This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X155, 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 SID40X155
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X155 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 155mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X155, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X155
- 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 SID40X155
The AirTAC SID40X155 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, meaning both faces use the rod-side area and push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa and 950 N @0.9 MPa. This SKU is discontinued and end-of-life; the direct replacement is the SAID40X155, matching the 40 mm bore, 155 mm stroke, G1/4 port, M12x1.25 rod thread and 27 mm cushion. The SAI family uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life.
Because the second rod drives a sensor cam or a second tool while resisting rotation, a double-rod layout adds mechanical stability. This non-magnet SKU cannot take a magnetic switch. Operating pressure is 0.15-1.0 MPa (proof 1.5 MPa) across a -20 to +70 C range, with a Viton H seal option extending heat to 0-150 C.
Airtac SID Series Double-Rod Cylinder SID40X155 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X155 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X155 |
| Bore size | Ø40 mm |
| Stroke | 155 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 SAID40X155 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 SAID40X155 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 SID40X155
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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 SID40X155 Is Used
Dual-Tool End Effector
Drives two opposing grippers or tools simultaneously from one piston, utilizing the equal both-ways 739 N @0.7 MPa force for balanced part transfer.
Anti-Rotation Lift Station
The twin rod design prevents mechanical twist during vertical elevation, maintaining precise vertical alignment without external linear guides.
Symmetrical Sorting Diverter
Pushes product from either side of a belt using the G1/4 ported 40 mm bore, ensuring identical 528 N @0.5 MPa push and pull kinetics.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X155 with the SAID40X155
To replace the discontinued SID40X155, specify the SAID40X155, which reuses the exact ISO 15552 mounting interface and dimensions with no bracket changes. Size both ways by confirming the 528 N @0.5 MPa equal force is sufficient, or step to neighbour bores like 50 mm if higher thrust is needed. A double rod is right when you need anti-rotation stability or must drive two tools from one piston. Mounting choices include Basic, FA, LB and TC. This SKU lacks the -S magnet, so it cannot accept legacy CS1-B/DS1-B sensors. For this 155 mm stroke, side-load is minimal, but for strokes >=300 mm ensure guide alignment to prevent rod binding. A plain cylinder does not hold loads on air loss; use an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X155
- ✓ 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 SID40X155 FAQ
Yes, the AirTAC SID40X155 is discontinued and end-of-life. The direct replacement is the SAID40X155, which matches the 40 mm bore, 155 mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family also adds SAIL and BSAI lock variants the SI line lacked.
Force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The fixed air port is G1/4, the rod is Ø16 mm with an M12x1.25 thread, adjustable cushion is 27 mm, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X155
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X155 replacement — usually within 7-8 hours.