This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X125, 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 SID50X125
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X125
- 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 SID50X125
The AirTAC SID50X125 is a double-acting, double-rod ISO 15552 cylinder featuring a 50mm bore and 125mm stroke. Because a rod exits both ends, the effective piston area is identical in each direction, yielding equal force both ways: 825N at 0.5MPa, 1154N at 0.7MPa, and 1484N at 0.9MPa. This specific SKU has no -S magnet and cannot accept a magnetic switch. The bore dictates a fixed G1/4 air port, a 20mm rod, and 30mm adjustable cushions at each end. Operating speed spans 30-800mm/s.
This SID50X125 model is discontinued and end-of-life. The direct replacement is the SAID50X125, which preserves the exact ISO 15552 mounting interface, bore, stroke, and G1/4 port. The upgraded SAI family utilizes a two Y-shaped one-way piston seal for lower start-up pressure and longer life, while adding SAIL and BSAI lock variants absent from the legacy SI line. Note that air cushions only decelerate near stroke end; for load holding on air loss, an external rod lock or pilot-operated check valve is required.
Airtac SID Series Double-Rod Cylinder SID50X125 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X125 |
| Bore size | Ø50 mm |
| Stroke | 125 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 SAID50X125 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 SAID50X125 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 SID50X125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 SID50X125 Is Used
Synchronized Dual-Tool Drive
Drives two opposing machining or forming tools simultaneously from a single actuator, utilizing the equal both-ways 1154N force at 0.7MPa to ensure perfectly balanced pressure on both sides of the workpiece.
Symmetrical Transfer Gate
Actuates a diverter gate where the extended and retracted positions must deliver identical clamping pressure, taking advantage of the equal push/pull area while using the 30mm cushions to soften end-of-stroke impacts.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X125 with the SAID50X125
To replace the discontinued SID50X125, swap it directly for the SAID50X125, which reuses the exact ISO 15552 mounting holes and G1/4 port without bracket changes. When sizing, remember force is equal both ways (825N at 0.5MPa), so if you need more thrust, step up to the 63mm bore (1402N at 0.5MPa), or drop to the 40mm bore (528N) for lighter loads. A double-rod design is the right choice when you need anti-rotation stability, want to drive two tools from one cylinder, or need to mount a sensor cam on the back rod. Because this specific SKU lacks the -S magnet, it cannot support magnetic sensing. If your stroke was 300mm or longer, ensure your mounting accommodates side-load deflection, though this 125mm unit is highly rigid. Finally, a plain cylinder drifts on air loss—cushions only decelerate—so specify an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X125
- ✓ 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 SID50X125 FAQ
Yes, the SID50X125 is discontinued and end-of-life. The direct replacement is the SAID50X125. It shares the identical ISO 15552 mounting interface, 50mm bore, 125mm stroke, G1/4 port, and equal both-ways force. The upgraded SAI family also features an improved two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Because it is a double-rod cylinder, force is equal both ways: 825N at 0.5MPa, 1154N at 0.7MPa, and 1484N at 0.9MPa. The fixed air port is G1/4, the piston rod is 20mm with an M16x1.5 thread, and adjustable air cushions are 30mm at each end. Operating speed is 30-800mm/s. This non-magnetic SKU cannot accept switches, and it does not hold loads on air loss.
Related AirTAC SAI Cylinders
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