This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X150S, 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-SID50X150S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X150S
- 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-SID50X150S
The AirTAC B04-SID50X150S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on a single piston, ensuring push and pull force is equal both ways (825 N at 0.5 MPa). The leading B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the base SID50X150S, mechanically identical to the standard line with a 50 mm bore, 150 mm stroke, G1/4 port, and M16x1.5 rod thread. This discontinued model is fully replaced by the SAID50X150S, offering a direct ISO 15552 interface interchange without changing mounting or port locations.
Because both faces use the rod-side area, the double-rod design provides inherent anti-rotation properties and allows the back rod to carry a sensor cam for dual-position feedback. The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note that a plain cylinder does not hold loads on air loss; the adjustable 30 mm cushions only decelerate near stroke end, so external rod locks or SAIL/BSAI variants are needed for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X150S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X150S |
| Bore size | Ø50 mm |
| Stroke | 150 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-SAID50X150S 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-SAID50X150S 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-SID50X150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×150 | 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-SID50X150S Is Used
Excavator Linkage Control
Uses the equal both-ways force of the double-rod design to precisely actuate auxiliary linkage components on heavy construction equipment without single-rod push drift.
Concrete Batch Gate
Employs the back rod to carry a sensor cam, providing dual-position feedback for aggregate gating while the front rod drives the shutter in dusty plant environments.
Loader Attachment Brake
Drives two synchronized tooling arms from one piston, ensuring parallel actuation on heavy-equipment attachments where anti-rotation stability is critical.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X150S with the B04-SAID50X150S
To replace the discontinued B04-SID50X150S, select the SAID50X150S, which provides an direct ISO 15552 interface interchange with identical 50 mm bore, 150 mm stroke, G1/4 port, and FA/LB/TC mounting compatibility. When sizing both ways, verify your application requires equal force in both directions (825 N at 0.5 MPa); if higher force is needed, step up to the 63 mm bore, or drop to the 40 mm bore for lighter loads. A double rod is the right choice when you need anti-rotation stability or want to drive two tools simultaneously from one cylinder. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. For this 150 mm stroke, side-load alignment is generally manageable, but for any stroke over 300 mm, carefully calculate guide bearing loads to prevent premature wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X150S
- ✓ 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-SID50X150S FAQ
Yes, the B04-SID50X150S is discontinued. The direct replacement is the SAID50X150S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID50X150S, and the SAID replacement shares the exact same ISO 15552 mounting interface, 50 mm bore, 150 mm stroke, G1/4 port, and equal both-ways force.
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. It operates at 0.15-1.0 MPa, runs at 30-800 mm/s, and has a G1/4 port. The adjustable 30 mm cushions only decelerate the load; they do not hold it on air loss.
Related AirTAC SAI Cylinders
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