This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X630, 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 SI40X630
The AirTAC Airtac SI40 Standard Cylinder SI40X630 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 630mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X630, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke630 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X630
- 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 SI40X630
The AirTAC SI40X630 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 630mm stroke. Delivering 628N push force at 0.5MPa, it is replaced by the SAI40X630. This direct upgrade shares the exact ISO 15552 mounting interface, 16mm rod, G1/4 port, and force ratings. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For sensing, note this specific SI40X630 SKU lacks a magnet and cannot accept a CS1-B/DS1-B switch.
The SAI family also introduces variants the legacy SI lacked, such as the SAIL air-released lock and SAIF integrated 4M valve (bores 32-100). Operating pressure is 0.15-1.0MPa, with seal options including NBR and Viton H for high-temperature environments up to 150C.
Airtac SI40 Standard Cylinder SI40X630 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X630 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X630 |
| Bore size | Ø40 mm |
| Stroke | 630 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 SAI40X630 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 SAI40X630 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 SI40X630
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×630 | 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 SI40X630 Is Used
Package Diverting
Drives diverting arms on packaging lines where the 628N push force at 0.5MPa easily shifts light to medium cartons across transfer belts.
Vertical Lowering
Controls the gravity-assisted descent of a 32kg payload, relying on the adjustable 27mm air cushions to decelerate smoothly at stroke end.
Gate Actuation
Opens and closes long-reach machine safety gates, requiring external guide rails to support the extended 630mm stroke and prevent rod bending.
Replacing the Airtac SI40 Standard Cylinder SI40X630 with the SAI40X630
To replace the discontinued SI40X630, order the SAI40X630. Confirm the ISO 15552 mounting interface (LB, FA, FB, CA, CB, TC) matches your fixture, along with the 40mm bore, 630mm stroke, and G1/4 port (available in PT, G, or NPT). Because this SKU lacks the -S magnet, it cannot support position sensing; if sensing is required, order the SAI40X630S. Sizing both ways: the 40mm bore yields 628N push at 0.5MPa, while the neighboring 32mm bore offers 402N and the 50mm offers 982N. For a 630mm stroke, external guides are recommended to prevent rod bending and side-load wear. 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 → SAI40X630
- ✓ 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 SI40X630 FAQ
Yes, the AirTAC SI40X630 is discontinued. The direct replacement is the SAI40X630. It shares the same ISO 15552 mounting interface, 40mm bore, 630mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40mm bore features a G1/4 port and M12x1.25 rod thread. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128kgf at 1.0MPa. Speed range is 30-800mm/s.
Request a Quote for the SAI40X630
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X630 replacement — usually within 7-8 hours.