This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X350SLB, 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 SID40X350SLB
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X350SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X350SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X350SLB
- 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 SID40X350SLB
The AirTAC SID40X350SLB is a discontinued ISO 15552 double-acting double-rod cylinder. A rod exits both ends on one piston, meaning both faces use the rod-side area and push and pull force are equal (528 N at 0.5 MPa). The direct replacement is the SAID40X350SLB, matching the 40mm bore, 350mm stroke, G1/4 port, and LB mounting interface. The SAI upgrade uses a two-piece Y-shaped piston seal for low start-up pressure and long life.
With a 16mm rod and M12x1.25 thread, this cylinder delivers equal both-ways force of 739 N at 0.7 MPa and 950 N at 0.9 MPa. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. 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 SID40X350SLB Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X350SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X350SLB |
| Bore size | Ø40 mm |
| Stroke | 350 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID40X350SLB carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAID40X350SLB 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 SID40X350SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SID40X350SLB Is Used
Dual-End Transfer Pusher
Drives a transfer carriage on a conveyor using both rod ends to push and retract equal loads without requiring a separate return mechanism.
External Cam Positioning
Uses the rear exiting rod to carry a sensor cam, allowing external position confirmation while the front rod performs the primary work.
Anti-Rotation Gripper
Handles flat materials where the twin rods prevent piston rotation, ensuring the end-of-arm tooling maintains precise angular alignment.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X350SLB with the SAID40X350SLB
To replace the discontinued SID40X350SLB, swap it directly with the SAID40X350SLB, reusing the existing ISO 15552 LB mounting and G1/4 porting. Size both directions by the equal force: 528 N at 0.5 MPa, or step up to a 50mm bore if higher force is needed. A double rod is right when you need anti-rotation, a back rod to carry a sensor cam, or to drive two tools. Because stroke is 350mm, add external guides to prevent rod bending under side loads. The -S magnet works with legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X350SLB
- ✓ 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 SID40X350SLB FAQ
Yes, the SID40X350SLB is discontinued. The direct replacement is the SAID40X350SLB, which shares the same ISO 15552 interface, 40mm bore, 350mm stroke, LB mount, and G1/4 port.
Because it is a double-rod cylinder, force is equal both ways: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa. The air port is G1/4, the rod is 16mm with an M12x1.25 thread, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X350SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X350SLB replacement — usually within 7-8 hours.