This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X100, 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 SI40X100
The AirTAC Airtac SI40 Standard Cylinder SI40X100 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 100mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X100, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke100 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X100
- 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 SI40X100
The AirTAC SI40X100 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 100mm stroke, delivering 628N push at 0.5MPa. The direct replacement is the SAI40X100, retaining the exact G1/4 port, M12x1.25 thread, and mounting interface.
This SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this base SI SKU lacks a magnet, so it cannot accept CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X100 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X100 |
| Bore size | Ø40 mm |
| Stroke | 100 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 SAI40X100 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 SAI40X100 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 SI40X100
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 SI40X100 Is Used
Small Part Ejection
Ideal for pushing lightweight machined components out of a fixture with 628N of force at 0.5MPa.
Package Diverting
Provides reliable 100mm stroke actuation to divert small cartons on a packaging line at speeds up to 800mm/s.
Clamp Actuation
Secures workpieces during light machining by applying a steady 528N pull force via the 16mm rod.
Replacing the Airtac SI40 Standard Cylinder SI40X100 with the SAI40X100
To replace the SI40X100, order the SAI40X100. Verify your ISO 15552 mounting hardware (LB, FA, TC, etc.), the G1/4 port, and the 100mm stroke. Because this specific SKU has no -S magnet, it cannot support position sensing; if you need switches, select an SAI40X100S and use current AirTAC sensors. If sizing up or down, a 32mm bore yields 402N push, while a 50mm bore yields 982N at 0.5MPa. For load holding on air loss, note that standard cushions only decelerate; you must add an external pilot check valve or choose the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X100
- ✓ 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 SI40X100 FAQ
Yes, the SI40X100 is discontinued. The direct replacement is the AirTAC SAI40X100. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 100mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder uses a G1/4 port and M12x1.25 rod thread. It delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa.
Request a Quote for the SAI40X100
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X100 replacement — usually within 7-8 hours.