This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X115, 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 SI40X115
The AirTAC Airtac SI40 Standard Cylinder SI40X115 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 115mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X115, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X115
- 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 SI40X115
The AirTAC SI40X115 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 115 mm stroke, delivering 628 N push force at 0.5 MPa. It has been superseded by the SAI40X115 direct replacement, which retains the exact same G1/4 port, M12x1.25 rod thread, and ISO 15552 mounting interface to fit existing fixtures perfectly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet and cannot take a sensor, unlike legacy CS1-B/DS1-B switches. Rod materials include carbon steel, SUS420J2, or SUS304.
Airtac SI40 Standard Cylinder SI40X115 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X115 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X115 |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAI40X115 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 SAI40X115 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 SI40X115
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SI40X115 Is Used
Package Diverting
Pushes light to medium cartons off a main conveyor line utilizing the 628 N push force at 0.5 MPa, with the 115 mm stroke providing ample travel for sorting lanes.
Clamp Actuation
Secures workpieces in light machining or assembly fixtures, where the 528 N pull force at 0.5 MPa reliably holds parts without deflecting the 16 mm carbon steel rod.
Gate Operation
Opens and closes gravity feed gates in material silos, taking advantage of the adjustable 27 mm air cushions at both ends to prevent slamming at speeds up to 800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X115 with the SAI40X115
To replace the SI40X115, order the SAI40X115. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT, G, or NPT), and note this non-magnetic SKU cannot support position sensing. For higher force, the 50 mm bore yields 982 N push at 0.5 MPa; for lower force, the 32 mm bore yields 402 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for load holding, or specify the SAIL or BSAI lock variants. At 115 mm stroke, side-load risks are minimal, but ensure adequate guide support.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X115
- ✓ 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 SI40X115 FAQ
Yes, the SI40X115 is discontinued. The direct replacement is the AirTAC SAI40X115. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 115 mm stroke, G1/4 port, and mounting interface, so it drops directly into existing machinery.
At 0.5 MPa it provides 628 N push and 528 N pull force, increasing to 879 N push at 0.7 MPa and 1130 N push at 0.9 MPa, with a theoretical max of 128 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a G1/4 air port.
Request a Quote for the SAI40X115
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X115 replacement — usually within 7-8 hours.