This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX145, 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 SI40BX145
The AirTAC Airtac SI40 Standard Cylinder SI40BX145 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX145, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX145
- 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 SI40BX145
The AirTAC SI40BX145 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 145mm stroke. It features a SUS304 stainless piston rod for corrosion resistance and delivers 628N push force at 0.5MPa via its G1/4 port. AirTAC replaced this EOL unit with the SAI40BX145, a direct sharing the exact interface, cushioning and output force.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. For sensing, note this specific SKU lacks a magnet and cannot take a switch. For load holding, the cushion only decelerates; explore the SAIL lock or BSAI clamp-lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40BX145 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX145 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX145 |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAI40BX145 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 SAI40BX145 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 SI40BX145
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SI40BX145 Is Used
Stainless Rod Clamping
Ideal for packaging machinery where the SUS304 rod resists washdowns while providing 628N of clamping thrust at 0.5 MPa.
Replacing the Airtac SI40 Standard Cylinder SI40BX145 with the SAI40BX145
To replace the SI40BX145, order the SAI40BX145. Verify the ISO 15552 mounting dimensions, 145mm stroke, G1/4 port, and your specific mounting accessory. Because this SKU has no -S magnet, it cannot accept a CS1-B/DS1-B sensor; if position detection is needed, select a magnet-equipped SAI. Sizing checks: the 40mm bore yields 628N push at 0.5MPa (879N at 0.7MPa), while a neighbouring 32mm bore provides 402N. A plain cylinder drifts on air loss, so for suspended loads use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX145
- ✓ 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 SI40BX145 FAQ
Yes, the SI40BX145 is discontinued. The direct replacement is the SAI40BX145. It shares the identical ISO 15552 mounting interface, 40mm bore, 145mm stroke, G1/4 port, and output force, fitting existing fixtures perfectly.
This 40mm bore cylinder has a G1/4 air port and M12x1.25 rod thread. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX145
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX145 replacement — usually within 7-8 hours.