This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80BX40, 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 SI80 Standard Air Cylinder SI80BX40
The AirTAC SI80 Standard Air Cylinder SI80BX40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 40mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80BX40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke40 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80BX40
- 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 SI80 Standard Air Cylinder SI80BX40
The AirTAC SI80BX40 is a discontinued double-acting ISO 15552 profile cylinder with an 80mm bore and 40mm stroke. It delivers 2513N push and 2268N pull at 0.5MPa, peaking at 513kgf. The direct replacement is the SAI80BX40, which retains the exact G3/8 port, M20x1.5 thread, and 36mm cushion. This B-code variant features a SUS304 stainless piston rod for corrosion resistance, but lacks a magnet, so it cannot accept position switches.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If you need holding power, note that standard air cushions only decelerate; you must use an external rod lock or the SAIL/BSAI lock variants.
Airtac SI80 Standard Air Cylinder SI80BX40 Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80BX40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80BX40 |
| Bore size | Ø80 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI80BX40 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80BX40 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80BX40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×40 | 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 SI80 Standard Air Cylinder SI80BX40 Is Used
Stainless Rod Clamping
Ideal for short-stroke clamping in washdown areas where the SUS304 rod resists corrosion while delivering 2513N of secure holding force.
Transfer Diverters
Provides robust 80mm bore actuation for diverting heavy packages on conveyor lines, utilizing the 40mm stroke for rapid gate movement.
Press Ejection
Handles short 40mm ejection strokes in manufacturing presses, safely moving parts with a 1508N working load at 0.5MPa.
Replacing the Airtac SI80 Standard Air Cylinder SI80BX40 with the SAI80BX40
To replace the SI80BX40, order the SAI80BX40 direct. It matches the ISO 15552 mounting interface, 80mm bore, 40mm stroke, G3/8 port, and M20x1.5 rod thread. Because this SKU has no -S suffix, it lacks a magnet and cannot support CS1-B/DS1-B sensors. If sensing is required, switch to an SAI80X40S equivalent. Sizing both ways: if force is tight, the neighboring 100mm bore offers 3927N push at 0.5MPa; if downsizing is possible, the 63mm bore provides 1559N. Remember that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify a SAIL or BSAI lock variant, or add a pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80BX40
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80BX40 FAQ
Yes, the AirTAC SI80BX40 is discontinued. The direct replacement is the SAI80BX40. It is dimensionally interchangeable per ISO 15552, retaining the same 80mm bore, 40mm stroke, 2513N force, G3/8 port, and SUS304 rod.
This double-acting 80mm bore cylinder features a G3/8 air port. It delivers 2513N push and 2268N pull at 0.5MPa, 3518N push at 0.7MPa, 4523N push at 0.9MPa, and a theoretical maximum of 513kgf at 1.0MPa.
Request a Quote for the SAI80BX40
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80BX40 replacement — usually within 7-8 hours.