This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X400, 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 SID125X400
The AirTAC Airtac SID Series Double-Rod Cylinder SID125X400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAID125X400
- 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 SID125X400
The AirTAC SID125X400 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring force is equal both ways at 5734 N @0.5 MPa, 8028 N @0.7 MPa, and 10321 N @0.9 MPa. This SKU has no -S magnet and cannot take a sensor. It features a 32 mm rod, M27x2 thread, G1/2 port, and 40 mm cushions. This legacy model is discontinued; the direct replacement is the SAID125X400, reusing the exact ISO 15552 mounting interface.
The SAID upgrade adds a two-piece Y-shaped piston seal for lower start-up pressure and longer life. A double rod prevents rotation and can drive two tools. Remember, air cushions only decelerate; use an external rod lock or SAIL/BSAI variant to hold loads.
Airtac SID Series Double-Rod Cylinder SID125X400 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID125X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X400 |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAID125X400 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 SAID125X400 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 SID125X400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SID125X400 Is Used
Dual-Station Conveyor Transfer
Drives two opposing pushers simultaneously from one piston, using the equal both-ways force to index parts off a conveyor belt without rotational drift.
Machining Center Loader
Loads and unloads parts from a CNC chuck using both rod ends, benefiting from the anti-rotation properties of the double-rod design during heavy 5734 N transfers.
Palletizing Head Manipulator
Actuates a gripper carriage where the rear rod acts as a stable tracking cam, while the front rod handles the 292 kg vertical lift capacity at 0.5 MPa.
Replacing the Airtac SID Series Double-Rod Cylinder SID125X400 with the SAID125X400
To replace the discontinued SID125X400, install the direct replacement SAID125X400, which matches the 125 mm bore, 400 mm stroke, G1/2 port, and ISO 15552 mounting footprint. Choose a double-rod cylinder when you need equal force both ways, anti-rotation stability, or a back rod to carry a sensor cam. If sizing both ways, verify force against neighbor bores: the 100 mm bore provides 3681 N @0.5 MPa, while the 160 mm bore provides 9425 N @0.5 MPa. Mounting options include Basic, FA, LB, and TC. Since the stroke is 400 mm, use external guides to prevent rod bending under side loads. This non-magnetic SKU cannot support switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID125X400
- ✓ 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 SID125X400 FAQ
Yes, the AirTAC SID125X400 is discontinued. The direct replacement is the SAID125X400. It shares the same ISO 15552 interface, 125 mm bore, 400 mm stroke, G1/2 port, and equal both-ways force, but adds an upgraded two-piece Y-shaped piston seal for longer life.
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. Operating speed is 30-500 mm/s. The cylinder uses a G1/2 port and 40 mm adjustable cushions. It does not hold loads without live air; use an external rod lock for held loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAID125X400
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X400 replacement — usually within 7-8 hours.