This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X900, 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 SID125X900
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X900 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X900, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X900
- 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 SID125X900
The AirTAC SID125X900 is a discontinued double-acting double-rod ISO 15552 cylinder with a 125mm bore and 900mm stroke. A rod exits both ends on one piston, so push and pull force are equal at 5734N @0.5MPa, 8028N @0.7MPa, and 10321N @0.9MPa. The direct replacement is the SAID125X900, matching the G1/2 port, M27x2 rod thread, and 40mm cushions. The SAI family uses an upgraded two Y-shaped one-way piston seal for low start-up pressure and long life.
Because both faces use the rod-side area, the back rod can drive a second tool or carry a sensor cam without force loss, while preventing rotation. This non-magnet SKU cannot take a switch. A plain cylinder drifts on air loss; cushions only decelerate near stroke end, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID125X900 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X900 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X900 |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAID125X900 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 SAID125X900 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 SID125X900
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×900 | 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 SID125X900 Is Used
Twin-Tool Machining Station
Drives two opposing machining heads simultaneously using both extending rods, ensuring perfectly synchronized cutting cycles with equal 5734N force at 0.5MPa.
Anti-Rotation Transfer Gate
Indexes a heavy transfer gate across a conveyor line. The dual-rod architecture prevents mechanical twist and binding during the 900mm traverse.
Symmetric Pallet Stopper
Actuates a pallet-stopping jaw where the rear rod simultaneously displaces a mechanical cam, operating a physical latch without requiring onboard sensors.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X900 with the SAID125X900
Replace the discontinued SID125X900 directly with the SAID125X900, reusing the ISO 15552 mounting interface and FA, LB, or TC brackets. Size both ways by checking neighbor bores: the 100mm bore yields 3681N @0.5MPa, while the 160mm bore yields 9425N @0.5MPa, both equal in push and pull. Choose a double-rod cylinder when you need anti-rotation, equal force both ways, or a back rod for a sensor cam. This SKU lacks the -S magnet and cannot take a switch. For the 900mm stroke, add external guides to prevent rod bending under side loads. Avoid load-holding without live air; use an external rod lock or pilot-operated check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X900
- ✓ 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 SID125X900 FAQ
Yes, the SID125X900 is discontinued. The direct replacement is the SAID125X900, offering the same ISO 15552 interface, 125mm bore, 900mm stroke, G1/2 port, and equal both-ways force. The SAI upgrade features a two Y-shaped one-way piston seal for longer life.
Force is equal both ways: 5734N @0.5MPa, 8028N @0.7MPa, and 10321N @0.9MPa. The air port is G1/2, the rod thread is M27x2, and adjustable air cushions are 40mm at each end. Operating speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X900
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X900 replacement — usually within 7-8 hours.