This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X630S, 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 SI40X630S
The AirTAC Airtac SI40 Standard Cylinder SI40X630S 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 SAI40X630S, 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 → SAI40X630S
- 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 SI40X630S
The AirTAC SI40X630S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40mm bore, 630mm stroke, and a G1/4 air port. Delivering 628N push force at 0.5MPa, it is replaced by the direct replacement SAI40X630S, which shares identical mounting, force, and porting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The original -S magnet supports CS1-B/DS1-B sensors, while SAI adds SAIL lock and SAIF valve variants.
Airtac SI40 Standard Cylinder SI40X630S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X630S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X630S |
| 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 SAI40X630S 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 SAI40X630S 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 SI40X630S
| 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 SI40X630S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 628N push force at 0.5 MPa, requiring external guides to manage the 630mm stroke.
Component Ejection
Ejects machined parts from fixtures using the 528N pull force at 0.5 MPa, cycling at 30-800 mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X630S with the SAI40X630S
To replace this SI40X630S, order the SAI40X630S ensuring the ISO 15552 mounting interface, 630mm stroke, G1/4 port, and magnet option match. For a 630mm stroke, use external guides to prevent rod bending and side-load wear. If downsizing to a 32mm bore yields enough force (402N push at 0.5MPa), or upsizing to 50mm gives 982N, adjust accordingly. This 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 → SAI40X630S
- ✓ 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 SI40X630S FAQ
Yes, the SI40X630S is discontinued. The direct replacement is the SAI40X630S. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 630mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port, a 16mm rod, and M12x1.25 thread. It delivers 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, with a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X630S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X630S replacement — usually within 7-8 hours.