This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X70S, 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 SID40X70S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X70S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 70mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X70S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke70 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X70S
- 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 SID40X70S
The AirTAC SID40X70S is a discontinued ISO 15552 double-acting double-rod cylinder where a rod exits both ends, making push and pull force equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm, the piston rod is Ø16 mm with an M12x1.25 thread, the air port is G1/4, and adjustable air cushions are 27 mm at each end. The direct replacement is the SAID40X70S, which shares the same mounting interface, bore, stroke, and force.
Because both faces use the rod-side area, the back rod can carry a sensor cam for mid-stroke positioning without taking up front tool space. The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. This plain cylinder does not hold a load on air loss; the 27 mm 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 SID40X70S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X70S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X70S |
| Bore size | Ø40 mm |
| Stroke | 70 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 SAID40X70S 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 SAID40X70S 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 SID40X70S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SID40X70S Is Used
Dual-Tool Machining Station
Drives two opposing tools simultaneously from one piston, using the equal both ways force to machine parts on both ends efficiently.
Anti-Rotation Transfer Gate
Uses the twin rods exiting both ends to prevent mechanical rotation, ensuring a perfectly straight transfer of workpieces between belts.
Symmetric Clamping Fixture
Clamps components equally from both directions with 528 N @0.5 MPa, maintaining precise center alignment without differential forces.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X70S with the SAID40X70S
To replace the discontinued SID40X70S, swap it directly for the SAID40X70S; the ISO 15552 mounting interface, 70 mm stroke, G1/4 port, and 528 N @0.5 MPa equal-both-ways force are identical. If you need slightly more or less force, check the neighbouring 32 mm bore (345 N @0.5 MPa) or 50 mm bore (825 N @0.5 MPa), keeping in mind both directions yield the same output. A double-rod design is the right choice when you need anti-rotation stability or want to drive two tools from one piston. Mounting options include Basic, FA, LB, and TC brackets. The -S suffix means the piston has a built-in magnet for legacy CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 70 mm stroke, side-load is minimal, but for any stroke over 300 mm, add guide rails to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X70S
- ✓ 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 SID40X70S FAQ
Yes, the AirTAC SID40X70S is discontinued. The direct replacement is the SAID40X70S. It shares the same ISO 15552 interface, 40 mm bore, 70 mm stroke, G1/4 port, and equal both ways force. The SAI family also adds upgraded piston seals and SAIL/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. It operates at 0.15-1.0 MPa with a speed range of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X70S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X70S replacement — usually within 7-8 hours.