This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX80, 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 SI40BX80
The AirTAC Airtac SI40 Standard Cylinder SI40BX80 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX80, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX80
- 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 SI40BX80
The AirTAC SI40BX80 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 80mm stroke. Featuring a SUS304 stainless piston rod, G1/4 port and M12x1.25 thread, it delivers 628N push force at 0.5MPa. The direct replacement is the SAI40BX80, matching the exact interface, force and port size.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This SKU lacks a magnet, so it cannot take a sensor. For load holding, use external rod locks, as cushions only decelerate.
Airtac SI40 Standard Cylinder SI40BX80 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX80 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX80 |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAI40BX80 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 SAI40BX80 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 SI40BX80
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SI40BX80 Is Used
Stainless Rod Clamping
Ideal for packaging machinery requiring a corrosion-resistant SUS304 rod, providing 628N of clamping force at 0.5MPa.
Short-Stroke Diversion
The 80mm stroke handles diverting or sorting tasks on conveyors, moving loads safely under the 377N working limit.
ISO 15552 Fixture Direct
Drops directly into existing ISO 15552 fixtures via standard foot or flange mounts, using the G1/4 air port.
Replacing the Airtac SI40 Standard Cylinder SI40BX80 with the SAI40BX80
To replace this SI40BX80 with the SAI40BX80, confirm the ISO 15552 mounting dimensions, 40mm bore, 80mm stroke, G1/4 port, and SUS304 rod. Size both ways: the neighbouring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. This non-magnetic SKU cannot accept CS1-B/DS1-B switches. For load holding on air loss, the cushion only decelerates; specify an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX80
- ✓ 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 SI40BX80 FAQ
Yes, the SI40BX80 is discontinued. The direct replacement is the SAI40BX80. It shares the same ISO 15552 mounting interface, 40mm bore, 80mm stroke, G1/4 port, and force ratings, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 port. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Request a Quote for the SAI40BX80
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX80 replacement — usually within 7-8 hours.