This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX70, 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 SI50AX70
The AirTAC Airtac SI50 Standard Cylinder SI50AX70 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX70, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX70
- 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 SI50AX70
The AirTAC SI50AX70 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 70mm stroke, delivering 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX70, matching the exact interface, force, and mounting. This SKU lacks a magnet (-S), so it cannot accept position sensors.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. You can specify the SUS420J2 stainless rod (-A) for corrosion resistance or Viton H seals for 0-150C heat.
Airtac SI50 Standard Cylinder SI50AX70 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX70 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX70 |
| Bore size | Ø50 mm |
| Stroke | 70 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 SAI50AX70 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 SAI50AX70 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 SI50AX70
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×70 | 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 SI50AX70 Is Used
Clamp Actuation
Ideal for providing 982N of clamping force on machining fixtures, utilizing the 70mm stroke to secure parts quickly.
Package Diversion
Drives short-stroke pusher arms on packaging lines, moving light cartons without requiring magnetic sensing.
Replacing the Airtac SI50 Standard Cylinder SI50AX70 with the SAI50AX70
To replace the SI50AX70, order the SAI50AX70 and confirm the ISO 15552 mounting interface, 50mm bore, 70mm stroke, G1/4 port, and M16x1.5 rod thread. Choose your mounting accessory (LB, FA, TC, etc.) and note this non-magnetic SKU cannot take a CS1-B/DS1-B switch. Sizing both ways: a 40mm bore yields 628N push @0.5MPa, while a 63mm bore yields 1559N. A plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variants. The 70mm stroke avoids rod-bending side-load issues.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX70
- ✓ 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 SI50AX70 FAQ
Yes, the SI50AX70 is discontinued. The direct replacement is the SAI50AX70. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 70mm stroke, G1/4 port, and mounting footprint.
It features a G1/4 port. Force ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. The rod is 20mm with an M16x1.5 thread.
Request a Quote for the SAI50AX70
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX70 replacement — usually within 7-8 hours.