This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X122, 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 SI40X122
The AirTAC SI40 Standard Cylinder SI40X122 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 122mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X122, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke122 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X122
- 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 SI40X122
The AirTAC SI40X122 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 122mm stroke. It delivers 628N push and 528N pull at 0.5MPa. The direct replacement is the SAI40X122, matching the G1/4 port, M12x1.25 thread, and 27mm cushion. This non-magnetic SKU lacks a sensor groove switch and cannot take position sensing.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X122 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X122 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X122 |
| Bore size | Ø40 mm |
| Stroke | 122 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 SAI40X122 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 SAI40X122 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 SI40X122
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×122 | 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 SI40X122 Is Used
Small Part Ejection
Uses the 628N push force at 0.5MPa to reliably eject small machined components from a fixture without damaging the surface.
Package Diverting
The 122mm stroke actuates a diverter arm at 30-800mm/s to push lightweight cartons off a main conveyor belt line.
Replacing the Airtac SI40 Standard Cylinder SI40X122 with the SAI40X122
To replace this SI40X122, order the SAI40X122. Confirm the ISO 15552 mounting interface, 122mm stroke, G1/4 port, and 27mm cushion. This SKU has no magnet, so it cannot accept a CS1-B/DS1-B sensor; order an -S version if sensing is needed. For sizing, a 32mm bore yields 402N push, while a 50mm bore provides 982N at 0.5MPa. A plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 122mm stroke, rod bending is negligible, but for strokes over 300mm, add a guide to prevent side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X122
- ✓ 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 SI40X122 FAQ
Yes, the SI40X122 is discontinued. The direct replacement is the SAI40X122. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 40mm bore, 122mm stroke, 628N force, G1/4 port, and mounting accessories.
The SI40X122 features a G1/4 air port and M12x1.25 rod thread. It generates 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 SAI40X122
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X122 replacement — usually within 7-8 hours.