This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X235, 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 SI40 Standard Cylinder SI40X235
The AirTAC Airtac SI40 Standard Cylinder SI40X235 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 SAI40X235, 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 → SAI40X235
- 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 SI40 Standard Cylinder SI40X235
The AirTAC SI40X235 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 235mm stroke. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40X235 direct upgrade. The SAI retains the exact G1/4 port, M12x1.25 thread, and mounting interface, fitting existing fixtures perfectly.
This SKU lacks a magnet (-S) and cannot take a sensor. The SAI upgrade features two Y-shaped piston seals for low start-up pressure. For load holding, note that cushions only decelerate; use SAIL or BSAI lock variants.
Airtac SI40 Standard Cylinder SI40X235 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X235 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X235 |
| 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 SAI40X235 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 SAI40X235 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X235
| 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 SI40 Standard Cylinder SI40X235 Is Used
Package Diversion
Actuating routing gates on packaging lines where the 628N push force at 0.5MPa easily deflects standard cartons.
Clamp Actuation
Driving mid-force clamping mechanisms in CNC fixtures, utilizing the 235mm stroke to clear the work envelope.
Replacing the Airtac SI40 Standard Cylinder SI40X235 with the SAI40X235
To replace the SI40X235, order the SAI40X235. Confirm the ISO 15552 interface, 40mm bore, 235mm stroke, G1/4 port, and mounting accessory. Because this specific SKU has no -S suffix, it cannot accept a magnetic sensor; if position detection is needed, select an SAI40X235S and use current AirTAC switches. At 0.5MPa the 40mm bore yields 628N push and 528N pull; if more force is needed, the 50mm bore offers 982N push, while the 32mm bore provides 402N. For this 235mm stroke, ensure adequate guide support to prevent rod bending and side loads. A plain cylinder drifts on air loss; for held loads, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X235
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X235 FAQ
Yes, the AirTAC SI40X235 is discontinued. The direct replacement is the SAI40X235. It is dimensionally interchangeable per the ISO 15552 mounting interface, maintaining the same 40mm bore, 235mm stroke, output force, G1/4 port, and mounting accessories.
The SI40X235 has a G1/4 air port. Force ratings are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. It operates at 30-800mm/s with a 27mm adjustable cushion.
Request a Quote for the SAI40X235
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X235 replacement — usually within 7-8 hours.