This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X400S, 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 SID40X400S
The AirTAC SID Series Double-Rod Cylinder SID40X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X400S
- 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 SID40X400S
The AirTAC SID40X400S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring 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 model features a 16 mm piston rod, M12x1.25 rod thread, G1/4 ports, and 27 mm adjustable cushions at each end. Because the SID series is discontinued, the direct replacement is the SAID40X400S, which retains the exact bore, stroke, and mounting interface. The SAI upgrade uses an improved two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Choosing this double-rod design provides anti-rotation stability and allows the back rod to carry a sensor cam or drive a second tool simultaneously. With a 400 mm stroke, external guides are recommended to prevent rod bending under side loads. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; an external rod lock or SAIL/BSAI variant is required to hold loads on air loss.
Airtac SID Series Double-Rod Cylinder SID40X400S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X400S |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAID40X400S 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 SAID40X400S 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 SID40X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SID40X400S Is Used
Dual-Station Transfer
Drives two opposing conveyor pick-off arms simultaneously using both extending rods, ensuring perfectly synchronized part ejection without adding external linkages.
Anti-Rotation Gripper Slide
Eliminates unwanted rotation during a 400 mm horizontal clamping travel, maintaining precise jaw alignment on a machining center without external linear guides.
Cam-Driven Sensing Station
Uses the rear protruding rod to mechanically trip a sequence of legacy limit switches, providing positive physical position feedback alongside the internal -S magnet.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X400S with the SAID40X400S
To replace the discontinued SID40X400S, install the direct replacement SAID40X400S, matching the 40 mm bore, 400 mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). The equal-both-ways force (528 N @0.5 MPa) remains identical, but if more thrust is needed, step up to the 50 mm bore (825 N @0.5 MPa). A double-rod cylinder is selected when equal push/pull force, anti-rotation resistance, or a back-rod sensor cam is required. Because the stroke is 400 mm, external guides must support side loads to prevent rod bending. The -S magnet works with legacy CS1-B/DS1-B switches. Remember, cushions only decelerate; use an external rod lock for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X400S
- ✓ 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 SID40X400S FAQ
Yes, the SID40X400S is discontinued. The direct replacement is the SAID40X400S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 400 mm stroke, G1/4 port, and equal-both-ways force. The SAI family also adds upgraded piston seals and lock variants like SAIL/BSAI that the SI line lacked.
Being a double-rod cylinder, the push and pull forces are equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It operates at 30-800 mm/s, uses G1/4 ports, and has 27 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X400S replacement — usually within 7-8 hours.