This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X350S, 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-SID40X350S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X350S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X350S
- 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-SID40X350S
The AirTAC B04-SID40X350S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 528N, 739N, and 950N. The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the base SID40X350S. It features a 16mm rod, M12x1.25 thread, and a G1/4 port. This SID model is discontinued; the direct replacement is the SAID40X350S, which reuses the same ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure.
Because both faces use the rod-side area, the equal-both-ways force prevents rod drift and allows the back rod to carry a sensor cam. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X350S |
| Bore size | Ø40 mm |
| Stroke | 350 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID40X350S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The B04-SAID40X350S 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-SID40X350S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | 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-SID40X350S Is Used
Excavator Panel Pusher
Equal both-ways force on a 40mm bore drives and retracts heavy cab panels on construction machinery without drift.
Crane Fixture Sync
The back rod carries a sensor cam to track clamp position on heavy-equipment jigs, ensuring precise actuation.
Loader Linkage Shift
Double-rod anti-rotation properties keep the lateral shift mechanism stable while moving heavy components.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X350S with the B04-SAID40X350S
To replace the discontinued B04-SID40X350S, specify the SAID40X350S, which matches the 40mm bore, 350mm stroke, G1/4 port, and ISO 15552 mounting footprint (Basic, FA, LB, TC). When sizing, remember the double-rod design yields equal force both ways (528N @0.5MPa), so verify your load against the smaller pull area rather than a larger single-rod push value. If more force is needed, step up to the 50mm bore. Choose a double-rod cylinder when you need anti-rotation stability or need to drive two tools simultaneously. For this 350mm stroke, add external guides to prevent rod bending under side loads. The -S magnet supports legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X350S
- ✓ 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-SID40X350S FAQ
Yes, the B04-SID40X350S is discontinued. The direct replacement is the SAID40X350S. It shares the same ISO 15552 interface, 40mm bore, 350mm stroke, G1/4 port, and equal both-ways force. The B04- prefix simply marks it as construction-machinery dedicated; the SAI upgrade adds a two-piece Y-shaped piston seal for longer life.
Force is equal both ways: 528N @0.5MPa, 739N @0.7MPa, and 950N @0.9MPa. The bore is 40mm with a G1/4 port, 16mm rod, and M12x1.25 thread. Speed is 30-800mm/s. Air cushions only decelerate; use an external rod lock for load holding.
Related AirTAC SAI Cylinders
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