This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X250S, 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 SID50X250S
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X250S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X250S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X250S
- 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 SID50X250S
The AirTAC SID50X250S is a discontinued ISO 15552 double-rod, double-acting cylinder featuring a 50mm bore and 250mm stroke. A piston rod exits both ends, meaning push and pull forces are equal both ways at 825N @0.5 MPa, 1154N @0.7 MPa, and 1484N @0.9 MPa. It has a 20mm rod, M16x1.5 thread, G1/4 port, and 30mm adjustable cushions. The direct replacement is the SAID50X250S, which reuses the same mounting interface and adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
Because the second rod acts as an anti-rotation guide and can carry a sensor cam for the built-in -S magnet (compatible with legacy CS1-B/DS1-B switches), it is ideal for precise driving. Note that air cushions only decelerate; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID50X250S Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X250S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X250S |
| Bore size | Ø50 mm |
| Stroke | 250 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 SAID50X250S 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 SAID50X250S 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 SID50X250S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 SID50X250S Is Used
Gripper Synchronization
Uses the equal both ways force to drive opposing grippers or two external tools simultaneously without a single-rod push imbalance.
Anti-Rotation Guiding
The dual exiting rods prevent mechanical twist during the 250mm travel, maintaining precise alignment for machining or pressing.
Transfer Pusher
Deploys the rear rod as a sensor cam target while the front rod pushes parts, keeping the 50mm bore motion stable and tracked.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X250S with the SAID50X250S
To replace the discontinued SID50X250S, install the direct replacement SAID50X250S, matching the 50mm bore, 250mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). Size both directions by the equal-both-ways force: if 1154N @0.7 MPa is insufficient, step up to the 63mm bore (1962N); if oversized, drop to the 40mm bore (739N). Choose a double-rod cylinder when you need anti-rotation stability or a back rod to drive a second tool. Select the -S magnet for position sensing. For this 250mm stroke, ensure the side-load moment is within the bearing capacity. Speed is 30-800 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X250S
- ✓ 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 SID50X250S FAQ
Yes, the SID50X250S is discontinued. The direct replacement is the SAID50X250S, which shares the same ISO 15552 interface, 50mm bore, 250mm stroke, G1/4 port, and equal both ways force.
The G1/4 port cylinder delivers equal both ways force of 825N @0.5 MPa, 1154N @0.7 MPa, and 1484N @0.9 MPa. It operates at 0.15-1.0 MPa with a 30mm adjustable cushion.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X250S
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X250S replacement — usually within 7-8 hours.