the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX100
- ✓ 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 SI50AX100 FAQ
Yes, the SI50AX100 is discontinued. The direct replacement is the SAI50AX100. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 100 mm stroke, 982 N force, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 port and generates 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX100 replacement — usually within 7-8 hours.