This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X105, 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 SI40X105
The AirTAC Airtac SI40 Standard Cylinder SI40X105 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 SAI40X105, 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 → SAI40X105
- 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 SI40X105
The AirTAC SI40X105 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 105mm stroke, delivering 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X105, a direct replacement sharing the exact interface, bore, stroke, force, port and mounting.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S) and cannot accept a sensor; the legacy SI family used CS1-B/DS1-B switches.
Airtac SI40 Standard Cylinder SI40X105 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X105 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X105 |
| 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 SAI40X105 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 SAI40X105 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 SI40X105
| 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 SI40X105 Is Used
Clamp Actuation
Drives mid-force clamping arms for machining fixtures using its 628N push capacity at 0.5MPa.
Package Diversion
Extends 105mm to push light cartons off a belt line, fitting neatly within standard guard clearances.
Gate Control
Operates lightweight sorting gates where a 32kg vertical lift margin and compact profile barrel are ideal.
Replacing the Airtac SI40 Standard Cylinder SI40X105 with the SAI40X105
To replace the SI40X105, order the SAI40X105 and confirm the ISO 15552 mounting interface, 40mm bore, 105mm stroke, G1/4 port (PT/G/NPT thread options) and your mounting accessory. Because this SKU has no magnet, it cannot support position sensing. If you need to downsize, a 32mm bore yields 402N at 0.5MPa; if you need more force, a 50mm bore provides 982N. Remember a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X105
- ✓ 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 SI40X105 FAQ
Yes, the SI40X105 is discontinued. The direct replacement is the SAI40X105. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 105mm stroke, 628N force, G1/4 port and mounting fixtures.
The 40mm bore features a G1/4 port and M12x1.25 rod thread. It 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.
Request a Quote for the SAI40X105
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X105 replacement — usually within 7-8 hours.