This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X300S, 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-SID50X300S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X300S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X300S
- 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-SID50X300S
The AirTAC B04-SID50X300S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as a construction-machinery dedicated variant, mechanically identical to the standard SID50X300S. A rod exits both ends on one piston, meaning both faces use the rod-side area to deliver equal force in both directions (825 N at 0.5 MPa). It features a 50 mm bore, G1/4 port, M16x1.5 rod thread, and a 300 mm stroke. This SID model is discontinued; the direct replacement is the SAID50X300S, which retains the same interface and adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life.
Because the second rod prevents piston rotation and can carry a sensor cam, it is ideal for heavy-equipment guidance tasks. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that a plain cylinder does not hold loads on air loss; the air 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-SID50X300S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X300S |
| Bore size | Ø50 mm |
| Stroke | 300 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-SAID50X300S 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-SAID50X300S 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-SID50X300S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | 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-SID50X300S Is Used
Excavator Linkage Actuation
Uses the equal both-ways force and double-rod anti-rotation properties to precisely drive and balance heavy-equipment linkage components on construction machinery.
Crusher Tool Synchronization
Drives two opposing tools simultaneously from a single piston, leveraging the 50 mm bore and 825 N force at 0.5 MPa for reliable material processing.
Heavy-Equipment Sensor Cam
The rear rod carries a sensor cam for position feedback, while the front rod handles the 300 mm stroke work, ensuring precise positioning in construction builds.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300S with the B04-SAID50X300S
To replace the discontinued B04-SID50X300S, select the SAID50X300S, which offers a direct solution matching the 50 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting interface (Basic, FA, LB, TC). Size both ways by verifying the equal push/pull force of 825 N at 0.5 MPa; if higher force is needed, step up to the 63 mm bore (1402 N), or drop to the 40 mm bore (528 N) if lower force suffices. Choose a double-rod configuration when anti-rotation or driving two tools simultaneously is required. The -S magnet supports legacy CS1-B/DS1-B sensors. For this 300 mm stroke, factor in side-load and rod-bending stresses by using external guides to prevent premature wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X300S
- ✓ 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-SID50X300S FAQ
Yes, the B04-SID50X300S is discontinued. The direct replacement is the SAID50X300S. The B04- prefix simply denotes the construction-machinery dedicated variant; the SAID50X300S matches its 50 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting, while adding an upgraded piston seal.
Force is equal both ways due to the double-rod design: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The bore is 50 mm, the air port is G1/4, and the rod thread is M16x1.5. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
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