This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40BX260, 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 SI40BX260
The AirTAC Airtac SI40 Standard Cylinder SI40BX260 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 260mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40BX260, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40BX260
- 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 SI40BX260
The AirTAC SI40BX260 is a discontinued double-acting ISO 15552 profile cylinder featuring a SUS304 stainless piston rod and a 260 mm stroke. Delivering 628 N push force at 0.5 MPa, it is directly replaced by the SAI40BX260. This direct upgrade shares the exact G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface.
The SAI replacement features an upgraded piston seal with two Y-shaped elements for low start-up pressure and long life. Because this SKU lacks a magnet, it cannot accept a sensor.
Airtac SI40 Standard Cylinder SI40BX260 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40BX260 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40BX260 |
| Bore size | Ø40 mm |
| Stroke | 260 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 SAI40BX260 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 SAI40BX260 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 SI40BX260
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×260 | 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 SI40BX260 Is Used
Washdown Sorting
Uses the SUS304 rod to resist moisture while pushing 628 N at 0.5 MPa to divert packages on a washdown conveyor line.
Clamp Actuation
Provides a 260 mm stroke to reach and clamp mid-size aluminum housings inside CNC machining centers.
Carton Lid Flaps
Extends fully to fold packing carton flaps, relying on adjustable air cushions to decelerate before the end of travel.
Replacing the Airtac SI40 Standard Cylinder SI40BX260 with the SAI40BX260
To replace the SI40BX260, order the SAI40BX260. Confirm the ISO 15552 mounting interface, G1/4 port, and 260 mm stroke. This non-magnet SKU cannot take a switch; order an SAI variant with S if sensing is needed. The SUS304 rod suits corrosive settings. At 0.5 MPa it yields 628 N push; neighbouring bores offer 402 N (32) or 982 N (50). For 260 mm strokes, use guide rails to prevent rod bending. The cushion only decelerates; use SAIL or a check valve for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40BX260
- ✓ 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 SI40BX260 FAQ
Yes, the SI40BX260 is discontinued. The direct replacement is the SAI40BX260, which shares the same ISO 15552 mounting interface, 40 mm bore, 260 mm stroke, force, and G1/4 port.
It features a G1/4 port and provides 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 SAI40BX260
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40BX260 replacement — usually within 7-8 hours.