This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X300, 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 SID125X300
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X300 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 300mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X300, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X300
- 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 SID125X300
The AirTAC SID125X300 is a discontinued double-acting double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. It features a 125mm bore, 32mm rod, M27x2 thread, G1/2 port, and 40mm adjustable cushions. The direct replacement is the SAID125X300, matching the interface, bore, stroke, and force.
Because both faces use the rod-side area, this design provides anti-rotation stability and lets the back rod carry a sensor cam or drive two tools simultaneously. The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This non-magnetic SKU cannot take a switch.
Airtac SID Series Double-Rod Cylinder SID125X300 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X300 |
| Bore size | Ø125 mm |
| Stroke | 300 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID125X300 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAID125X300 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 SID125X300
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SID125X300 Is Used
Dual-Tool Machining Station
Drives two opposing machining heads simultaneously from one piston, utilizing the equal both ways force to maintain perfectly synchronized cutting cycles.
Anti-Rotation Transfer Pusher
Employs the twin rods exiting both ends to prevent mechanical twisting during high-speed part ejection, ensuring straight pushes onto a moving belt.
External Cam Positioning
Leverages the rear extending rod to physically trip an external mechanical limit valve, providing a hard mechanical position signal without internal sensors.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X300 with the SAID125X300
To replace the discontinued SID125X300, install the direct replacement SAID125X300, which reuses the exact ISO 15552 mounting interface, G1/2 port, and 300mm stroke. Size both ways by checking neighbor bores if you need more or less equal-both-ways force, but the 125mm bore yields 5734 N at 0.5 MPa. A double rod is right when you need anti-rotation resistance or want to drive two tools from one piston. Reuse FA, LB, or TC mounts. As this SKU lacks the -S magnet, it cannot accept sensors. For the 300mm stroke, add external guides to prevent rod bending under side loads. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X300
- ✓ 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 SID125X300 FAQ
Yes, the SID125X300 is discontinued. The direct replacement is the SAID125X300, which matches the ISO 15552 mounting interface, 125mm bore, 300mm stroke, G1/2 port, and equal force. The SAI family also adds upgraded Y-shaped piston seals.
Force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. Operating pressure is 0.15-1.0 MPa. Speed is 30-500 mm/s. The bore uses a G1/2 port, a 32mm rod, and 40mm adjustable cushions. It will not hold a load on air loss without an external rod lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X300
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X300 replacement — usually within 7-8 hours.