This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X120S, 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 SID Series Double-Rod Cylinder SID50X120S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X120S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X120S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X120S
- 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 SID Series Double-Rod Cylinder SID50X120S
The AirTAC SID50X120S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a 50 mm bore, 120 mm stroke, Ø20 mm rod, M16x1.5 rod thread, G1/4 air port, and 30 mm adjustable cushions. This SID model is discontinued; the direct replacement is the SAID50X120S, sharing the same interface, force, and mounting.
The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The double-rod design prevents rotation and lets the back rod carry a sensor cam. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder does not hold loads on air loss; cushions only decelerate. For held loads, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID50X120S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X120S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X120S |
| Bore size | Ø50 mm |
| Stroke | 120 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 SAID50X120S 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 SAID50X120S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID50X120S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×120 | 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 SID Series Double-Rod Cylinder SID50X120S Is Used
Synchronous Tool Driving
Drives two opposing tools simultaneously from a single cylinder body, utilizing the equal push and pull force on both rod ends for matched forming or gripping pressure.
Anti-Rotation Guiding
The twin-rod architecture resists torsional twist under off-center loads, maintaining precise alignment for workpiece positioning without external linear guides.
Dual-End Sensor Cam
The rear extending rod provides a dedicated mechanical cam surface for legacy CS1-B/DS1-B magnetic switches, freeing the primary rod for direct tool mounting.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X120S with the SAID50X120S
To replace the discontinued SID50X120S, install the direct replacement SAID50X120S, which matches the ISO 15552 mounting interface, 50 mm bore, 120 mm stroke, G1/4 port, and equal-both-ways force. When sizing both ways, verify your push and pull requirements against the 825 N @0.5 MPa safe force; if marginally exceeded, step up to the 63 mm bore. A double rod is right when you need anti-rotation stability or must drive two tools from one cylinder. Mounting options include Basic, FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B switches. For strokes >=300 mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X120S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID50X120S FAQ
Yes, the SID50X120S is discontinued. The direct replacement is the SAID50X120S. It shares the same ISO 15552 interface, 50 mm bore, 120 mm stroke, G1/4 port, and equal-both-ways force. The SAI family also adds an upgraded piston seal and SAIL/BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4. Note that air cushions only decelerate near stroke end; they do not hold loads on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X120S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X120S replacement — usually within 7-8 hours.