This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X400S, 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 SID50X400S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X400S
- 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 SID50X400S
The AirTAC SID50X400S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, ensuring force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This bore 50 mm model features a 20 mm rod, M16x1.5 thread, 30 mm adjustable cushions, a G1/4 port, and a -S magnet for CS1-B/DS1-B switches. The SID line is discontinued; the direct replacement is the SAID50X400S, sharing the same interface, force, and mounting.
The SAID50X400S upgrade introduces 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 rear rod drive a second tool or sensor cam. Remember, air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for load holding.
Airtac SID Series Double-Rod Cylinder SID50X400S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X400S |
| Bore size | Ø50 mm |
| Stroke | 400 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 SAID50X400S 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 SAID50X400S 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 SID50X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SID50X400S Is Used
Transfer Pusher
Equal both-ways force drives parts off a conveyor belt on the extend stroke and retracts an empty tooling arm without losing push capacity.
Dual-End Machining
The second rod end carries a sensor cam or drives a secondary clamping fixture simultaneously, synchronizing two operations on one ISO 15552 mount.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X400S with the SAID50X400S
To replace the discontinued SID50X400S, install the direct replacement SAID50X400S, which matches the ISO 15552 mounting interface, G1/4 port, and 400 mm stroke. Because force is equal both ways, verify your push and pull requirements against the 825 N @0.5 MPa rating; if more force is needed, step up to the 63 mm bore, or drop to 40 mm for lighter loads. Choose a double-rod cylinder when anti-rotation or dual-tool driving is required. Reuse FA, LB, or TC mounts, and specify the -S magnet for CS1-B/DS1-B sensors. At 400 mm stroke, use external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X400S
- ✓ 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 SID50X400S FAQ
Yes, the SID50X400S is discontinued. The direct replacement is the SAID50X400S, offering the same ISO 15552 interface, 50 mm bore, 400 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 speed is 30-800 mm/s. It uses a G1/4 port and 30 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X400S replacement — usually within 7-8 hours.