This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX50N, 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 SI50AX50N
The AirTAC Airtac SI50 Standard Cylinder SI50AX50N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX50N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX50N
- 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 SI50AX50N
The AirTAC SI50AX50N is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 50mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. This SKU features a SUS420J2 stainless rod and NBR seals, but lacks a magnet so it cannot accept position switches. The direct replacement is the SAI50AX50N, retaining identical mounting and force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL and BSAI lock variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50AX50N Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX50N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX50N |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAI50AX50N 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 SAI50AX50N 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 SI50AX50N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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 SI50AX50N Is Used
Clamping Mechanisms
Applies 982N of clamping thrust at 0.5MPa for securing mid-weight machined components during milling or drilling operations.
Package Diversion
Executes 50mm strokes to actuate routing gates on packaging lines, benefiting from the 30-800mm/s speed range.
Replacing the Airtac SI50 Standard Cylinder SI50AX50N with the SAI50AX50N
To replace the SI50AX50N, order the SAI50AX50N. It is dimensionally interchangeable per the ISO 15552 mounting interface, keeping the exact 50mm bore, 50mm stroke, 982N force, G1/4 port, and M16x1.5 rod thread. Because this specific SKU has no magnet (-S omitted), it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is required. When sizing, neighbouring bores offer 628N (40mm) or 1559N (63mm) push at 0.5MPa. Note that a plain cylinder drifts without live air; for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX50N
- ✓ 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 SI50AX50N FAQ
Yes, the SI50AX50N is discontinued. The direct replacement is the SAI50AX50N. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 50mm stroke, G1/4 port, and mounting fixtures exactly.
The G1/4 port supplies 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable air cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX50N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX50N replacement — usually within 7-8 hours.