This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX450SH, 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 SI40BX450SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX450SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX450SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX450SH
- 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 SI40BX450SH
The AirTAC SI40BX450SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 450mm stroke. Built for a 628N push force at 0.5MPa, it features a SUS304 stainless steel rod, a Viton H high-temperature seal (0-150C), and a G1/4 port. AirTAC replaced this EOL unit with the SAI40BX450SH, a direct alternative retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and porting.
The SAI successor introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family expands functionality with SAIL, SAIF, and BSAI lock or valve variants the SI line lacked.
Airtac SI40 Standard Cylinder SI40BX450SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX450SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX450SH |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAI40BX450SH 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 SAI40BX450SH 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 SI40BX450SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SI40BX450SH Is Used
High-Temp Diverting
Actuating diverters on warm material conveyors using the Viton H seal rated for 0-150C and a SUS304 rod for washdown resistance.
Extended Reach Sorting
Driving long-travel sorting arms where the 450mm extension requires external guides to mitigate rod bending and side-load wear.
Replacing the Airtac SI40 Standard Cylinder SI40BX450SH with the SAI40BX450SH
To replace the SI40BX450SH, order the SAI40BX450SH direct cylinder, verifying the ISO 15552 mounting interface, 40mm bore, 450mm stroke, G1/4 port, and your specific mounting accessory. Retain the -S magnet for position sensing (legacy CS1-B/DS1-B switches) and the -B SUS304 rod for corrosion resistance. Because this is a 450mm stroke, use an external guide to prevent rod bending and side-load damage. For sizing alternatives, the neighboring 32mm bore yields 402N push at 0.5MPa, while the 50mm bore provides 982N. Note that a standard cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX450SH
- ✓ 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 SI40BX450SH FAQ
Yes, the SI40BX450SH is discontinued. The direct replacement is the SAI40BX450SH. It shares the same ISO 15552 mounting interface, 40mm bore, 450mm stroke, output force, and G1/4 port, fitting existing fixtures directly.
This double-acting cylinder has a G1/4 port and provides 628N push / 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. It features a 16mm rod and 27mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX450SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX450SH replacement — usually within 7-8 hours.