This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X25, 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 SID40X25
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X25
- 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 SID40X25
The AirTAC SID40X25 is a double-acting double-rod ISO 15552 cylinder where a rod exits both ends on one piston, meaning push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This 40 mm bore unit features a 16 mm rod, M12x1.25 rod-end thread, G1/4 air port, and 27 mm adjustable air cushions at each end. The SID40X25 is discontinued and the direct replacement is the SAID40X25, which shares the identical interface, bore, stroke, and mounting. The SAI upgrade uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because both faces use the rod-side area, the equal both ways force provides anti-rotation stability and allows the back rod to drive a second tool. This non-magnet SKU cannot take a magnetic switch. A plain cylinder does not hold its load on air loss; the cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac SID Series Double-Rod Cylinder SID40X25 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X25 |
| Bore size | Ø40 mm |
| Stroke | 25 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 SAID40X25 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 SAID40X25 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 SID40X25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 SID40X25 Is Used
Dual-Tool Machining Station
Drives two opposing tools simultaneously from a single piston, utilizing the equal both ways force to machine parts on both ends with anti-rotation stability.
Symmetrical Transfer Gate
Shifts a transfer carriage equally in both directions on a conveyor line, using the 25 mm stroke to push and pull loads with identical 528 N @0.5 MPa force.
Compact Pinching Mechanism
Employs the twin rods to actuate a compact 40 mm bore pinching jaw where equal push and pull force is critical for releasing clamped components safely.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X25 with the SAID40X25
To replace the discontinued SID40X25, install the direct replacement SAID40X25 directly into your existing ISO 15552 mounting (Basic, FA, LB, or TC) without changing the G1/4 porting. Size both ways by verifying the 528 N @0.5 MPa equal force fits your load, or step to neighbour bores (32 mm or 50 mm) for different force profiles. A double rod is right when you need anti-rotation stability or a back rod to drive a second tool. This SKU lacks the -S magnet and cannot take a sensor. For stroke lengths >=300 mm, verify your side-load limits to prevent guide wear. Operating speed is 30-800 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X25
- ✓ 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 SID40X25 FAQ
Yes, the SID40X25 is discontinued. The direct replacement is the SAID40X25, which shares the identical ISO 15552 interface, 40 mm bore, 25 mm stroke, G1/4 port, and mounting hardware. The SAI family also adds SAIL and BSAI lock variants the SI line lacked.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The air port is G1/4. It features a 16 mm rod, M12x1.25 thread, and 27 mm adjustable cushions.
Request a Quote for the SAID40X25
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X25 replacement — usually within 7-8 hours.