This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX1000S, 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 SI40BX1000S
The AirTAC SI40 Standard Cylinder SI40BX1000S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX1000S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX1000S
- 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 SI40BX1000S
The AirTAC SI40BX1000S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore, 1000mm stroke, and a SUS304 stainless steel rod. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40BX1000S, matching the bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40BX1000S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX1000S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX1000S |
| Bore size | Ø40 mm |
| Stroke | 1000 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 SAI40BX1000S 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 SAI40BX1000S 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 SI40BX1000S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1000 | 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 SI40BX1000S Is Used
Long-Stroke Diversion
Drives 1000mm routing gates on washdown conveyor lines, utilizing the SUS304 rod for corrosion resistance against splashing and cleaning chemicals.
Pneumatic Positioning
Shifts tooling carriages 1 meter forward and back, relying on the adjustable 27mm air cushions to decelerate the load at stroke ends.
Replacing the Airtac SI40 Standard Cylinder SI40BX1000S with the SAI40BX1000S
To replace the SI40BX1000S, order the SAI40BX1000S, confirming the ISO 15552 mounting interface, 40mm bore, 1000mm stroke, G1/4 port, and mounting accessories. The -B suffix specifies the SUS304 stainless rod, and the -S indicates the piston magnet for CS1-B/DS1-B switches. If sizing up, a 50mm bore offers 982 N push at 0.5 MPa; if downsizing, a 32mm bore provides 402 N. Note that a 1000mm stroke requires external guides to prevent rod bending and side-load damage. A plain cylinder drifts without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX1000S
- ✓ 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 SI40BX1000S FAQ
Yes, the SI40BX1000S is discontinued. The direct replacement is the AirTAC SAI40BX1000S. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 1000mm stroke, G1/4 port, and SUS304 stainless rod.
The bore is 40mm with a G1/4 air port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa it pushes 879 N, and 1130 N at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40BX1000S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX1000S replacement — usually within 7-8 hours.