This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX950, 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 SI50AX950
The AirTAC Airtac SI50 Standard Cylinder SI50AX950 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 950mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX950, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke950 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX950
- 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 SI50AX950
The AirTAC SI50AX950 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 950mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa. AirTAC replaced this legacy unit with the SAI50AX950, a direct sharing the same ISO 15552 mounting interface, M16x1.5 rod thread, and G1/4 port. The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life.
This specific SKU uses a SUS420J2 stainless steel rod (-A) for corrosion resistance. Without a -S suffix, it lacks a magnet and cannot accept position sensors. Note that a 950mm stroke requires external guides to prevent rod bending under side loads.
Airtac SI50 Standard Cylinder SI50AX950 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX950 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX950 |
| Bore size | Ø50 mm |
| Stroke | 950 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 SAI50AX950 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 SAI50AX950 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 SI50AX950
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×950 | 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 SI50AX950 Is Used
Long-Stroke Diversion
Actuates routing gates on packaging lines where the 950mm travel shifts products between parallel conveyor belts.
Corrosive Washdown
Uses the SUS420J2 stainless rod (-A) to push parts through chemical wash chambers without pitting.
Replacing the Airtac SI50 Standard Cylinder SI50AX950 with the SAI50AX950
To replace the discontinued SI50AX950, order the SAI50AX950. It drops into existing fixtures via the identical ISO 15552 interface, 50mm bore, 950mm stroke, G1/4 port, and SUS420J2 rod. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B sensors; if sensing is needed, specify an SAI50X950S. For load holding, standard air cushions only decelerate the piston and will drift on air loss—use an external pilot check valve or the SAIL/BSAI lock variants. At 950mm, add external guides to prevent rod bending. If you need more force, the 63mm bore yields 1559 N push at 0.5 MPa; if less, the 40mm bore yields 628 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX950
- ✓ 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 SI50AX950 FAQ
Yes, the SI50AX950 is discontinued. The direct replacement is the SAI50AX950. It shares the same ISO 15552 mounting interface, 50mm bore, 950mm stroke, output force, G1/4 port, and SUS420J2 rod, fitting existing fixtures perfectly.
The G1/4 port bore delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. It operates at 30-800 mm/s with a 30mm adjustable air cushion at both ends.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX950
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX950 replacement — usually within 7-8 hours.