This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X125, 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 SID40X125
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X125
- 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 SID40X125
The AirTAC SID40X125 is a double-acting, double-rod ISO 15552 cylinder featuring a 40mm bore and 125mm stroke. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal at 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. This model is discontinued and the direct replacement is the SAID40X125, matching the G1/4 port, M12x1.25 rod thread, and 27mm adjustable cushion. The SAI upgrade uses an improved two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The twin rods prevent rotation and let the back rod carry a sensor cam or drive a second tool. Note this SKU lacks the -S magnet and cannot take a switch. A plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID40X125 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X125 |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID40X125 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAID40X125 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 SID40X125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SID40X125 Is Used
Twin-Tool Synchronization
Drives two opposing operations simultaneously using both rod ends, ensuring perfectly matched timing without adding a second cylinder.
Anti-Rotation Guiding
The dual-rod geometry resists torsional twist under offset loads, maintaining precise linear tracking for handling rigid workpieces.
Symmetrical Transfer
Pushes and pulls a shuttle across a conveyor with identical 528N force both ways, keeping balanced momentum in reversing cycles.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X125 with the SAID40X125
To replace the discontinued SID40X125, use the SAID40X125 direct: it preserves the ISO 15552 mounting interface, 125mm stroke, and equal both-ways force. Size both ways by checking neighbour bores (32mm or 50mm) against your force needs, knowing the 40mm bore delivers 528N @0.5MPa. A double rod is right when you need anti-rotation or a back rod to drive a second tool. Reuse FA, LB, or TC mounts. This non-magnetic SKU cannot take a switch. For stroke lengths over 300mm, account for side-load deflection.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X125
- ✓ 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 SID40X125 FAQ
Yes, the SID40X125 is discontinued. The direct replacement is the SAID40X125, which matches the ISO 15552 interface, bore, stroke, G1/4 port, and equal both-ways force.
Force is equal both ways: 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. The air port is G1/4, the rod thread is M12x1.25, and it has a 27mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X125
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X125 replacement — usually within 7-8 hours.