This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X125S, 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 SID50X125S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X125S 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 SAID50X125S, 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 → SAID50X125S
- 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 SID50X125S
The AirTAC SID50X125S is a discontinued 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. The direct replacement is the SAID50X125S, matching the 50mm bore, 125mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI upgrade uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The twin rods provide anti-rotation stability and allow the back rod to carry a sensor cam, while the -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Bore 50mm features a 20mm rod, M16x1.5 thread, 30mm adjustable cushions, and 30-800 mm/s speed. A plain cylinder does not hold loads on air loss; the cushion only decelerates. For held loads, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID50X125S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X125S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X125S |
| 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 SAID50X125S 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 SAID50X125S 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 SID50X125S
| 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 SID50X125S Is Used
Transfer Pusher
Equal both-ways force drives parts off a conveyor belt on the extend stroke and retracts an opposing stopper block simultaneously without speed or force mismatch.
Gripping Cam
The rear exiting rod carries a sensor cam to trigger external grippers, using the double-rod layout to maintain precise anti-rotation control during clamping.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X125S with the SAID50X125S
To replace the discontinued SID50X125S, install the direct replacement SAID50X125S, reusing the exact ISO 15552 mounting interface (Basic, FA, LB, TC) and G1/4 port. Size both ways by verifying the equal force fits your load; if more force is needed, step up to the 63mm bore (1962 N @0.7 MPa), or drop to 40mm (739 N @0.7 MPa) for lighter duties. A double rod is right when you need anti-rotation stability or must drive two tools simultaneously. The -S magnet enables legacy CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 125mm stroke, side-load is minimal, but for any stroke >=300mm, ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X125S
- ✓ 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 SID50X125S FAQ
Yes, the SID50X125S is discontinued. The direct replacement is the SAID50X125S. It shares the identical ISO 15552 mounting interface, 50mm bore, 125mm stroke, G1/4 port, and equal both-ways force. The SAI family also adds SAIL and BSAI lock variants the SI line lacked.
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 a plain cylinder does not hold loads on air loss; the 30mm adjustable cushions only decelerate near stroke end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X125S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X125S replacement — usually within 7-8 hours.