This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X75S, 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 SID50X75S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X75S
- 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 SID50X75S
The AirTAC SID50X75S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Because both faces use the identical rod-side annular area, push and pull force are equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore 50 mm model features a 20 mm piston rod, M16x1.5 rod-end thread, 30 mm adjustable air cushions at each end, and a fixed G1/4 air port. This SID variant is discontinued and end-of-life; the direct replacement is the SAID50X75S, retaining the same ISO 15552 mounting interface, bore, stroke, and force.
The SAID upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life, while the SAI family adds SAIL air-released lock, SAIF built-in 4M valve, and BSAI clamp-lock variants the SI line lacked. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that a plain cylinder does not hold its load on air loss; the cushion only decelerates near stroke end, so use an external rod lock or pilot-operated check valve for held loads.
Airtac SID Series Double-Rod Cylinder SID50X75S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X75S |
| Bore size | Ø50 mm |
| Stroke | 75 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 SAID50X75S 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 SAID50X75S 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 SID50X75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SID50X75S Is Used
Synchronized Tool Driving
Drives two opposing work tools simultaneously from a single piston, utilizing the equal both ways 1154 N @0.7 MPa force for balanced machining or forming operations.
Anti-Rotation Diverting
The twin-rod geometry prevents piston rotation during extend and retract, ensuring precise alignment when diverting packages on a high-speed conveyor line.
External Cam Sensing
Uses the rear protruding rod to carry an external sensor cam, freeing the primary front rod face to perform dedicated clamping or positioning tasks.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X75S with the SAID50X75S
To replace the discontinued SID50X75S, install the direct replacement SAID50X75S, which matches the ISO 15552 interface, G1/4 port, and 75 mm stroke exactly. Size both ways by confirming the equal push/pull force fits your motion profile; if you need more force, the neighbouring bore 63 offers 1402 N @0.5 MPa, or step down to bore 40 for 528 N. A double rod is right when you need anti-rotation stability, a back rod to carry a sensor cam, or the ability to drive two tools in opposite directions simultaneously. Mounting options include Basic, FA, LB, and TC brackets. The -S magnet enables position sensing, and because the stroke is under 300 mm, side-load stress is minimal.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X75S
- ✓ 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 SID50X75S FAQ
Yes, the AirTAC SID50X75S is discontinued. The direct replacement is the SAID50X75S, which shares the same ISO 15552 mounting interface, 50 mm bore, 75 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. Operating pressure is 0.15-1.0 MPa, and speed ranges from 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X75S replacement — usually within 7-8 hours.