This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X300, 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-SID50X300
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300 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-SAID50X300, 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-SAID50X300
- 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-SID50X300
The AirTAC B04-SID50X300 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, generating identical push and pull force (825 N at 0.5 MPa). The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the standard SID50X300. It features a 50 mm bore, G1/4 port, and M16x1.5 rod thread. This SID model is discontinued; the direct replacement is the SAID50X300, which reuses the same ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because both faces use the rod-side area, force is equal both ways, preventing rod-side drift and allowing the rear rod to act as a sensor cam or drive a second tool simultaneously. Note this non-magnetic SKU cannot accept switches, and while adjustable 30 mm cushions decelerate near stroke end, a plain cylinder cannot hold loads on air loss—use an external rod lock or SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X300 |
| 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-SAID50X300 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-SAID50X300 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-SID50X300
| 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-SID50X300 Is Used
Excavator Linkage Actuation
Drives synchronized positioning arms on heavy equipment using equal both-ways force, ensuring stable push and pull movements without single-rod push drift.
Crusher Feed Gate
Regulates material flow on construction sites. The double-rod design provides equal force in both directions to reliably open and close heavy gates against debris.
Loader Attachment Shift
Shifts auxiliary tooling on construction loaders. The rear rod can simultaneously drive a secondary mechanical indicator while maintaining ISO 15552 mounting.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X300 with the B04-SAID50X300
To replace the discontinued B04-SID50X300, specify the SAID50X300 direct: it matches the 50 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC). Size both directions using the equal-both-ways force (825 N @0.5 MPa); if more force is needed, step up to the 63 mm bore (1402 N @0.5 MPa), or step down to the 40 mm bore (528 N @0.5 MPa) for lighter duties. A double-rod design is correct when you need anti-rotation stability or identical extension/retraction speeds. Because this is a 300 mm stroke, verify side-load limits and add external guides to prevent rod bending. This SKU lacks the -S magnet, so it cannot use magnetic switches; choose SAID50X300-S if sensing is required.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X300
- ✓ 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-SID50X300 FAQ
Yes, the B04-SID50X300 (construction-machinery dedicated SID50X300) is discontinued. The direct replacement is the SAID50X300. It shares the same 50 mm bore, 300 mm stroke, G1/4 port, and ISO 15552 mounting interface, but features an upgraded piston seal. The B04- prefix simply denotes the construction machinery designation and does not alter physical specs.
Because it is a double-rod cylinder, force is equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The air port is G1/4. Speed range is 30-800 mm/s, and it features 30 mm adjustable cushions at each end.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X300
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X300 replacement — usually within 7-8 hours.