This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X75SN, 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 SI50X75SN
The AirTAC Airtac SI50 Standard Cylinder SI50X75SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X75SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X75SN
- 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 SI50X75SN
The AirTAC SI50X75SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore and 75mm stroke. It delivers 982N push force at 0.5MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI50X75SN, a direct replacement retaining the exact interface, bore, stroke, and mounting hardware.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for lower start-up pressure and extended life. This unit includes a piston magnet for legacy CS1-B/DS1-B sensors and an NBR seal rated for -20 to +70C (a Viton H option extends this to 150C).
Airtac SI50 Standard Cylinder SI50X75SN Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X75SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X75SN |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAI50X75SN 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 SAI50X75SN 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 SI50X75SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SI50X75SN Is Used
Package Diverting
Actuates routing gates on packaging lines where the 982N push force easily deflects standard cartons.
Clamp Actuation
Provides reliable holding pressure for mid-sized machining fixtures, utilizing the 825N pull force.
Replacing the Airtac SI50 Standard Cylinder SI50X75SN with the SAI50X75SN
To replace the SI50X75SN, order the SAI50X75SN. Confirm your ISO 15552 mounting fixtures (LB, FA, TC, etc.), the G1/4 air port, and the M16x1.5 rod thread. The magnet (-S) and NBR seal (-N) carry over directly. If you need more force, the neighbouring 63mm bore provides 1559N at 0.5MPa; if less is required, the 40mm bore offers 628N. Remember that a standard cylinder drifts without live air, as the cushion only decelerates at stroke end. For load holding, consider an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X75SN
- ✓ 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 SI50X75SN FAQ
Yes, the SI50X75SN is discontinued. The direct replacement is the SAI50X75SN. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 75mm stroke, G1/4 port, and mounting interface.
The G1/4 port feeds a 50mm bore that outputs 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X75SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X75SN replacement — usually within 7-8 hours.