This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80CB, 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 SI40X80CB
The AirTAC SI40 Standard Cylinder SI40X80CB 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 SAI40X80CB, 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 → SAI40X80CB
- 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 SI40X80CB
The AirTAC SI40X80CB is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 80mm stroke, delivering 628N push force at 0.5MPa via a G1/4 port. Because this legacy SI unit is end-of-life, AirTAC specifies the SAI40X80CB as the direct replacement. It shares the same CB clevis mounting, M12x1.25 rod thread, and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this specific SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. If you need load holding on air loss, look at the SAIL lock or BSAI clamp-lock variants, as standard cushions only decelerate.
Airtac SI40 Standard Cylinder SI40X80CB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80CB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80CB |
| 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 SAI40X80CB 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 SAI40X80CB 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 SI40X80CB
| 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 SI40X80CB Is Used
Clamp Actuation
Provides repeatable clamping of light aluminium extrusions in a machining cell, taking advantage of the 628N push force at 0.5MPa.
Gate Control
Operates a gravity roller lane gate for part routing, with the ISO 15552 profile barrel offering durable, compact integration.
Replacing the Airtac SI40 Standard Cylinder SI40X80CB with the SAI40X80CB
To replace the discontinued SI40X80CB, order the SAI40X80CB. Confirm the ISO 15552 mounting interface, the 40mm bore, 80mm stroke, G1/4 port, and CB clevis accessory. This SKU has no magnet (-S), meaning no CS1-B/DS1-B sensor can be fitted. If you need more force, the neighbouring 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore gives 402N. Remember that a plain cylinder drifts without live air—the cushion only decelerates—so use an external pilot check valve or the SAIL lock variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80CB
- ✓ 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 SI40X80CB FAQ
Yes, the SI40X80CB is discontinued. The direct replacement is the SAI40X80CB. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 80mm stroke, CB clevis mount, G1/4 port, and force ratings.
This double-acting cylinder has a 16mm rod, M12x1.25 thread, 27mm adjustable cushions, and operates at 30-800 mm/s. Force ratings are: 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a 128 kgf maximum at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80CB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80CB replacement — usually within 7-8 hours.