This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X215SN, 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 SI40X215SN
The AirTAC Airtac SI40 Standard Cylinder SI40X215SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 215mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X215SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke215 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X215SN
- 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 SI40X215SN
The AirTAC SI40X215SN is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 215mm stroke. It delivers 628N push force at 0.5MPa through a G1/4 port. The direct replacement is the SAI40X215SN, matching the interface, force and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The NBR seal suits -20 to +70C; a Viton H option extends this. It uses CS1-B/DS1-B switches, while SAIL/BSAI lock variants solve load holding.
Airtac SI40 Standard Cylinder SI40X215SN Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X215SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X215SN |
| Bore size | Ø40 mm |
| Stroke | 215 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 SAI40X215SN 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 SAI40X215SN 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 SI40X215SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×215 | 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 SI40X215SN Is Used
Package Diversion
Ideal for pushing medium-weight cartons off a belt line using the 628N push force at 0.5MPa.
Clamp Actuation
Provides reliable holding pressure for secondary machining operations within a 215mm travel range.
Replacing the Airtac SI40 Standard Cylinder SI40X215SN with the SAI40X215SN
To replace the SI40X215SN, order the SAI40X215SN: it preserves the 40mm bore, 215mm stroke, M12x1.25 rod thread, G1/4 port, and ISO 15552 mounting. Keep the -S magnet for CS1-B/DS1-B sensing and the -N NBR seal. If sizing up, a 50mm bore offers 982N push at 0.5MPa; if sizing down, a 32mm bore gives 402N. Because stroke is 215mm, ensure guide alignment to prevent rod bending. A plain cylinder drifts on air loss; for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X215SN
- ✓ 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 SI40X215SN FAQ
Yes, the SI40X215SN is discontinued. The direct replacement is the SAI40X215SN, a current ISO 15552 cylinder with identical 40mm bore, 215mm stroke, G1/4 port and mounting interface.
It has a G1/4 port. Force outputs are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a maximum theoretical force of 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X215SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X215SN replacement — usually within 7-8 hours.