This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID32X400S, 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-SID32X400S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID32X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø32mm bore and 400mm stroke, G1/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID32X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ32 mm
- Stroke400 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- StatusDiscontinued → B04-SAID32X400S
- 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-SID32X400S
The AirTAC B04-SID32X400S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SID32X400S. A rod exits both ends on a single piston, meaning both faces use the rod-side area and push/pull force is equal both ways at 345 N @0.5 MPa. This model is discontinued; the direct replacement is the SAID32X400S, which shares the same 32mm bore, 400mm stroke, G1/8 port, and ISO 15552 mounting interface. The SAI family also uses an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Because the second rod acts as an anti-rotation guide and can carry a sensor cam, it prevents twist during operation. The bore dictates a 12mm rod, M10x1.25 thread, and 27mm adjustable cushions at each end. Note that air cushions only decelerate near stroke end; a plain cylinder does not hold loads on air loss, so use an external rod lock or pilot-operated check valve for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID32X400S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID32X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID32X400S |
| Bore size | Ø32 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| 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 1000 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID32X400S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø32mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 402 N | 346 N |
| 0.7 MPa | 563 N | — |
| Max (@1.0 MPa) | 82 kgf | |
The B04-SAID32X400S 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-SID32X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 32 | Bore size in mm. |
| ×400 | 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-SID32X400S Is Used
Excavator Valve Actuation
Drives dual pilot valves in heavy equipment with equal push and pull force, using the back rod as a stable sensor cam target for precise positioning.
Loader Linkage Sync
Provides anti-rotation stability for synchronized gripping arms on construction machinery, ensuring the mechanism does not twist under offset loads.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID32X400S with the B04-SAID32X400S
To replace the discontinued B04-SID32X400S, select the SAID32X400S direct upgrade, keeping the exact 32mm bore, 400mm stroke, G1/8 port, and ISO 15552 mounting footprint. Size both ways by confirming the 345 N @0.5 MPa equal force is sufficient; if more force is needed, step up to the 40mm bore (528 N @0.5 MPa). A double-rod design is right when you need anti-rotation stability or must drive two tools simultaneously. Reuse FA, LB, or TC mounts directly. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. For this 400mm stroke, add external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID32X400S
- ✓ 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-SID32X400S FAQ
Yes, the B04-SID32X400S is discontinued. The direct replacement is the SAID32X400S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID32X400S, so all physical specs, including the 32mm bore, 400mm stroke, G1/8 port, and ISO 15552 interface, remain identical to the SAID replacement.
Because it is a double-rod cylinder, force is equal both ways: 345 N @0.5 MPa, 483 N @0.7 MPa, and 621 N @0.9 MPa. It operates at 30-800 mm/s with a 12mm rod, M10x1.25 thread, and 27mm adjustable cushions at each end.
Related AirTAC SAI Cylinders
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