This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X50STC, 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 SID50X50STC
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X50STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X50STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X50STC
- 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 SID50X50STC
The AirTAC SID50X50STC is a discontinued 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, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a 50mm bore, 50mm stroke, G1/4 port, M16x1.5 rod thread, and 30mm adjustable cushions. The direct replacement is the SAID50X50STC, matching the interface, force, and mounting.
The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life. The double-rod design prevents rotation and lets the back rod carry a sensor cam. This -S model has a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SID Series Double-Rod Cylinder SID50X50STC Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X50STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X50STC |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAID50X50STC 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 SAID50X50STC 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 SID50X50STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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 SID50X50STC Is Used
Transfer Pusher
Equal both-ways force drives parts back and forth on a conveyor without stroke bias, using the TC mount for center trunnion support.
Gripper Actuator
The twin-rod anti-rotation特性 keeps the gripper aligned during clamping, preventing twist under high side loads.
Dual-Tool Drive
The rear rod carries a sensor cam or drives a secondary mechanism simultaneously, doubling output within the same 50mm bore.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X50STC with the SAID50X50STC
Replace the discontinued SID50X50STC directly with the SAID50X50STC, reusing your TC mount and ISO 15552 interface. Size both ways by checking neighbor bores (40mm or 63mm) while confirming equal both-ways force. A double rod is right when you need anti-rotation or a back-end sensor cam. If stroke reaches 300mm or more, verify side-load limits. The -S suffix provides a magnet for legacy CS1-B/DS1-B sensors. For load holding, note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X50STC
- ✓ 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 SID50X50STC FAQ
Yes, the SID50X50STC is discontinued. The direct replacement is the SAID50X50STC, offering the same ISO 15552 interface, 50mm bore, 50mm stroke, G1/4 port, and TC mounting compatibility.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore is 50mm with a G1/4 air port, M16x1.5 rod thread, and 30mm adjustable cushions. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X50STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X50STC replacement — usually within 7-8 hours.