This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX75, 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 SI40BX75
The AirTAC Airtac SI40 Standard Cylinder SI40BX75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX75
- 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 SI40BX75
The AirTAC SI40BX75 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 75mm stroke. It delivers 628N push and 528N pull at 0.5MPa via a G1/4 port. The direct replacement is the SAI40BX75, matching the bore, stroke, force, port and ISO 15552 mounting interface exactly.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -B rod is SUS304 stainless steel for corrosion resistance. As a non-magnet SKU, it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40BX75 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX75 |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAI40BX75 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 SAI40BX75 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 SI40BX75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SI40BX75 Is Used
Compact Clamping
Applies 528N pull force at 0.5MPa to secure mid-sized machined parts during milling or drilling operations.
Package Diverting
Extends 75mm to push moderate-weight cartons off a main conveyor belt line into secondary packaging chutes.
Stopper Gate
Acts as a pneumatic stop gate for workpiece pallets, utilizing the SUS304 rod option for humid washdown areas.
Replacing the Airtac SI40 Standard Cylinder SI40BX75 with the SAI40BX75
To replace the SI40BX75, order the SAI40BX75. Confirm the ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port (PT/G/NPT thread) and your specific mounting accessory. Because this SKU lacks a magnet (-S), it cannot accept a CS1-B/DS1-B sensor; if position detection is needed, select an SAI40X75S equivalent. Sizing both ways: a 50mm bore offers 982N push at 0.5MPa, while dropping to 32mm yields 402N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX75
- ✓ 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 SI40BX75 FAQ
Yes, the SI40BX75 is discontinued. The direct replacement is the SAI40BX75. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 75mm stroke, G1/4 port and mounting interface.
It has a G1/4 port. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. Speed is 30-800mm/s.
Request a Quote for the SAI40BX75
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX75 replacement — usually within 7-8 hours.