This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X135N, 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 SI40X135N
The AirTAC Airtac SI40 Standard Cylinder SI40X135N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 135mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X135N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X135N
- 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 SI40X135N
The AirTAC SI40X135N is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 135mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X135N, matching the exact bore, stroke, force, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This SKU lacks a magnet (-S) and cannot take a sensor, though legacy SI sensors were CS1-B/DS1-B. It uses an NBR (-N) seal for -20 to +70C; Viton H extends this to 150C.
Airtac SI40 Standard Cylinder SI40X135N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X135N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X135N |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAI40X135N 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 SAI40X135N 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 SI40X135N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SI40X135N Is Used
Clamp Actuation
Provides reliable 628N clamping force for mid-weight machining fixtures, utilizing the 135mm stroke to clear the workpiece fully.
Package Diversion
Drives sorting pop-gates on packaging lines where the 32kg vertical lift capacity easily handles product redirection tasks.
Replacing the Airtac SI40 Standard Cylinder SI40X135N with the SAI40X135N
To replace the SI40X135N, order the SAI40X135N, confirming the ISO 15552 interface, 40mm bore, 135mm stroke, G1/4 port (PT/G/NPT), and NBR seal. Because this specific SKU lacks the -S magnet, it cannot accept a position switch; if sensing is required, order the -S version. For sizing, the 32mm bore yields 402N push at 0.5MPa, while the 50mm bore yields 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 135mm stroke is under the 300mm threshold, so rod-bending side loads are minimal, but linear guides remain best practice.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X135N
- ✓ 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 SI40X135N FAQ
Yes, the SI40X135N is discontinued. The direct replacement is the SAI40X135N. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 135mm stroke, output force, G1/4 port, and mounting interface.
The 40mm bore features a G1/4 port. Force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X135N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X135N replacement — usually within 7-8 hours.