This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX40, 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 SI40BX40
The AirTAC SI40 Standard Cylinder SI40BX40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX40
- 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 SI40BX40
The AirTAC SI40BX40 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 40mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40BX40. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force and port.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -B variant uses a SUS304 stainless piston rod for corrosion resistance. As a no-S SKU, it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40BX40 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX40 |
| Bore size | Ø40 mm |
| Stroke | 40 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 SAI40BX40 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 SAI40BX40 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 SI40BX40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SI40BX40 Is Used
Short-Stroke Clamping
Ideal for holding light metal or plastic components during machining, using its 628N push force to secure parts firmly without deformation.
Package Diverting
Provides rapid 40mm actuation to push small cartons off a production line, operating reliably at speeds between 30-800 mm/s.
Compact Ejection
Suited for ejecting molded parts from tight spaces where the 16mm rod and compact 40mm stroke deliver precise, repeatable ejection.
Replacing the Airtac SI40 Standard Cylinder SI40BX40 with the SAI40BX40
To replace the SI40BX40, order the SAI40BX40. Verify the ISO 15552 mounting interface, 40mm stroke, G1/4 port (PT/G/NPT) and mounting accessory. This SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B switches. If sensing is needed, switch to an SAI40X40S. For sizing, the 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX40
- ✓ 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 SI40BX40 FAQ
Yes, the SI40BX40 is discontinued. The direct replacement is the SAI40BX40. It shares the same ISO 15552 mounting interface, 40mm bore, 40mm stroke, 628N force, G1/4 port and mounting accessories, fitting existing fixtures perfectly.
The G1/4 port feeds a 40mm bore generating 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a max force of 128kgf at 1.0MPa. It features a 16mm SUS304 rod, M12x1.25 thread, and 27mm cushions.
Request a Quote for the SAI40BX40
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX40 replacement — usually within 7-8 hours.