This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX105S, 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 SI40AX105S
The AirTAC Airtac SI40 Standard Cylinder SI40AX105S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 105mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX105S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX105S
- 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 SI40AX105S
The AirTAC SI40AX105S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 105mm stroke. Featuring a SUS420J2 stainless steel rod and a built-in magnet for CS1-B/DS1-B switches, it delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40AX105S, retaining the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For applications needing load holding, the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40AX105S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX105S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX105S |
| Bore size | Ø40 mm |
| Stroke | 105 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 SAI40AX105S 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 SAI40AX105S 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 SI40AX105S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×105 | 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 SI40AX105S Is Used
Stainless Rod Clamping
Ideal for securing workpieces on machining lines where the SUS420J2 rod resists corrosion and the 628N force provides firm, stable holding.
Package Diverting
Deploys a 105mm stroke to push cartons on packaging conveyors, with the built-in magnet confirming position via CS1-B/DS1-B switches.
Light Lift Gates
Handles vertical lifting of light material gates up to 32kg, benefiting from the smooth adjustable air cushions at both stroke ends.
Replacing the Airtac SI40 Standard Cylinder SI40AX105S with the SAI40AX105S
To replace the SI40AX105S, order the SAI40AX105S. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 105mm stroke, G1/4 port, M12x1.25 rod thread and 27mm cushions. The -S magnet and -A SUS420J2 stainless rod carry over directly. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant integrates a 4M valve for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX105S
- ✓ 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 SI40AX105S FAQ
Yes, the SI40AX105S is discontinued. The direct replacement is the SAI40AX105S. It shares the same ISO 15552 mounting interface, 40mm bore, 105mm stroke, force, G1/4 port and accessories, fitting directly into existing fixtures.
The G1/4 port bore delivers 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. Operating pressure is 0.15-1.0MPa, with a speed range of 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40AX105S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX105S replacement — usually within 7-8 hours.