This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X300, 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-SID40X300
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X300, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X300
- 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-SID40X300
The AirTAC B04-SID40X300 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 528N @0.5MPa. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the SID40X300, mechanically identical to the base model with a 16mm rod, M12x1.25 thread, and G1/4 port. This SKU has no -S magnet and cannot carry a sensor. The SID line is discontinued; the direct replacement is the SAID40X300, which reuses the same ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure.
Because both faces use the rod-side area, force is identical in both directions (528/739/950N at 0.5/0.7/0.9MPa). The dual rods resist rotation and let the back rod drive a second tool. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variants.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X300 |
| Bore size | Ø40 mm |
| Stroke | 300 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-SAID40X300 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-SAID40X300 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-SID40X300
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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-SID40X300 Is Used
Excavator Linkage Actuation
Drives synchronized dual-tool operations on heavy equipment linkages where equal push/pull force and high anti-rotation resistance are critical.
Crusher Screen Alignment
Positions vibrating screens in aggregate crushers, using the back rod to mechanically mirror a secondary flap while handling 27kg vertical loads.
Loader Attachment Shift
Shifts auxiliary attachments on construction loaders, relying on the 40mm bore's 528N @0.5MPa equal-both-ways thrust for stable tool positioning.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300 with the B04-SAID40X300
To replace the discontinued B04-SID40X300, specify SAID40X300 (insert an A after the leading S); it is a direct swap retaining the 40mm bore, 300mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). Size both ways by confirming the 528N @0.5MPa equal force fits your load, or step to neighbouring bores (32mm or 50mm) for different thrust. Choose a double-rod cylinder when you need anti-rotation stability or must drive two tools from one piston. This SKU lacks the -S magnet, so it cannot accept magnetic switches; if sensing is required, select an -S model. For this 300mm stroke, use external guides to prevent rod bending under side loads. The cylinder does not hold loads on air loss—use an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X300
- ✓ 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-SID40X300 FAQ
Yes, the SID series is discontinued. The direct replacement is the SAID40X300. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X300. The SAID40X300 shares the exact same 40mm bore, 300mm stroke, G1/4 port, and ISO 15552 mounting interface, but adds an upgraded piston seal.
Force is equal both ways because it is a double-rod cylinder: 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. The air port is G1/4, the rod is 16mm with an M12x1.25 thread, and speed ranges 30-800mm/s. Air cushions only decelerate; use an external rod lock for load holding.
Related AirTAC SAI Cylinders
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