This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X800S, 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-SID50X800S
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X800S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 800mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X800S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X800S
- 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-SID50X800S
The AirTAC B04-SID50X800S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the base SID50X800S. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal (825 N @0.5 MPa). This model is discontinued; the direct replacement is the SAID50X800S, sharing the same 50 mm bore, 800 mm stroke, G1/4 port, and ISO 15552 mounting interface.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. A double-rod design prevents rotation and lets the back rod carry a sensor cam. Note that air cushions only decelerate; use an external rod lock or SAIL/BSAI variant to hold loads without live air.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X800S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X800S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X800S |
| Bore size | Ø50 mm |
| Stroke | 800 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-SAID50X800S 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-SAID50X800S 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-SID50X800S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×800 | 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-SID50X800S Is Used
Excavator Linkage Actuation
Drives dual-tool mechanisms on heavy equipment where equal push/pull force and high resistance to side-loading are critical for the 800 mm stroke.
Loader Synchronized Gates
Uses the back rod end to carry a sensor cam for position feedback while the front rod shifts heavy construction-machinery gates without rotation.
Crane Extension Guides
Provides stable, equal-both-ways motion for extending structural guides on construction cranes, relying on ISO 15552 mounting for rigid frame integration.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X800S with the B04-SAID50X800S
To replace the discontinued B04-SID50X800S, use the direct replacement SAID50X800S, reusing the exact ISO 15552 mounting (Basic, FA, LB, TC) and the G1/4 port. Size both ways by confirming the 825 N @0.5 MPa equal force is sufficient; if not, step to the 63 mm bore (1402 N) or down to 40 mm (528 N). A double rod is right when you need anti-rotation or must drive two tools. The -S magnet supports legacy CS1-B/DS1-B sensors. For the 800 mm stroke, add external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X800S
- ✓ 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-SID50X800S FAQ
Yes, the B04-SID50X800S is discontinued. The B04- prefix marks it as a construction-machinery dedicated variant of the SID50X800S. The direct replacement is the SAID50X800S, which is mechanically identical with the same 50 mm bore, 800 mm stroke, G1/4 port, and ISO 15552 mounting, but features an upgraded piston seal.
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 air port is G1/4, the rod thread is M16x1.5, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X800S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X800S replacement — usually within 7-8 hours.