This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX75S, 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 SI40BX75S
The AirTAC Airtac SI40 Standard Cylinder SI40BX75S 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 SAI40BX75S, 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 → SAI40BX75S
- 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 SI40BX75S
The AirTAC SI40BX75S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 75mm stroke, and SUS304 stainless steel rod. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40BX75S, a direct sharing identical ISO 15552 mounting, bore, and stroke. The SAI upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life.
This -S variant includes a piston magnet for CS1-B/DS1-B switches. Note that standard cylinders drift without live air; for held loads consider the SAIL lock or BSAI clamp-lock variants the SI line lacked.
Airtac SI40 Standard Cylinder SI40BX75S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX75S |
| 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 SAI40BX75S 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 SAI40BX75S 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 SI40BX75S
| 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 SI40BX75S Is Used
Stainless Rod Clamping
Ideal for packaging machines needing corrosion resistance, using the SUS304 rod to clamp parts with a safe 377N working load.
Short-Stroke Diversion
Provides reliable 75mm actuation to divert light packages on conveyors, operating smoothly at 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40BX75S with the SAI40BX75S
To replace the SI40BX75S, order the SAI40BX75S. Confirm the ISO 15552 interface, 75mm stroke, G1/4 port, and SUS304 rod (-B). The -S magnet enables current AirTAC switches. If downsizing, a 32mm bore yields 402N at 0.5MPa; if upsizing, a 50mm bore gives 982N. Because stroke is under 300mm, side-load risks are minimal. Remember, cushions only decelerate; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX75S
- ✓ 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 SI40BX75S FAQ
Yes, the SI40BX75S is discontinued. The direct replacement is the SAI40BX75S. It shares the same ISO 15552 mounting interface, 40mm bore, 75mm stroke, G1/4 port, and SUS304 rod, but features an upgraded two Y-shaped element piston seal.
The 40mm bore features 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 theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX75S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX75S replacement — usually within 7-8 hours.