This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX50SH, 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 SI40BX50SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX50SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX50SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX50SH
- 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 SI40BX50SH
The AirTAC SI40BX50SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 50mm stroke. Featuring a SUS304 stainless piston rod and Viton H high-temperature seals (0-150 C), it delivers 628 N push at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40BX50SH.
The SAI40BX50SH is a direct replacement retaining the exact ISO 15552 mounting interface, bore, and force. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. The original -S magnet supports legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX50SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX50SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX50SH |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAI40BX50SH 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 SAI40BX50SH 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 SI40BX50SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SI40BX50SH Is Used
Hot End Ejection
Ideal for pushing parts in high-temperature environments up to 150 C using the Viton H seal and SUS304 rod.
Diverting Arms
Provides 628 N of thrust at 0.5 MPa to actuate routing gates on packaging lines with a short 50mm stroke.
Corrosive Sorting
The SUS304 stainless rod excels in humid or wash-down logistics facilities requiring reliable 32 kg vertical lifting.
Replacing the Airtac SI40 Standard Cylinder SI40BX50SH with the SAI40BX50SH
To replace the SI40BX50SH, order the SAI40BX50SH. Confirm the ISO 15552 mounting fixture, 50mm stroke, G1/4 port, and the -S magnet for current AirTAC switches. If you need more force, the neighbouring 50mm bore yields 982 N push at 0.5 MPa; if less is required, the 32mm bore provides 402 N. Remember this plain cylinder will not hold a load on air loss—the cushion only decelerates. For secure holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX50SH
- ✓ 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 SI40BX50SH FAQ
Yes, the SI40BX50SH is discontinued. The direct replacement is the SAI40BX50SH, which shares the identical ISO 15552 mounting interface, 40mm bore, 50mm stroke, force, and G1/4 port.
It features a G1/4 port and delivers 628 N push / 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX50SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX50SH replacement — usually within 7-8 hours.