This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX110, 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 SI40BX110
The AirTAC Airtac SI40 Standard Cylinder SI40BX110 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX110, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX110
- 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 SI40BX110
The AirTAC SI40BX110 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 110mm stroke, SUS304 stainless rod and G1/4 port. It delivers 628N push and 528N pull at 0.5MPa. Order the direct replacement SAI40BX110: identical ISO 15552 mounting, force and port.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This no-magnet SKU cannot take a sensor. For high heat, Viton H seals allow 0-150C.
Airtac SI40 Standard Cylinder SI40BX110 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX110 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX110 |
| Bore size | Ø40 mm |
| Stroke | 110 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 SAI40BX110 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 SAI40BX110 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 SI40BX110
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×110 | 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 SI40BX110 Is Used
Stainless Rod Diverter
Ideal for diverting items on a washdown conveyor line where the SUS304 rod resists corrosion and the 628N force handles packages reliably.
Film Sealing Press
Provides the precise 110mm travel and 528N pull force needed to cycle a packaging film sealing jaw without overstressing the mechanics.
Carton Stopper Gate
Acts as a stopping gate for medium weight cartons, using its 879N push force at 0.7MPa to halt items firmly on a gravity roller track.
Replacing the Airtac SI40 Standard Cylinder SI40BX110 with the SAI40BX110
To replace the SI40BX110, order the SAI40BX110. Confirm the ISO 15552 interface, 40mm bore, 110mm stroke, G1/4 port and SUS304 rod. This no-S SKU lacks a magnet and cannot accept a CS1-B/DS1-B switch. Sizing both ways: a 32mm bore yields 563N push @0.7MPa, while a 50mm bore yields 1374N @0.7MPa. The 110mm stroke avoids severe rod bending, but use a guide for side loads. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX110
- ✓ 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 SI40BX110 FAQ
Yes, the SI40BX110 is discontinued. The direct replacement is the SAI40BX110. It shares the exact same ISO 15552 mounting interface, 40mm bore, 110mm stroke, G1/4 port and output force, fitting existing fixtures perfectly.
It features a G1/4 air port and M12x1.25 rod thread. Force ratings are: 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 SAI40BX110
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX110 replacement — usually within 7-8 hours.