This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X50S, 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 SID40X50S
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X50S
- 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 SID40X50S
The AirTAC SID40X50S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on a single piston. This configuration means both faces use the rod-side area, 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, and the air port is G1/4. This SID model is discontinued; the direct replacement is the SAID40X50S, which retains the same ISO 15552 mounting interface, bore, stroke, and adjustable 27 mm air cushions.
Because the second rod can carry a sensor cam or drive two tools simultaneously while resisting rotation, the design suits precision handling. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Note that a plain cylinder drifts 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 SID40X50S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X50S |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAID40X50S 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 SAID40X50S 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 SID40X50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SID40X50S Is Used
Dual-Tool Transfer
Drives two independent end-effectors from one piston, using the equal both-ways 739 N @0.7 MPa force to push and pull loads simultaneously without thrust imbalance.
Anti-Rotation Gauge
The twin Ø16 mm rods prevent mechanical rotation during precision gauging, keeping the M12x1.25 threaded tooling perfectly aligned throughout the 50 mm travel.
Cam-Driven Sensing
Uses the rear protruding rod to carry a magnet for legacy CS1-B/DS1-B switches, freeing the primary G1/4 port side from obstructive sensor brackets.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X50S with the SAID40X50S
To replace the discontinued SID40X50S, specify the SAID40X50S, which is a direct match for the ISO 15552 interface, G1/4 port, and 27 mm cushion. Size both ways by confirming the 528 N @0.5 MPa equal force is sufficient, or step to the neighbouring 50 mm bore if more thrust is needed. A double rod is right when you need anti-rotation stability or a back rod to carry a sensor cam. Reuse FA, LB, or TC mounts. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAI uses current switches). For this 50 mm stroke side-load is minimal, but for strokes >=300 mm verify guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X50S
- ✓ 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 SID40X50S FAQ
Yes, the SID40X50S is discontinued. The direct replacement is the SAID40X50S. It shares the identical ISO 15552 interface, 40 mm bore, 50 mm stroke, G1/4 port, and mounting, but adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life.
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. Operating pressure is 0.15-1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X50S replacement — usually within 7-8 hours.