This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX800SH, 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 SI40BX800SH
The AirTAC Airtac SI40 Standard Cylinder SI40BX800SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX800SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX800SH
- 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 SI40BX800SH
The AirTAC SI40BX800SH is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless steel rod and Viton H high-temperature seals (0-150 C). With a 40mm bore, it delivers 628 N push and 528 N pull at 0.5 MPa, operating at 30-800 mm/s through a G1/4 port. AirTAC replaced this legacy unit with the SAI40BX800SH, a direct upgrade retaining the exact ISO 15552 mounting interface, 800mm stroke, and M12x1.25 rod thread.
The SAI successor introduces an upgraded piston seal utilizing two Y-shaped one-way elements for lower start-up pressure and extended life. The original SI -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family expands capabilities with SAIL, SAIF, and BSAI lock variants.
Airtac SI40 Standard Cylinder SI40BX800SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX800SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX800SH |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAI40BX800SH 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 SAI40BX800SH 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 SI40BX800SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SI40BX800SH Is Used
High-Temp Diversion
Actuating routing gates on high-temperature conveyor lines using the Viton H seals and SUS304 rod for thermal and corrosion reliability.
Vertical Lift Gates
Lifting vertical access doors where the 800mm stroke provides full clearance and the 32 kg vertical lift margin handles the door mass.
Extended Transfer
Driving long-travel pallet transfer carriages, utilizing the adjustable 27mm air cushions to decelerate loads at stroke ends.
Replacing the Airtac SI40 Standard Cylinder SI40BX800SH with the SAI40BX800SH
To replace the discontinued SI40BX800SH, order the SAI40BX800SH. Verify your ISO 15552 mounting fixture, 40mm bore, 800mm stroke, G1/4 port, and M12x1.25 thread. The -B rod is SUS304 stainless and the -H seal is Viton for 0-150 C environments; the -S magnet works with legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). If you need more force, the neighboring 50mm bore provides 982 N push at 0.5 MPa; if less is required, the 32mm bore offers 402 N. Because this is an 800mm long stroke, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX800SH
- ✓ 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 SI40BX800SH FAQ
Yes, the SI40BX800SH is discontinued. The direct replacement is the SAI40BX800SH. It shares the identical ISO 15552 mounting interface, 40mm bore, 800mm stroke, output force, G1/4 port, and accessories, fitting existing fixtures perfectly while upgrading the piston seal.
The 40mm bore uses a G1/4 port. It generates 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 of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX800SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX800SH replacement — usually within 7-8 hours.