This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X15S, 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 SI40X15S
The AirTAC Airtac SI40 Standard Cylinder SI40X15S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 15mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X15S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke15 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X15S
- 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 SI40X15S
The AirTAC SI40X15S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 15mm stroke. Delivering 628N push force at 0.5MPa, it features a G1/4 port and an integrated magnet for position sensing. AirTAC replaced this legacy unit with the SAI40X15S, a direct upgrade sharing identical ISO 15552 mounting, bore, stroke, output force, and porting.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also expands functionality with SAIL lock, SAIF valve, and BSAI clamp-lock variants the original SI lacked.
Airtac SI40 Standard Cylinder SI40X15S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X15S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X15S |
| Bore size | Ø40 mm |
| Stroke | 15 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 SAI40X15S 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 SAI40X15S 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 SI40X15S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×15 | 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 SI40X15S Is Used
Short-Stroke Clamping
Ideal for holding lightweight workpieces in machining fixtures where a compact 15mm stroke and 628N force are sufficient.
Ejector Mechanisms
Provides rapid part ejection from automated presses, utilizing the 30-800mm/s speed range and integrated magnet for timing.
Gate Diverting
Actuates small pneumatic flaps or gates in material handling lines, fitting neatly into existing ISO 15552 mounting blocks.
Replacing the Airtac SI40 Standard Cylinder SI40X15S with the SAI40X15S
To replace the SI40X15S, order the SAI40X15S direct equivalent, verifying your ISO 15552 mounting interface, G1/4 port thread (PT/G/NPT), and the -S magnet requirement for legacy CS1-B/DS1-B sensors. If you need more force, the adjacent 50mm bore offers 982N push at 0.5MPa; if less is acceptable, the 32mm bore provides 402N. Note that a standard cylinder drifts on air loss since the cushion only decelerates at stroke end—for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X15S
- ✓ 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 SI40X15S FAQ
Yes, the SI40X15S is discontinued. The direct replacement is the SAI40X15S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 15mm stroke, 628N force, and G1/4 port to fit existing fixtures.
The 40mm bore features a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Request a Quote for the SAI40X15S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X15S replacement — usually within 7-8 hours.