This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX165, 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 SI40AX165
The AirTAC Airtac SI40 Standard Cylinder SI40AX165 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 165mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX165, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX165
- 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 SI40AX165
The AirTAC SI40AX165 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 165mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX165, a direct upgrade retaining the exact interface, force, and mounting.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific SKU uses a SUS420J2 stainless rod (-A) and lacks a magnet, meaning it cannot accept CS1-B/DS1-B sensors. For load holding, note that air cushions only decelerate; explore SAIL or BSAI lock variants.
Airtac SI40 Standard Cylinder SI40AX165 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX165 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX165 |
| Bore size | Ø40 mm |
| Stroke | 165 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 SAI40AX165 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 SAI40AX165 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 SI40AX165
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×165 | 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 SI40AX165 Is Used
Mid-Tonnage Clamping
Secures workpieces in CNC machining fixtures, utilizing the 628N push force and SUS420J2 stainless rod to resist corrosion in wet cutting environments.
Package Diverting
Actuates routing gates on 165mm strokes to redirect mid-weight cartons along material handling lines without requiring magnetic position feedback.
Pallet Stopper Arms
Deploys mechanical stops to halt pallets at workstations, relying on adjustable air cushions to decelerate the 32kg vertical load capacity smoothly.
Replacing the Airtac SI40 Standard Cylinder SI40AX165 with the SAI40AX165
To replace the SI40AX165, order the SAI40AX165. Verify the ISO 15552 mounting interface, 40mm bore, 165mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. Because this is a no-S SKU, it cannot support magnetic sensing; if position detection is required, switch to an -S variant. For sizing, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Remember, a plain cylinder drifts on air loss—cushions only decelerate. For secure holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant integrates a 4M valve if self-actuation is needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX165
- ✓ 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 SI40AX165 FAQ
Yes, the AirTAC SI40AX165 is discontinued. The direct replacement is the SAI40AX165. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 165mm stroke, output force, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 air port. It generates 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. The rod end thread is M12x1.25.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX165
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX165 replacement — usually within 7-8 hours.