This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X350S, 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 SID50X350S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X350S
- 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 SID50X350S
The AirTAC SID50X350S is a discontinued double-acting double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a 50mm bore, 350mm stroke, G1/4 air port, M16x1.5 rod thread, and 30mm adjustable cushions. The direct replacement is the SAID50X350S, matching the interface, bore, stroke, and mounting.
The SAI upgrade uses an upgraded two Y-shaped one-way piston seal for low start-up pressure. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B sensors. Note that air cushions only decelerate near stroke end; a plain cylinder drifts on air loss, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SID Series Double-Rod Cylinder SID50X350S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X350S |
| Bore size | Ø50 mm |
| Stroke | 350 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 SAID50X350S 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 SAID50X350S 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 SID50X350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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 SID50X350S Is Used
Synchronized Transfer Pusher
Drives two parallel conveyor lanes simultaneously using both rod ends, ensuring perfectly timed part transfers without adding a secondary cylinder.
Anti-Rotation Gripper Slide
The twin-rod architecture prevents mechanical twist during rapid clamping, maintaining precise jaw alignment on machining centers.
External Cam Positioning
The rear protruding rod acts as a linear cam to mechanically trigger legacy CS1-B/DS1-B limit switches for end-of-stroke confirmation.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X350S with the SAID50X350S
To replace the discontinued SID50X350S, install the direct replacement SAID50X350S, which retains the ISO 15552 mounting interface, G1/4 port, and equal both-ways force. When sizing, verify both directions handle the load; if you need more force, step up to the 63mm bore (1962 N @0.7 MPa), or drop to the 40mm bore (739 N @0.7 MPa) for lighter tasks. A double rod is right when you need anti-rotation, a back rod to carry a sensor cam, or to drive two tools. Reuse FA, LB, or TC mounts. The -S magnet works with legacy CS1-B/DS1-B switches. For the 350mm stroke, add external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X350S
- ✓ 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 SID50X350S FAQ
Yes, the SID50X350S is discontinued. The direct replacement is the SAID50X350S. It matches the ISO 15552 interface, 50mm bore, 350mm stroke, G1/4 port, and mounting hardware, while adding an upgraded piston seal for lower start-up pressure.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4, the rod thread is M16x1.5, and it has 30mm adjustable cushions at each end. Operating pressure is 0.15-1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X350S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X350S replacement — usually within 7-8 hours.