This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X280, 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 SI40X280
The AirTAC Airtac SI40 Standard Cylinder SI40X280 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 280mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X280, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X280
- 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 SI40X280
The AirTAC SI40X280 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 280mm stroke, delivering 628N push force at 0.5MPa. The direct replacement is the SAI40X280, which shares the exact same G1/4 port, M12x1.25 rod thread, and ISO 15552 mounting interface for seamless fixture integration.
This SAI upgrade introduces an improved piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note this specific SI40X280 SKU lacks a magnet, so it cannot accept CS1-B or DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X280 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X280 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X280 |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAI40X280 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 SAI40X280 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 SI40X280
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SI40X280 Is Used
Package Diverting
Actuates routing gates on 40mm bore conveyors, providing 628N push at 0.5MPa to deflect medium-weight cartons reliably.
Clamp Actuation
Drives 280mm stroke clamping arms to secure aluminium extrusions during machining operations without exceeding safe load limits.
Vertical Lifting
Raises lightweight tote bins up to 32kg in pick-and-place cells, utilizing the 27mm adjustable air cushions for smooth end-of-stroke deceleration.
Replacing the Airtac SI40 Standard Cylinder SI40X280 with the SAI40X280
To replace the discontinued SI40X280, order the SAI40X280, verifying your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/4 port thread (PT/G/NPT), and 280mm stroke. Because this non-magnet SKU cannot support position sensing, upgrade to an SAI40X280S if you require CS1-B or DS1-B switches. Sizing both ways: the 40mm bore yields 628N push at 0.5MPa, while the neighbouring 50mm bore offers 982N if you need more force. For this 280mm stroke, ensure adequate guide support to prevent rod bending and side-load wear. Remember that a standard cylinder drifts on air loss; for load holding, specify the SAIL lock, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X280
- ✓ 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 SI40X280 FAQ
Yes, the SI40X280 is discontinued. The direct replacement is the AirTAC SAI40X280. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 280mm stroke, G1/4 port, and mounting interface. You simply order the SAI40X280 for your existing fixtures.
The 40mm bore operates on a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa, with an operating speed range of 30-800mm/s.
Request a Quote for the SAI40X280
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X280 replacement — usually within 7-8 hours.