This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX800, 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 SI50AX800
The AirTAC Airtac SI50 Standard Cylinder SI50AX800 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX800, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX800
- 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 SI50AX800
The AirTAC SI50AX800 is a discontinued double-acting ISO 15552 profile cylinder with an 800 mm stroke and a SUS420J2 stainless piston rod. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI50AX800, matching the bore, stroke, force, port and ISO 15552 mounting interface exactly.
The SAI upgrade uses two Y-shaped one-way piston seals for low start-up pressure and long life. Without a -S suffix, this SKU lacks a magnet and cannot accept a CS1-B/DS1-B sensor. For load holding, note that cushions only decelerate; use an external rod lock or SAIL/BSAI variant.
Airtac SI50 Standard Cylinder SI50AX800 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX800 |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAI50AX800 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 SAI50AX800 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 SI50AX800
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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 SI50AX800 Is Used
Long-Stroke Diversion
Drives sorting gates on packaging lines over an 800 mm travel distance, utilizing the 982 N push force to reliably pivot heavy product flow.
Replacing the Airtac SI50 Standard Cylinder SI50AX800 with the SAI50AX800
To replace the SI50AX800, order the SAI50AX800. Verify the ISO 15552 mounting interface, the G1/4 port, the M16x1.5 rod thread, and the -A SUS420J2 stainless rod option. Because this SKU has no -S magnet, it cannot support position sensing; add the magnet if switches are needed. At 0.5 MPa, the 50 mm bore yields 982 N push (982 N at 0.7 MPa is 1374 N). If undersizing, a 40 mm bore gives 628 N push; if oversizing, a 63 mm bore provides 1559 N. For the 800 mm stroke, use external guides to prevent rod bending and side loads. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX800
- ✓ 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 SI50AX800 FAQ
Yes, the AirTAC SI50AX800 is discontinued. The direct replacement is the SAI50AX800. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 800 mm stroke, 982 N force, G1/4 port, and mounting interface. The SAI features an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
This double-acting cylinder has a 50 mm bore, 800 mm stroke, M16x1.5 rod thread, and a G1/4 port. It operates at 30-800 mm/s. Force ratings are 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a maximum theoretical force of 200 kgf at 1.0 MPa. This specific -A variant uses a SUS420J2 stainless rod and lacks a magnet for sensors.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX800 replacement — usually within 7-8 hours.