This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X350, 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X350, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X350
- 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350
The AirTAC B04-SID40X350 is a double-acting, double-rod ISO 15552 cylinder where the rod exits both ends, making push and pull force equal at 528 N @0.5 MPa. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the base SID40X350, mechanically identical with a 40mm bore, 350mm stroke, G1/4 port, and M12x1.25 rod thread. This SID model is discontinued; the direct replacement is the SAID40X350, which reuses the same ISO 15552 mounting interface and adds an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and long life.
Because the second rod acts as an anti-rotation guide and can drive a second tool simultaneously, it is highly effective for heavy-equipment frames. The bore uses a 27mm adjustable air cushion at each end and operates at 30-800 mm/s. Note this non-magnetic SKU cannot take a sensor switch, and the air cushion only decelerates; it does not hold loads on air loss.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X350 |
| Bore size | Ø40 mm |
| Stroke | 350 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 B04-SAID40X350 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 B04-SAID40X350 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 Is Used
Excavator Linkage
Fits construction-machinery dedicated assemblies where equal push/pull force drives dual-tool mechanisms without rotational play.
Heavy-Equipment Clamp
Provides stable opposing clamping on heavy-equipment frames using the second rod as a built-in anti-rotation guide.
Synchronized Actuation
Drives two separate construction-machinery functions simultaneously from one piston, ensuring perfectly synchronized motion.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 with the B04-SAID40X350
To replace the discontinued B04-SID40X350, select the SAID40X350 direct upgrade, matching the 40mm bore, 350mm stroke, G1/4 port, and ISO 15552 mounting footprint (Basic, FA, LB, TC). Size both ways by checking neighbour bores if you need to adjust the equal both-ways force of 528 N @0.5 MPa. A double-rod design is right when you need anti-rotation stability or must drive two tools from one piston. For the 350mm stroke, use external guides to prevent rod bending under side-load. Because this SKU lacks the -S magnet, it cannot use sensors. For load-holding without live air, use an external rod lock or the SAIL/BSAI lock variant, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X350
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350 FAQ
Yes, the B04-SID40X350 is discontinued. The direct replacement is the SAID40X350. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X350. The SAID40X350 shares the exact same ISO 15552 interface, 40mm bore, 350mm stroke, G1/4 port, and mounting, but adds an upgraded piston seal.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The air port is G1/4.
Related AirTAC SAI Cylinders
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