This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID40X235, 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 SID40X235
The AirTAC Airtac SID Series Double-Rod Cylinder SID40X235 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 235mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID40X235, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke235 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAID40X235
- 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 SID40X235
The AirTAC SID40X235 is a discontinued ISO 15552 double-acting double-rod cylinder with a 40mm bore and 235mm stroke. Because a rod exits both ends, the effective piston area is identical in both directions, yielding equal push and pull force (528N at 0.5MPa). The direct replacement is the SAID40X235, matching the G1/4 port, M12x1.25 rod thread, and mounting interface. The SAI family upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
This non-magnetic SKU cannot accept a sensor switch. Note that a standard cylinder does not hold loads on air loss; the 27mm adjustable cushions only decelerate near stroke end. For held loads, use an external rod lock or the SAIL/BSAI lock variants.
Airtac SID Series Double-Rod Cylinder SID40X235 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID40X235 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID40X235 |
| Bore size | Ø40 mm |
| Stroke | 235 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 SAID40X235 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 SAID40X235 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 SID40X235
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×235 | 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 SID40X235 Is Used
Synchronized Tool Driving
Drives two opposing tools simultaneously from a single piston, using the extended back rod to actuate a secondary mechanism with equal 528N force at 0.5MPa.
Equal-Force Transfer Pusher
Pushes and retracts workpieces on a conveyor with identical 739N force at 0.7MPa in both directions, ensuring consistent positioning regardless of travel direction.
Replacing the Airtac SID Series Double-Rod Cylinder SID40X235 with the SAID40X235
To replace the discontinued SID40X235, install the direct replacement SAID40X235, which retains the exact ISO 15552 mounting interface, 235mm stroke, and equal-both-ways force. When sizing, verify force in both directions against your load: this 40mm bore provides 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. If you need less force, the 32mm bore offers 345N at 0.5MPa; for more, the 50mm bore provides 825N at 0.5MPa. A double-rod design is right when you need anti-rotation stability, equal force both ways, or a back rod to drive a second tool. Mounting options include Basic, FA, LB, and TC. This SKU lacks the -S magnet and cannot take sensors. For this 235mm stroke, side-load is minimal, but for strokes >=300mm ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID40X235
- ✓ 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 SID40X235 FAQ
Yes, the AirTAC SID40X235 is discontinued. The direct replacement is the SAID40X235. It shares the same ISO 15552 interface, 40mm bore, 235mm stroke, G1/4 port, and equal-both-ways force. The SAI family also adds an upgraded two-piece Y-shaped piston seal for longer life.
Force is equal both ways (double-rod): 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. Operating speed is 30-800mm/s. The cylinder uses a G1/4 port, has a 16mm rod, and features 27mm adjustable air cushions at each end. It does not hold loads on air loss; use an external rod lock for holding.
Related AirTAC SAI Cylinders
Request a Quote for the SAID40X235
Send us the quantity and destination. We confirm price, stock and lead time on the SAID40X235 replacement — usually within 7-8 hours.