This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X300S, 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 SID50X300S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X300S
- 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 SID50X300S
The AirTAC SID50X300S is a discontinued ISO 15552 double-acting double-rod cylinder. A Ø20 mm rod exits both ends of the aluminum barrel, meaning push and pull forces are equal both ways at 825 N @0.5 MPa. The direct replacement is the SAID50X300S, retaining the G1/4 port, M16x1.5 thread, and 300 mm stroke. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Because the second rod can carry a sensor cam or drive two tools simultaneously, anti-rotation stability improves over single-rod units. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant to hold loads without live air.
Airtac SID Series Double-Rod Cylinder SID50X300S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X300S |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAID50X300S 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 SAID50X300S 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 SID50X300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SID50X300S Is Used
Dual-Tool Transfer
Drives two synchronized workpieces from opposite rod ends to halve cycle times on packaging lines.
Anti-Rotation Lift
Uses the twin rods to resist torsional twist when elevating guided platens without external linear bearings.
Cam-Driven Sensing
Mounts a sensor cam on the rear rod to trigger legacy CS1-B/DS1-B position switches externally.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X300S with the SAID50X300S
To replace the discontinued SID50X300S, install the direct replacement SAID50X300S using the same ISO 15552 mounting interface (Basic, FA, LB, TC). Size both ways by confirming the 825 N @0.5 MPa equal force is sufficient, or step up to the 63 mm bore for 1402 N. A double rod is right when you need anti-rotation resistance or a back rod to mount a sensor cam. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. For this 300 mm stroke, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X300S
- ✓ 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 SID50X300S FAQ
Yes, the SID50X300S is discontinued. The direct replacement is the SAID50X300S, offering the same ISO 15552 interface, 50 mm bore, 300 mm stroke, G1/4 port, and equal both-ways force.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Speed is 30-800 mm/s. The bore uses a G1/4 port and 30 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X300S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X300S replacement — usually within 7-8 hours.