This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X155S, 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 SID50X155S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X155S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 155mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X155S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X155S
- 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 SID50X155S
The AirTAC SID50X155S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This model is discontinued; the direct replacement is the SAID50X155S, which shares the same 50mm bore, 155mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI upgrade uses a two-piece Y-shaped piston seal for lower start-up pressure and longer life.
With a 20mm rod and M16x1.5 thread, the dual-rod design prevents rotation and allows a sensor cam on the back rod. Note that air cushions only decelerate; for load holding without live air, use an external rod lock or the SAIL/BSAI variants.
Airtac SID Series Double-Rod Cylinder SID50X155S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X155S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X155S |
| Bore size | Ø50 mm |
| Stroke | 155 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 SAID50X155S 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 SAID50X155S 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 SID50X155S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×155 | 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 SID50X155S Is Used
Gripper Actuation
Drives opposing grippers via the rear rod extension, ensuring synchronous part handling without rotational play.
Transfer Pusher
Equal push and pull force moves workpieces between conveyor stations, allowing the return stroke to perform useful work.
Dual-Tool Machining
Mounts a sensor cam on the back rod while the front rod drives a secondary tool, saving space in compact cells.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X155S with the SAID50X155S
To replace the discontinued SID50X155S, install the direct replacement SAID50X155S, matching the 50mm bore, 155mm stroke, G1/4 port, and ISO 15552 mounting. Size both directions by the equal force (825 N @0.5 MPa); if undersized, check the 63mm bore (1402 N @0.5 MPa) while reusing FA, LB, or TC mounts. Choose a double-rod cylinder when anti-rotation or a back-rod sensor cam is needed. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches. For this 155mm stroke, side-load is minimal, but for strokes >=300mm, ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X155S
- ✓ 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 SID50X155S FAQ
Yes, the SID50X155S is discontinued. The direct replacement is the SAID50X155S. It shares the same ISO 15552 interface, 50mm bore, 155mm stroke, G1/4 port, and mounting, but adds an upgraded piston seal.
The SID50X155S features a G1/4 air port and delivers equal force both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It operates at 0.15-1.0 MPa with a 20mm rod and M16x1.5 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X155S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X155S replacement — usually within 7-8 hours.