This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X40S, 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 SID50X40S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X40S
- 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 SID50X40S
The AirTAC SID50X40S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force are equal at 825 N @0.5 MPa. This discontinued model uses a 50mm bore, 40mm stroke, G1/4 port, and M16x1.5 rod thread. The direct replacement is the SAID50X40S, reusing the same ISO 15552 mounting interface and adjustable 30mm cushions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; for load holding without live air, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID50X40S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X40S |
| Bore size | Ø50 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID50X40S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAID50X40S 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 SID50X40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×40 | 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 SID50X40S Is Used
Inline Push-Pull Transfer
Equal both-ways force drives a conveyor diverter arm bidirectionally without force drop, utilizing the G1/4 port for rapid actuation.
Dual-Tool End Effector
The rear extension rod drives a secondary gripper or sensor cam simultaneously, saving space and synchronizing two tool actions in one 50mm bore unit.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X40S with the SAID50X40S
Replace the discontinued SID50X40S directly with the SAID50X40S, matching the 50mm bore, 40mm stroke, and G1/4 port. Size both ways using the equal push/pull force: 825 N @0.5, 1154 N @0.7, 1484 N @0.9 MPa. If more force is needed, step up to the 63mm bore (1402 N @0.5); if less, drop to the 40mm bore (528 N @0.5). A double rod is right when you need anti-rotation stability, or when the back rod carries a sensor cam. Mounting options include Basic, FA, LB, and TC. The -S magnet enables position sensing. For this 40mm stroke side-load is minimal, but for strokes >=300mm ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X40S
- ✓ 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 SID50X40S FAQ
Yes, the SID50X40S is discontinued. The direct replacement is the SAID50X40S. It shares the same ISO 15552 interface, 50mm bore, 40mm stroke, G1/4 port, and equal both-ways force, but adds an upgraded two Y-shaped one-way piston seal.
Force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Operating pressure is 0.15-1.0 MPa. Speed ranges 30-800 mm/s. The cylinder uses a G1/4 port and 30mm adjustable cushions. It will not hold a load on air loss; use an external rod lock for held loads.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X40S replacement — usually within 7-8 hours.