This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X900S, 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 SID50X900S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X900S
- 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 SID50X900S
The AirTAC SID50X900S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring push and pull force is equal both ways (825 N at 0.5 MPa). This 50 mm bore model features a 20 mm piston rod, M16x1.5 rod thread, and G1/4 air ports. With a 900 mm stroke, it operates at 30-800 mm/s and includes 30 mm adjustable air cushions at each end. This SID series is discontinued; the direct replacement is the SAID50X900S, which reuses the same ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because the rear rod can carry a sensor cam or drive a second tool simultaneously, the design offers excellent anti-rotation stability. The built-in magnet (-S) supports legacy CS1-B/DS1-B switches. Note that air cushions only decelerate the piston near stroke end; they do not hold loads on air loss, so an external rod lock or SAIL/BSAI variant is required for held loads.
Airtac SID Series Double-Rod Cylinder SID50X900S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X900S |
| Bore size | Ø50 mm |
| Stroke | 900 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 SAID50X900S 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 SAID50X900S 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 SID50X900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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 SID50X900S Is Used
Equal-Force Transfer
Drives a conveyor diverting gate where the 825 N equal both-ways force ensures consistent actuation speed and power whether pushing or pulling the mechanism.
Dual-Tool Machining
Uses the second protruding rod to simultaneously drive a secondary machining head or clamp, keeping cycle times synchronized without adding a separate cylinder.
Anti-Rotation Lift
Lifts vertically guided platens in a packaging line where the double-rod construction prevents twist and ensures smooth 900 mm travel without binding.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X900S with the SAID50X900S
To replace the discontinued SID50X900S, install the direct replacement SAID50X900S, which matches the 50 mm bore, 900 mm stroke, G1/4 port, and ISO 15552 mounting footprint without bracket changes. When sizing, verify the equal both-ways force (825 N at 0.5 MPa, 1154 N at 0.7 MPa) is sufficient; if more force is needed, step up to the 63 mm bore. A double-rod cylinder is the right choice when you need equal push/pull force, anti-rotation resistance, or a back rod to mount a sensor cam. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches. For this 900 mm stroke, external guides are strongly recommended to prevent rod bending and manage side loads. Mounting options include Basic, FA, LB, and TC styles.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X900S
- ✓ 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 SID50X900S FAQ
Yes, the SID50X900S is discontinued. The direct replacement is the SAID50X900S. It shares the same ISO 15552 interface, 50 mm bore, 900 mm stroke, G1/4 port, and equal both-ways force, but features an upgraded piston seal for longer life.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Operating speed is 30-800 mm/s. The cylinder uses a G1/4 port and 30 mm adjustable cushions at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X900S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X900S replacement — usually within 7-8 hours.