This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X38S, 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 SI40X38S
The AirTAC Airtac SI40 Standard Cylinder SI40X38S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 38mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X38S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke38 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X38S
- 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 SI40X38S
The AirTAC SI40X38S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 38 mm stroke, delivering 628 N push force at 0.5 MPa through its G1/4 port. The direct replacement is the SAI40X38S, matching the interface, bore, stroke, force, and mounting.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI-S uses CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X38S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X38S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X38S |
| Bore size | Ø40 mm |
| Stroke | 38 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 SAI40X38S 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 SAI40X38S 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 SI40X38S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×38 | 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 SI40X38S Is Used
Small Part Ejection
Ideal for pushing lightweight finished components out of a machining center using its 628 N push force.
Package Diverting
Provides reliable 38 mm stroke actuation to deflect small cartons on a packaging line at up to 800 mm/s.
Clamp Actuation
Delivers precise clamping force for holding thin workpieces in place during light assembly operations.
Replacing the Airtac SI40 Standard Cylinder SI40X38S with the SAI40X38S
To replace this SI40X38S, order the SAI40X38S, confirming the ISO 15552 mounting interface, 40 mm bore, 38 mm stroke, G1/4 port, and magnet (-S). When sizing both ways, the neighboring 32 mm bore yields 402 N push at 0.5 MPa, while the 50 mm bore yields 982 N. Note that a plain cylinder drifts on air loss as the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant with a built-in 4M valve is also available for bores 32-100.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X38S
- ✓ 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 SI40X38S FAQ
Yes, the SI40X38S is discontinued. The direct replacement is the SAI40X38S, which shares the same ISO 15552 mounting interface, 40 mm bore, 38 mm stroke, output force, and G1/4 port.
The G1/4 port bore 40 mm cylinder delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X38S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X38S replacement — usually within 7-8 hours.