This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X900S, 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-SID50X900S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 900mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X900S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X900S
- 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-SID50X900S
The AirTAC B04-SID50X900S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X900S, mechanically identical in every spec. Because a rod exits both ends on the single piston, push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a 50mm bore, G1/4 air port, M16x1.5 rod thread, and a 30mm adjustable cushion at each end. This legacy SID model is discontinued and the direct replacement is the SAID50X900S, sharing the same ISO 15552 interface, bore, stroke, and mounting.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. For double-rod benefits, the back rod can carry a sensor cam while the front rod drives a tool, providing anti-rotation stability. 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 or SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X900S |
| Bore size | Ø50 mm |
| Stroke | 900 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-SAID50X900S 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-SAID50X900S 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-SID50X900S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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-SID50X900S Is Used
Excavator Linkage Actuation
Drives secondary construction-machinery mechanisms where equal push and pull force is required on both extension and retraction of heavy equipment components.
Dual-Tool Synchronized Drive
Uses both protruding rods simultaneously to operate two separate tooling stations or mechanisms from one central ISO 15552 cylinder body.
Cam-Driven Position Feedback
The rear rod extends through the back cap to carry a sensor cam, allowing external legacy CS1-B/DS1-B switches to track piston position without interfering with the primary work tool.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X900S with the B04-SAID50X900S
To replace the discontinued B04-SID50X900S, specify the SAID50X900S, which is a direct swap retaining the 50mm bore, 900mm stroke, G1/4 port, and ISO 15552 mounting dimensions (Basic, FA, LB, TC, FTC, TCM1, TCM2). Size both ways by checking the equal-both-ways force: if 825 N @0.5 MPa is insufficient, step up to the 63mm bore (1402 N); if oversized, step down to the 40mm bore (528 N). A double-rod design is right when you need equal push/pull force, anti-rotation resistance, or a secondary back rod to carry a sensor cam. The -S suffix means the piston magnet is present for legacy CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 900mm stroke, external guides are recommended to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X900S
- ✓ 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-SID50X900S FAQ
Yes, the B04-SID50X900S is discontinued. The direct replacement is the SAID50X900S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SID50X900S, so mechanically the SAID50X900S matches the 50mm bore, 900mm stroke, G1/4 port, and ISO 15552 mounting interface perfectly. The SAI family also adds upgraded Y-shaped piston seals and SAIL/BSAI lock variants the SI line lacked.
Because it is a double-rod cylinder, force is equal both ways (no larger single-rod push value applies). It delivers 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and the G1/4 port handles the air flow.
Related AirTAC SAI Cylinders
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