This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X20S, 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 SID40X20S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 20mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke20 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X20S
- 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 SID40X20S
The AirTAC SID40X20S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Both faces use the rod-side area, so push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This SID model is discontinued and the direct replacement is the SAID40X20S, matching the 40mm bore, 20mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI upgrade uses an improved two Y-shaped one-way piston seal for low start-up pressure and long life.
The Ø16mm piston rod uses an M12x1.25 thread, with a 27mm adjustable air cushion at each end. A key double-rod benefit is anti-rotation, and the back rod can carry a sensor cam or drive two tools. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; for held loads use SAIL/BSAI lock variants or an external rod lock.
Airtac SID Series Double-Rod Cylinder SID40X20S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X20S |
| Bore size | Ø40 mm |
| Stroke | 20 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 SAID40X20S 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 SAID40X20S 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 SID40X20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SID40X20S Is Used
Synchronized Tool Driving
Uses both extending rods to drive two separate work tools simultaneously with equal 528 N @0.5 MPa force, ensuring perfectly synchronized machining or clamping operations.
Anti-Rotation Guiding
The dual-rod architecture prevents piston rotation during transit, ideal for precise linear positioning tasks where a single rod might twist under offset loads.
Symmetrical Transfer
Pushes and pulls parts across a conveyor with identical force and speed in both directions, maintaining consistent cycle times without requiring external guides.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X20S with the SAID40X20S
To replace the discontinued SID40X20S, specify the SAID40X20S, which is a direct swap retaining the ISO 15552 mounting interface, 40mm bore, 20mm stroke, and G1/4 port. Size both ways by verifying the equal force fits your load, or step to neighbour bores (32mm or 50mm) if margins allow. Choose a double-rod cylinder when anti-rotation, multi-tool driving, or symmetrical stroke is required. Mounting options include Basic, FA, LB, and TC. The -S magnet supports legacy CS1-B/DS1-B sensors. For stroke lengths >=300mm, verify side-load bearing limits.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X20S
- ✓ 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 SID40X20S FAQ
Yes, the SID40X20S is discontinued. The direct replacement is the SAID40X20S, offering the same ISO 15552 interface, 40mm bore, 20mm stroke, G1/4 port, and mounting. The SAI family also adds SAIL and BSAI lock variants.
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, the rod is Ø16mm with an M12x1.25 thread, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X20S replacement — usually within 7-8 hours.