This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX135S, 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 SI40AX135S
The AirTAC Airtac SI40 Standard Cylinder SI40AX135S 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 SAI40AX135S, 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 → SAI40AX135S
- 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 SI40AX135S
The AirTAC SI40AX135S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 135mm stroke. It delivers 628N push force at 0.5MPa and features a SUS420J2 stainless piston rod for corrosion resistance. The direct replacement is the current-production SAI40AX135S, which shares the exact same G1/4 port, M12x1.25 thread, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade introduces an improved piston seal utilizing two Y-shaped one-way elements for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, and Viton H seal options extend operating temperatures up to 150C.
Airtac SI40 Standard Cylinder SI40AX135S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX135S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX135S |
| 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 SAI40AX135S 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 SAI40AX135S 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 SI40AX135S
| 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 SI40AX135S Is Used
Stainless Rod Clamping
Ideal for moderate-duty clamping tasks where the SUS420J2 rod resists moisture and the 628N force securely holds workpieces during machining.
Package Diverting
Provides reliable 135mm stroke actuation for diverting small to medium packages on production lines, operating efficiently at 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40AX135S with the SAI40AX135S
To replace the SI40AX135S, order the SAI40AX135S and verify your ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread. The 135mm stroke is a standard size, so no custom machining is needed. Because this stroke is under 300mm, rod-bending side loads are minimal, but always guide the load to prevent binding. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore provides 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for held loads. The SAIF variant adds a built-in 4M valve if you need integrated control.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX135S
- ✓ 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 SI40AX135S FAQ
Yes, the AirTAC SI40AX135S is discontinued. The direct replacement is the SAI40AX135S. It is a true ISO 15552 profile cylinder that matches the original 40mm bore, 135mm stroke, 628N force, G1/4 port, and mounting dimensions, fitting directly into existing fixtures.
The 40mm bore operates at 0.15-1.0 MPa with a G1/4 air port. Force output is 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa. It features a 16mm rod and 27mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX135S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX135S replacement — usually within 7-8 hours.