This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150N, 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 SI40X150N
The AirTAC Airtac SI40 Standard Cylinder SI40X150N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X150N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X150N
- 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 SI40X150N
The AirTAC SI40X150N is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 150mm stroke. It delivers 628N push and 528N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X150N, which matches the exact interface, force, and mounting. This NBR-sealed (-N) unit operates from -20 to +70C; a Viton H option extends this to 150C.
Because this SKU lacks the -S magnet, it cannot accept position switches like the legacy CS1-B/DS1-B. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life.
Airtac SI40 Standard Cylinder SI40X150N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150N |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40X150N 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 SAI40X150N 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 SI40X150N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40X150N Is Used
Package Diversion
Actuates routing gates on packaging lines using the 628N push force at 0.5MPa to deflect cartons reliably.
Clamp Actuation
Provides 150mm travel to close medium-duty machining clamps, safely holding workpieces with a 377N working load.
Replacing the Airtac SI40 Standard Cylinder SI40X150N with the SAI40X150N
To replace the SI40X150N, order the SAI40X150N and verify your ISO 15552 mounting interface, 150mm stroke, and G1/4 port. Confirm your mounting accessory (LB, FA, TC, etc.) and note that this non-magnetic SKU cannot hold a sensor. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. At 150mm stroke, ensure guide alignment to prevent rod-bending side loads. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150N
- ✓ 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 SI40X150N FAQ
Yes, the SI40X150N is discontinued. The direct replacement is the SAI40X150N. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 150mm stroke, 628N force, G1/4 port, and mounting fixtures.
It features a G1/4 air port and provides 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. The piston rod is 16mm with an M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X150N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150N replacement — usually within 7-8 hours.