This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X85S, 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 SID40X85S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X85S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 85mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X85S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X85S
- 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 SID40X85S
The AirTAC SID40X85S is a discontinued double-acting double-rod ISO 15552 cylinder where a Ø16 mm rod exits both ends, ensuring force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa and 950 N @0.9 MPa. It features a G1/4 port, M12x1.25 rod thread and 27 mm adjustable cushions. The direct replacement is the SAID40X85S, which reuses the same ISO 15552 mounting interface and adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
Because both faces use the rod-side area, the back rod can carry a sensor cam or drive two tools simultaneously while resisting rotation. Note that 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 SID40X85S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X85S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X85S |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAID40X85S 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 SAID40X85S 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 SID40X85S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SID40X85S Is Used
Dual-Tool Machining Station
Drives two opposing machining heads from one piston, utilizing the equal both-ways 739 N @0.7 MPa force to maintain perfectly balanced cutting pressure.
Symmetric Transfer Gate
Shifts a diverting gate from either end with identical push and pull energy, preventing rotation and ensuring stable product routing.
External Cam Positioning
Uses the rear exiting rod to trigger legacy CS1-B/DS1-B sensors directly, providing a compact feedback signal without extra internal space.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X85S with the SAID40X85S
To replace the discontinued SID40X85S, swap in the SAID40X85S directly, keeping the existing FA, LB or TC mounts and G1/4 plumbing. Size both ways by matching the equal push/pull force; if upgrading to a neighbour bore, recalculate both directions. Choose a double-rod design when you need anti-rotation, a back-end sensor cam or dual-tool driving. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. For this 85 mm stroke side-load is minimal, but for any stroke >=300 mm ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X85S
- ✓ 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 SID40X85S FAQ
Yes, the SID40X85S is discontinued. The direct replacement is the SAID40X85S. It shares the same ISO 15552 interface, 40 mm bore, 85 mm stroke, G1/4 port and mounting, but adds an upgraded piston seal.
As 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 Ø16 mm with an M12x1.25 thread, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X85S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X85S replacement — usually within 7-8 hours.