This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X80S, 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-SID50X80S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X80S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X80S
- 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-SID50X80S
The AirTAC B04-SID50X80S 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 SID50X80S. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal at 825 N @0.5 MPa. This model is discontinued and drops in directly to the SAID50X80S, which retains the G1/4 port, M16x1.5 thread, and 30 mm cushions.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. The double rod prevents rotation and lets the rear rod carry a sensor cam. Note that air cushions only decelerate; for load holding without live air, use an external rod lock or SAIL/BSAI variant.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X80S |
| Bore size | Ø50 mm |
| Stroke | 80 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-SAID50X80S 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-SAID50X80S 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-SID50X80S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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-SID50X80S Is Used
Excavator Linkage Actuation
Drives secondary construction machinery covers or access panels where equal push and pull force is needed to overcome dirt and debris resistance in both directions.
Heavy Equipment Material Sorting
Pushes and pulls a diverter gate on an aggregate conveyor using both rod ends, ensuring positive positioning without rotational drift.
Crusher Tool Indexing
Indexes a wear-component adjustment tool on a rock crusher, using the rear rod to carry a sensor cam for position feedback.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X80S with the B04-SAID50X80S
Replace the discontinued B04-SID50X80S directly with the SAID50X80S, reusing the exact ISO 15552 mounting interface and FA, LB, or TC brackets. When sizing both ways, verify the equal 825 N @0.5 MPa force is sufficient, or step up to the 63 mm bore for higher loads. Choose a double-rod cylinder when anti-rotation is required or when the back rod must drive a second tool. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches. For strokes over 300 mm, account for side-load deflection to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X80S
- ✓ 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-SID50X80S FAQ
Yes, it is discontinued. The direct replacement is the SAID50X80S. The B04- prefix simply denotes the construction-machinery dedicated variant; the SAID replacement shares the identical 50 mm bore, 80 mm stroke, G1/4 port, and ISO 15552 mounting interface.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a 20 mm rod, M16x1.5 thread, 30 mm adjustable cushions, and operates at 0.15-1.0 MPa with speeds of 30-800 mm/s. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X80S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X80S replacement — usually within 7-8 hours.