This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID80X350S, 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-SID80X350S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 350mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID80X350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke350 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAID80X350S
- 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-SID80X350S
The AirTAC B04-SID80X350S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the base SID80X350S, mechanically identical to it. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal both ways at 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. It features a 25 mm rod, M20x1.5 thread, and a G3/8 port. This SID model is discontinued and the direct replacement is the SAID80X350S, sharing the same ISO 15552 interface, bore, stroke, and mounting.
The double-rod design prevents rod rotation and allows the back rod to carry a sensor cam or drive a second tool simultaneously. The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. A plain cylinder does not hold loads on air loss; the air 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-SID80X350S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID80X350S |
| Bore size | Ø80 mm |
| Stroke | 350 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID80X350S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The B04-SAID80X350S 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-SID80X350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×350 | 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-SID80X350S Is Used
Excavator Linkage Control
Drives dual-tool mechanisms on heavy equipment with equal push and pull force, leveraging the 25 mm rod to handle rugged construction cycles.
Crane Synchronization
Uses the back rod to carry a sensor cam for feedback while moving loads, ensuring precise coordination without rod rotation in machinery.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID80X350S with the B04-SAID80X350S
To replace the discontinued B04-SID80X350S, specify the SAID80X350S, which provides a direct solution retaining the G3/8 port, M20x1.5 rod thread, and 36 mm adjustable cushion. When sizing both ways, verify the equal force of 2268 N @0.5 MPa fits your load, or step to the 100 mm bore for higher force. A double rod is right when you need anti-rotation, dual-end actuation, or a back rod for sensor cams. Mounting uses FA, LB, or TC brackets via the ISO 15552 interface. The -S magnet enables position sensing. For the 350 mm stroke, use external guides to prevent rod bending under side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID80X350S
- ✓ 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-SID80X350S FAQ
Yes, the B04-SID80X350S is discontinued. The direct replacement is the SAID80X350S. The B04- prefix marks it as a construction-machinery dedicated variant of the base SID80X350S, and the SAI replacement is mechanically identical, sharing the same ISO 15552 interface, bore, stroke, and mounting.
Because it is a double-rod cylinder, force is equal both ways: 2268 N @0.5 MPa, 3175 N @0.7 MPa, and 4082 N @0.9 MPa. The bore is 80 mm with a G3/8 air port, a 25 mm rod, and an M20x1.5 rod thread. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID80X350S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID80X350S replacement — usually within 7-8 hours.