This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X450S, 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-SID40X450S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X450S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X450S
- 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-SID40X450S
The AirTAC B04-SID40X450S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The B04- prefix designates this as a construction-machinery dedicated variant, mechanically identical to the base SID40X450S with a 40 mm bore, G1/4 port, and M12x1.25 rod thread. This legacy model is discontinued and replaced directly by the SAID40X450S.
The direct replacement SAID40X450S shares the exact ISO 15552 interface, 450 mm stroke, and mounting options (Basic, FA, LB, TC), while upgrading to a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Because the second rod occupies piston area on both faces, force is equal both ways, allowing the back rod to carry a sensor cam for -S magnet switches.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X450S |
| Bore size | Ø40 mm |
| Stroke | 450 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-SAID40X450S 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-SAID40X450S 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-SID40X450S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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-SID40X450S Is Used
Excavator Linkage Actuation
Equal both-ways force and anti-rotation stability drive synchronized construction-machinery linkage components without deflection.
Heavy Equipment Material Transfer
The back rod carries a sensor cam to confirm stroke position while moving parts between assembly stations on heavy-equipment production lines.
Dual-Tool Synchronized Pressing
Drives two separate forming or pressing tools simultaneously from one piston, utilizing the equal push and pull force across the 450 mm stroke.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X450S with the B04-SAID40X450S
To replace the discontinued B04-SID40X450S, specify the SAID40X450S, which matches the 40 mm bore, 450 mm stroke, G1/4 port, and 528/739/950 N equal-both-ways force. Size both directions by checking neighboring bores (32 mm or 50 mm) if your application requires a different equal force profile. A double-rod design is ideal when you need anti-rotation stability or must drive two tools simultaneously. Reuse existing ISO 15552 FA, LB, or TC mounts. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches (SAID uses current switches). At 450 mm stroke, use external guides to prevent rod bending under side loads. For load holding, note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant, as cylinders drift without live air.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X450S
- ✓ 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-SID40X450S FAQ
Yes, the B04-SID40X450S is discontinued. The direct replacement is the SAID40X450S. The B04- prefix simply marks it as construction-machinery dedicated; mechanically, it is identical to the base SID40X450S. The SAID replacement shares the exact ISO 15552 interface, bore, stroke, and G1/4 port, but adds an upgraded piston seal.
Because it is a double-rod cylinder, force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The air port is G1/4, the rod thread is M12x1.25, and adjustable air cushions are 27 mm at each end.
Related AirTAC SAI Cylinders
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