This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X50SN, 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 SID40X50SN
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X50SN 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 SAID40X50SN, 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 → SAID40X50SN
- 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 SID40X50SN
The AirTAC SID40X50SN is a discontinued double-acting double-rod ISO 15552 cylinder featuring a 40mm bore, 50mm stroke, and G1/4 air port. A rod exits both ends on one piston, meaning both faces use the rod-side area, so push and pull force are equal both ways at 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. The direct replacement is the SAID40X50SN, which reuses the same ISO 15552 mounting interface, bore, stroke, and porting. The SAI family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
The rear rod can carry a sensor cam or drive two tools simultaneously, offering anti-rotation benefits. The -S magnet supports legacy CS1-B/DS1-B switches, while the -N NBR seal handles -20 to +70 C. 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 SID40X50SN Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X50SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X50SN |
| 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 SAID40X50SN 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 SAID40X50SN 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 SID40X50SN
| 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 SID40X50SN Is Used
Synchronized Tool Driving
Drives two opposing tools simultaneously from one piston, utilizing the equal both ways force to machine or form parts from both ends with precise 528N @0.5MPa control.
Anti-Rotation Transfer
Moves parts along a conveyor without rotational drift, using the dual-rod geometry to maintain strict orientation during the 50mm transfer stroke.
Dual-Sensor Positioning
Uses the front rod for work handling while the rear rod carries a sensor cam, allowing external position confirmation without interfering with the primary 40mm bore work area.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X50SN with the SAID40X50SN
To replace the discontinued SID40X50SN, order the SAID40X50SN direct; it matches the 40mm bore, 50mm stroke, G1/4 port, and FA/LB/TC mounting interface. Size both ways using the equal both ways force: if 528N @0.5MPa is insufficient, step up to the 50mm bore (825N), or drop to the 32mm bore (345N) if lower. A double rod is right when you need anti-rotation, a back rod for a sensor cam, or to drive two tools. The -S magnet works with legacy CS1-B/DS1-B switches. For this 50mm stroke, side-load is minimal, but for stroke >=300mm ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X50SN
- ✓ 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 SID40X50SN FAQ
Yes, the SID40X50SN is discontinued. The direct replacement is the SAID40X50SN, which matches the 40mm bore, 50mm stroke, G1/4 port, and ISO 15552 mounting interface.
Force is equal both ways at 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. Speed is 30-800mm/s, with a 27mm adjustable air cushion at each end and a 16mm rod.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X50SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X50SN replacement — usually within 7-8 hours.