This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X170, 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 SI40X170
The AirTAC Airtac SI40 Standard Cylinder SI40X170 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 170mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X170, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke170 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X170
- 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 SI40X170
The AirTAC SI40X170 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 170 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40X170, matching the original bore, stroke, output, and mounting fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor.
Airtac SI40 Standard Cylinder SI40X170 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X170 |
| Bore size | Ø40 mm |
| Stroke | 170 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 SAI40X170 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 SAI40X170 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 SI40X170
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×170 | 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 SI40X170 Is Used
Component Clamping
Provides reliable 628 N hold-down force at 0.5 MPa for securing mid-sized aluminum or steel workpieces during CNC milling operations.
Package Diverting
Drives a 170 mm stroke diverting arm to push medium-weight cartons off a main production line onto a secondary packaging belt.
Pallet Stop Gate
Acts as an indexing stop gate for standard pallets entering a wrapping station, absorbing kinetic energy via its 27 mm adjustable air cushion.
Replacing the Airtac SI40 Standard Cylinder SI40X170 with the SAI40X170
To replace the SI40X170, order the SAI40X170. Verify the ISO 15552 mounting interface, 170 mm stroke, G1/4 port (PT/G/NPT thread), and accessories like FA flange or LB foot. Sizing both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates. Use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Since the stroke is under 300 mm, severe rod-bending side loads are less critical, but proper guide alignment is still advised.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X170
- ✓ 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 SI40X170 FAQ
Yes, the AirTAC SI40X170 is discontinued. The direct replacement is the SAI40X170. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 170 mm stroke, force, G1/4 port, and mounting interface.
It features a G1/4 air port and delivers 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. The 16 mm rod uses an M12x1.25 thread.
Request a Quote for the SAI40X170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X170 replacement — usually within 7-8 hours.