This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X300S, 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-SID40X300S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300S 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-SAID40X300S, 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-SAID40X300S
- 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-SID40X300S
The AirTAC B04-SID40X300S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, generating equal force in both directions (528 N at 0.5 MPa). The B04- prefix designates this as a construction-machinery dedicated variant of the base SID40X300S, mechanically identical to the standard line with a 16 mm rod, M12x1.25 thread, and G1/4 port. This legacy model is discontinued, with the SAID40X300S serving as the direct replacement.
The SAI replacement family introduces an upgraded piston seal using two Y-shaped one-way elements for lower start-up pressure and longer life. Because both faces use the rod-side area, the push and pull forces are identical, preventing rod drift and allowing the back rod to carry a sensor cam. Note that air cushions only decelerate the piston near stroke end; for load holding on air loss, an external rod lock or pilot-operated check valve is required.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X300S |
| 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-SAID40X300S 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-SAID40X300S 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-SID40X300S
| 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-SID40X300S Is Used
Excavator Linkage Actuation
Drives secondary construction machinery mechanisms with equal push and pull force, utilizing the double-rod geometry to prevent drift during hydraulic system backups.
Heavy Equipment Transfer
Moves components along construction machinery assembly lines, using the back rod to carry a sensor cam for precise position feedback in harsh environments.
Synchronized Tool Driving
Powers dual tooling attachments from both rod ends simultaneously, ensuring balanced actuation and anti-rotation stability for heavy-equipment fabrication.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X300S with the B04-SAID40X300S
To replace the discontinued B04-SID40X300S, specify the SAID40X300S, which matches the 40 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting interface. Size both directions by verifying the equal 528 N force at 0.5 MPa is sufficient; if higher force is needed, step up to the 50 mm bore. A double-rod design is the right choice when equal push/pull force, anti-rotation stability, or dual-tool driving is required. Existing FA, LB, or TC mounts can be reused directly. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Because the stroke is 300 mm, verify external guide alignment to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X300S
- ✓ 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-SID40X300S FAQ
Yes, the B04-SID40X300S is discontinued. The direct replacement is the SAID40X300S. The B04- prefix simply marks it as the construction-machinery dedicated variant; the SAID replacement shares the identical 40 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting interface.
Force is equal both ways due to the double-rod design: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa. Operating speed ranges from 30 to 800 mm/s. The cylinder uses a G1/4 port and features 27 mm adjustable air cushions at each end to decelerate the load.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X300S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X300S replacement — usually within 7-8 hours.