This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX70S, 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 SI50AX70S
The AirTAC Airtac SI50 Standard Cylinder SI50AX70S 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 SAI50AX70S, 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 → SAI50AX70S
- 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 SI50AX70S
The AirTAC SI50AX70S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, 70 mm stroke, and a G1/4 port. It delivers 982 N of push force and 825 N of pull force at 0.5 MPa. The direct replacement is the SAI50AX70S, matching the original bore, stroke, output force, port size, and ISO 15552 mounting interface for a seamless fixture swap.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. This SI50AX70S variant features a SUS420J2 stainless steel rod (-A) and a piston magnet (-S) for legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50AX70S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX70S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX70S |
| 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 SAI50AX70S 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 SAI50AX70S 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 SI50AX70S
| 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 SI50AX70S Is Used
Mid-Force Clamping
Ideal for securing medium-sized metal or composite parts during machining, utilizing the 982 N push force at 0.5 MPa.
Package Diversion
Provides reliable 70 mm stroke actuation for routing moderate-weight goods on assembly and packaging lines.
Replacing the Airtac SI50 Standard Cylinder SI50AX70S with the SAI50AX70S
To replace the SI50AX70S, order the SAI50AX70S and confirm the ISO 15552 mounting interface, 50 mm bore, 70 mm stroke, G1/4 port, and your specific mounting accessory. The -S magnet enables position sensing, and the -A rod specifies the SUS420J2 stainless steel material. If you need more force, the neighbouring 63 mm bore provides 1559 N push at 0.5 MPa; if less is required, the 40 mm bore offers 628 N. Remember that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX70S
- ✓ 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 SI50AX70S FAQ
Yes, the AirTAC SI50AX70S is discontinued. The direct replacement is the SAI50AX70S. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 70 mm stroke, force, G1/4 port, and mounting interface.
The 50 mm bore cylinder 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, features a 20 mm rod, M16x1.5 thread, and 30 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX70S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX70S replacement — usually within 7-8 hours.