This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX500SH, 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 SI40BX500SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX500SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX500SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX500SH
- 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 SI40BX500SH
The AirTAC SI40BX500SH is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 500 mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa, features a G1/4 port, and includes a SUS304 stainless rod (-B) and Viton H seal (-H) for 0-150 C heat. AirTAC replaced it with the SAI40BX500SH direct.
The SAI successor shares identical ISO 15552 mounting, bore, stroke, force, and port sizes. It upgrades the piston seal to two Y-shaped elements for lower start-up pressure and longer life.
Airtac SI40 Standard Cylinder SI40BX500SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX500SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX500SH |
| Bore size | Ø40 mm |
| Stroke | 500 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 SAI40BX500SH 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 SAI40BX500SH 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 SI40BX500SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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 SI40BX500SH Is Used
Hot End Diversion
Rejects or diverts parts on a high-temperature conveyor using the Viton H seal and SUS304 rod to withstand ambient heat near ovens.
Elevated Gate Actuation
Cycles a 500 mm stroke discharge gate on a bulk hopper, where the long travel and 628 N push force reliably clear jammed material.
Corrosive Fluid Transfer
Drives a diverter valve in a washdown chemical station, leveraging the SUS304 piston rod to resist rust and chemical exposure.
Replacing the Airtac SI40 Standard Cylinder SI40BX500SH with the SAI40BX500SH
To replace this SI40BX500SH, order the SAI40BX500SH. Verify the ISO 15552 interface, 40 mm bore, 500 mm stroke, G1/4 port, and your mounting accessory. The -S magnet works with legacy CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while -B gives a SUS304 rod and -H provides Viton H high-temp seals. For sizing, neighbouring bores are 32 mm (402 N push) and 50 mm (982 N push). At 500 mm stroke, use external guides to prevent rod bending and side-load wear. This plain cylinder does not hold load without live air; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX500SH
- ✓ 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 SI40BX500SH FAQ
Yes, the SI40BX500SH is discontinued. The direct replacement is the SAI40BX500SH. It shares the same ISO 15552 mounting interface, 40 mm bore, 500 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
This double-acting cylinder has a G1/4 air port. It provides 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 SAI40BX500SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX500SH replacement — usually within 7-8 hours.