This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX105, 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 SI40BX105
The AirTAC Airtac SI40 Standard Cylinder SI40BX105 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX105, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX105
- 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 SI40BX105
The AirTAC SI40BX105 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 105mm stroke, SUS304 stainless steel rod and G1/4 port. It delivers 628N push and 528N pull at 0.5MPa. AirTAC replaced this legacy unit with the SAI40BX105, a direct replacement sharing the exact ISO 15552 mounting interface, output force and dimensions. The SAI upgrade features a modernized piston seal using two Y-shaped one-way elements for lower start-up pressure and extended service life.
Because this SKU lacks the -S magnet suffix, it cannot accept a CS1-B or DS1-B sensor. The -B rod option provides SUS304 stainless steel for corrosion resistance instead of the standard carbon steel. Note that a plain cylinder drifts on air loss; for load holding, consider the SAIL or BSAI lock variants.
Airtac SI40 Standard Cylinder SI40BX105 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX105 |
| Bore size | Ø40 mm |
| Stroke | 105 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 SAI40BX105 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 SAI40BX105 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 SI40BX105
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×105 | 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 SI40BX105 Is Used
Stainless Rod Clamping
Ideal for packaging lines where the SUS304 rod resists washdown moisture while providing 628N of clamping thrust at 0.5MPa.
Mid-Stroke Diversion
The 105mm stroke offers precise travel for diverting lightweight goods on a conveyor without overextending the footprint.
Replacing the Airtac SI40 Standard Cylinder SI40BX105 with the SAI40BX105
To replace the discontinued SI40BX105, order the SAI40BX105. Verify your ISO 15552 mounting fixture, the 105mm stroke, and the G1/4 port. This unit has a -B SUS304 stainless piston rod and no magnet (-S), meaning it cannot support legacy CS1-B/DS1-B switches. If you need position sensing, select an SAI40X105S instead. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore offers 982N. Remember that a standard cylinder does not hold load without live air—the cushion only decelerates. For secure holding, use an external pilot check valve or explore the SAIL air-released lock and BSAI clamp-lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX105
- ✓ 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 SI40BX105 FAQ
Yes, the SI40BX105 is discontinued. The direct replacement is the SAI40BX105. It shares the same ISO 15552 mounting interface, 40mm bore, 105mm stroke, G1/4 port and output force, but features an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
The 40mm bore features a G1/4 air port and a 16mm piston rod. It generates 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum force of 128kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX105 replacement — usually within 7-8 hours.