This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX700SN, 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 SI50AX700SN
The AirTAC Airtac SI50 Standard Cylinder SI50AX700SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX700SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX700SN
- 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 SI50AX700SN
The AirTAC SI50AX700SN is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 700mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50AX700SN, a direct upgrade retaining the exact interface, force, and mounting dimensions.
The SAI successor features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This configuration includes a SUS420J2 stainless steel rod and an NBR seal. The built-in magnet supports CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50AX700SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX700SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX700SN |
| Bore size | Ø50 mm |
| Stroke | 700 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 SAI50AX700SN 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 SAI50AX700SN 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 SI50AX700SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×700 | 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 SI50AX700SN Is Used
Long-Stroke Diversion
Actuates large lane-guides or sorting flaps on packaging conveyors, utilizing the 700mm stroke to fully reroute product flow.
Elevated Storage Retrieval
Pushes totes from high-density shelving in automated retrieval systems, safely handling loads near the 50 kg vertical lift threshold.
Stainless Rod Tooling
Drives external clamps or fixture doors in humid washdown areas where the SUS420J2 stainless rod prevents corrosion.
Replacing the Airtac SI50 Standard Cylinder SI50AX700SN with the SAI50AX700SN
To replace the SI50AX700SN, order the SAI50AX700SN. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and the specific mounting accessory (LB, FA, TC, etc.). The -S magnet enables position sensing, while the -A specifies the SUS420J2 stainless rod and -N denotes the NBR seal. For sizing, a neighbouring 40mm bore yields 628 N push at 0.5 MPa, whereas a 63mm bore provides 1559 N. At 700mm, this stroke requires an external guide to prevent rod bending and side-load damage. Note that a standard cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX700SN
- ✓ 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 SI50AX700SN FAQ
Yes, the SI50AX700SN is discontinued. The direct replacement is the SAI50AX700SN. It matches the ISO 15552 mounting interface, 50mm bore, 700mm stroke, force, and G1/4 port size, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port and provides 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. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and the NBR seal supports -20 to +70 C.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX700SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX700SN replacement — usually within 7-8 hours.