This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X400S, 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-SID50X400S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X400S
- 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-SID50X400S
The AirTAC B04-SID50X400S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. This means both faces use the rod-side area, so push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the base SID50X400S; it is mechanically identical, retaining the Ø20 mm rod, M16x1.5 thread, and G1/4 port. This legacy model is discontinued and the direct replacement is the SAID50X400S.
The SAID upgrade uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life, while reusing the exact ISO 15552 mounting interface. Because the second rod can carry a sensor cam or drive two tools simultaneously, double-rod designs excel at anti-rotation. Note that a plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X400S |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID50X400S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The B04-SAID50X400S 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-SID50X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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-SID50X400S Is Used
Excavator Linkage Actuation
Drives synchronized tooling on heavy equipment where the equal both-ways force and anti-rotation properties of the double rod maintain precise alignment under harsh construction-site conditions.
Crusher Feed Diversion
Uses the back rod to carry a sensor cam while the front rod pushes material gates, leveraging the G1/4 port and 1154 N @0.7 MPa force for reliable switching in aggregate plants.
Loader Attachment Sync
Powers dual tool arms simultaneously from one piston, ensuring balanced movement. The 400 mm stroke handles long travel while external guides manage side-load bending.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400S with the B04-SAID50X400S
To replace the discontinued B04-SID50X400S, specify the SAID50X400S, which matches the 50 mm bore, 400 mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). When sizing both ways, verify your load against the equal push/pull force of 825 N @0.5 MPa; if higher force is needed, step up to the 63 mm bore. Choose a double-rod cylinder when you need anti-rotation, a back rod to carry a sensor cam, or to drive two tools. The -S suffix provides a piston magnet for CS1-B/DS1-B switches. For this 400 mm stroke, add external guides to prevent rod bending under side loads. The SAI family also adds SAIL and BSAI lock variants for load holding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X400S
- ✓ 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-SID50X400S FAQ
Yes, the B04-SID50X400S (construction-machinery dedicated variant of SID50X400S) is discontinued. The direct replacement is the SAID50X400S, which shares the same ISO 15552 interface, 50 mm bore, 400 mm stroke, G1/4 port, and equal both-ways force. The SAI family uses an upgraded piston seal and current AirTAC switches.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The bore is 50 mm with a G1/4 air port, Ø20 mm rod, and M16x1.5 thread. The cushion only decelerates; it does not hold loads on air loss.
Related AirTAC SAI Cylinders
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