This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X85, 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 SI40X85
The AirTAC Airtac SI40 Standard Cylinder SI40X85 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 SAI40X85, 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 → SAI40X85
- 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 SI40X85
The AirTAC SI40X85 is a discontinued double-acting ISO 15552 profile cylinder with an 85 mm stroke. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40X85 direct cylinder, which shares the exact bore, force, G1/4 port, and mounting interface. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life.
Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. For load holding, note that standard cylinders drift without live air; use an external pilot check valve or the SAIL lock variant.
Airtac SI40 Standard Cylinder SI40X85 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X85 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X85 |
| 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 SAI40X85 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 SAI40X85 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 SI40X85
| 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 SI40X85 Is Used
Clamping Mechanisms
Provides reliable 628 N push force at 0.5 MPa for securing medium-duty workpieces during machining operations.
Package Diverting
Uses the 85 mm stroke to push lightweight to medium cartons off a main production line at speeds up to 800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X85 with the SAI40X85
To replace the SI40X85, order the SAI40X85. Verify your ISO 15552 mounting fixture (LB, FA, TC, etc.), the 85 mm stroke, and the G1/4 port. This non-magnetic SKU cannot support position sensing; if needed, order an SAI with the -S magnet for current AirTAC switches. Sizing both ways: the 40 mm bore gives 628 N push at 0.5 MPa, while a neighboring 50 mm bore yields 982 N. For load holding on air loss, the cushion only decelerates; add a pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X85
- ✓ 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 SI40X85 FAQ
Yes, the AirTAC SI40X85 is discontinued. The direct replacement is the SAI40X85. It features the same ISO 15552 mounting interface, 40 mm bore, 85 mm stroke, 628 N force, and G1/4 port, fitting directly into existing fixtures.
The bore is 40 mm with a G1/4 air port. Force output is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. It operates at 30-800 mm/s.
Request a Quote for the SAI40X85
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X85 replacement — usually within 7-8 hours.