This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX800, 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 SI40BX800
The AirTAC Airtac SI40 Standard Cylinder SI40BX800 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX800, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX800
- 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 SI40BX800
The AirTAC SI40BX800 is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 800mm stroke, and a SUS304 stainless steel rod. Delivering 628 N push at 0.5 MPa, it is replaced by the SAI40BX800. This direct upgrade shares the exact G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface.
The SAI upgrade utilizes two Y-shaped one-way piston seals for low start-up pressure. Note this SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors. For load holding, explore the SAIL or BSAI lock variants.
Airtac SI40 Standard Cylinder SI40BX800 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX800 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX800 |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40BX800 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 SAI40BX800 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 SI40BX800
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40BX800 Is Used
Long-Stroke Diversion
Drives 800mm pusher arms on packaging lines to divert products into downstream lanes using the 628 N push force.
Stainless Rod Washdown
Actuates material handling gates in washdown zones where the SUS304 rod prevents corrosion and pitting.
Guided Vertical Lowering
Lowers 32 kg fixtures along external guides, using the 800mm travel to stack components precisely.
Replacing the Airtac SI40 Standard Cylinder SI40BX800 with the SAI40BX800
To replace the SI40BX800, order the SAI40BX800. Verify your ISO 15552 mounting fixtures, 40mm bore, 800mm stroke, G1/4 port, and SUS304 rod requirement. Because this 800mm stroke is long, use external guides to prevent rod bending and side-load damage. If sizing up or down, neighboring bores are 32mm (402 N push @0.5) and 50mm (982 N push @0.5). This non-magnetic SKU cannot take a sensor. For load holding without live air, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX800
- ✓ 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 SI40BX800 FAQ
Yes, the SI40BX800 is discontinued. The direct replacement is the SAI40BX800. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 800mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 port. It delivers 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX800
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX800 replacement — usually within 7-8 hours.