This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX1000, 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 SI40BX1000
The AirTAC Airtac SI40 Standard Cylinder SI40BX1000 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX1000, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX1000
- 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 SI40BX1000
The AirTAC SI40BX1000 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 1000mm stroke, and a SUS304 stainless steel rod. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40BX1000, retaining identical ISO 15552 mounting dimensions, output, and accessories.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet and cannot take a sensor; use CS1-B/DS1-B switches only on magnetized versions. For high heat, Viton H seals raise the temperature range to 0-150C.
Airtac SI40 Standard Cylinder SI40BX1000 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX1000 |
| Bore size | Ø40 mm |
| Stroke | 1000 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 SAI40BX1000 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 SAI40BX1000 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 SI40BX1000
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1000 | 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 SI40BX1000 Is Used
Long-Stroke Diversion
Drives 1000mm pusher arms on conveyor lines to sort packages, utilizing the 628N force at 0.5MPa to shift products reliably.
Stainless Material Handling
Actuates lifting gates or dampers in humid washdown environments, leveraging the SUS304 rod for corrosion resistance over the long travel.
Equipment Ejection
Ejects machined parts from automated fixtures over a 1-meter distance, requiring external guides to prevent rod bending at full extension.
Replacing the Airtac SI40 Standard Cylinder SI40BX1000 with the SAI40BX1000
To replace the SI40BX1000, order the SAI40BX1000 and confirm the ISO 15552 mounting interface, 1000mm stroke, G1/4 port, and SUS304 rod. Because this lacks the -S suffix, it cannot accept a magnetic switch. If sizing up or down, the 32mm bore offers 402N push at 0.5MPa, while the 50mm bore provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Finally, at 1000mm stroke, prevent rod bending by guiding the load externally to avoid side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX1000
- ✓ 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 SI40BX1000 FAQ
Yes, the SI40BX1000 is discontinued. The direct replacement is the SAI40BX1000. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 1000mm stroke, G1/4 port, and mounting hardware.
The G1/4 port feeds a 40mm bore yielding 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. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX1000 replacement — usually within 7-8 hours.