This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX85, 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 SI40AX85
The AirTAC SI40 Standard Cylinder SI40AX85 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 85mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX85, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX85
- 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 SI40AX85
The AirTAC SI40AX85 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 85mm stroke, delivering 628N push force at 0.5MPa through its G1/4 port. The direct replacement is the SAI40AX85, which matches the exact interface, bore, stroke, output force and mounting hardware of the legacy unit.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This specific SKU uses an SUS420J2 stainless steel rod (A suffix) for corrosion resistance but lacks a magnet, meaning it cannot accept position sensors.
Airtac SI40 Standard Cylinder SI40AX85 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX85 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX85 |
| Bore size | Ø40 mm |
| Stroke | 85 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 SAI40AX85 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 SAI40AX85 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 SI40AX85
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×85 | 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 SI40AX85 Is Used
Stainless Rod Clamping
Ideal for repetitive part clamping in machining cells where the SUS420J2 stainless rod resists coolant spray and moisture better than standard carbon steel.
Package Diverting
Provides reliable 85mm stroke actuation for light-duty diverters and sorting gates, applying up to 628N of push force at 0.5MPa.
Pallet Stops
Functions as a compact 40mm bore pneumatic stop in low-profile material handling lines, safely halting loads under 377N.
Replacing the Airtac SI40 Standard Cylinder SI40AX85 with the SAI40AX85
To replace the SI40AX85, order the SAI40AX85. Confirm the ISO 15552 mounting interface, the 85mm stroke, the G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU lacks the -S magnet suffix, it cannot support CS1-B or DS1-B sensors; if sensing is required, switch to a magnet-equipped SAI40X85S. If you need to size up or down, the neighboring 32mm bore provides 402N push at 0.5MPa, while the 50mm bore offers 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding consider an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX85
- ✓ 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 SI40AX85 FAQ
Yes, the AirTAC SI40AX85 is discontinued. The direct replacement is the SAI40AX85. It is a true ISO 15552 profile cylinder that matches the original 40mm bore, 85mm stroke, 628N force, G1/4 port, and mounting dimensions, fitting directly into existing fixtures.
The 40mm bore operates on a G1/4 port and provides 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 features a 16mm rod with an M12x1.25 thread and adjustable 27mm air cushions.
Request a Quote for the SAI40AX85
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX85 replacement — usually within 7-8 hours.