This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X300S, 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 SID125X300S
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X300S 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 SAID125X300S, 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 → SAID125X300S
- 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 SID125X300S
The AirTAC SID125X300S is a discontinued double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. It features a 125mm bore, M27x2 rod thread, G1/2 port, and 40mm adjustable cushions. The direct replacement is the SAID125X300S, sharing the same mounting interface, bore, stroke, and force.
The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B sensors. Note that air cushions only decelerate; they do not hold loads on air loss, so use an external rod lock or SAIL/BSAI variant for holding.
Airtac SID Series Double-Rod Cylinder SID125X300S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X300S |
| 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 SAID125X300S 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 SAID125X300S 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 SID125X300S
| 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 SID125X300S Is Used
Twin-Tool Drive Station
Drives two opposing machining heads simultaneously, utilising the equal both-ways force to ensure perfectly balanced clamping on both sides of a heavy workpiece.
Anti-Rotation Diverter
Uses the twin-rod architecture to prevent mechanical rotation during high-speed lane diverting on a conveyor, eliminating the need for external guide rails.
Symmetric Pressing Unit
Applies 5734 N of force on both the extend and retract strokes to form sheet metal, using the rear rod to carry a sensor cam for precise position feedback.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X300S with the SAID125X300S
Replace the discontinued SID125X300S directly with the SAID125X300S, matching the 125mm bore, 300mm stroke, G1/2 port, and ISO 15552 dimensions. Size both ways by checking neighbouring bores (100mm or 160mm) against your equal-both-ways force requirement. A double rod is right when you need anti-rotation, a back rod to carry a sensor cam, or to drive two tools. Mounting uses Basic, FA, LB, or TC styles. For the 300mm stroke, add external guides to prevent rod bending under side-load. The -S magnet enables switches; choose SAIL or BSAI if load-holding is required.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X300S
- ✓ 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 SID125X300S FAQ
Yes, the SID125X300S is discontinued. The direct replacement is the SAID125X300S. It shares the same ISO 15552 interface, 125mm bore, 300mm stroke, G1/2 port, and equal both-ways force, while adding an upgraded two Y-shaped one-way piston seal.
Because it is a double-rod cylinder, force is equal both ways: 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. The air port is G1/2, the rod thread is M27x2, and speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X300S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X300S replacement — usually within 7-8 hours.