This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX140S, 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 SI40BX140S
The AirTAC Airtac SI40 Standard Cylinder SI40BX140S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 140mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX140S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX140S
- 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 SI40BX140S
The AirTAC SI40BX140S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 140mm stroke, and a SUS304 stainless steel rod. It delivers 628 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40BX140S, a direct sharing the same ISO 15552 mounting interface, bore, stroke, output force, G1/4 port, and accessories.
The SAI upgrade utilizes an advanced two Y-shaped one-way piston seal for low start-up pressure and extended life. Because of the -S magnet, this cylinder supports legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX140S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX140S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX140S |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAI40BX140S 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 SAI40BX140S 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 SI40BX140S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SI40BX140S Is Used
Stainless Rod Diverter
Ideal for pushing lightweight packages on a washdown conveyor line utilizing the SUS304 rod for corrosion resistance.
Pneumatic Package Gate
Actuates routing gates for medium-weight logistics parcels requiring a 628 N push force at 0.5 MPa operating pressure.
Assembly Line Ejector
Ejects small finished parts from machining centers with a 140mm stroke and 30-800 mm/s adjustable speed range.
Replacing the Airtac SI40 Standard Cylinder SI40BX140S with the SAI40BX140S
To replace the SI40BX140S, order the SAI40BX140S. Verify your ISO 15552 mounting interface, 140mm stroke, G1/4 port, and mounting accessory (LB, FA, TC, etc.). The -B rod is SUS304 stainless steel, and the -S magnet works with legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If you need more force, the 50mm bore offers 982 N push at 0.5 MPa; if less is required, the 32mm bore provides 402 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX140S
- ✓ 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 SI40BX140S FAQ
Yes, the SI40BX140S is discontinued. The direct replacement is the SAI40BX140S. It shares the exact same ISO 15552 mounting interface dimensions, 40mm bore, 140mm stroke, output force, and G1/4 port, fitting directly into existing fixtures.
This double-acting cylinder features a G1/4 air port. The thrust ratings are: 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX140S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX140S replacement — usually within 7-8 hours.