This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X50, 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-SID40X50
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X50
- 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-SID40X50
The AirTAC B04-SID40X50 is a double-acting double-rod ISO 15552 cylinder where a rod exits both ends on one piston, making push and pull force equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the base SID40X50, mechanically identical to it with a 40 mm bore, 50 mm stroke, 16 mm rod, G1/4 port, and M12x1.25 thread. This SKU lacks a -S magnet and cannot take a magnetic switch.
This discontinued model is fully replaced by the direct replacement SAID40X50, which reuses the exact ISO 15552 mounting interface, porting, and equal-both-ways force. The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. A double-rod design prevents rod rotation and lets the back rod carry a sensor cam or drive a second tool.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X50 |
| Bore size | Ø40 mm |
| Stroke | 50 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-SAID40X50 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-SAID40X50 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-SID40X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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-SID40X50 Is Used
Excavator Linkage
Equal push and pull force actuates a secondary hydraulic control linkage on heavy equipment, using the back rod to drive a mirrored mechanism without rotational play.
Crane Gripper Sync
The double-rod architecture synchronizes a dual-jaw construction gripper, pushing one jaw while pulling the other with identical 528 N force at 0.5 MPa.
Paver Spreader Gate
Anti-rotation stability from the dual-rod design precisely modulates an asphalt paver flow gate, handling the 27 kg vertical load margin safely.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X50 with the B04-SAID40X50
To replace the B04-SID40X50, install the direct replacement SAID40X50, which matches the 40 mm bore, 50 mm stroke, G1/4 port, and ISO 15552 mounting footprint without bracket changes. Size both ways by verifying the equal push/pull force of 528 N @0.5 MPa meets your load, or step up to a 50 mm bore if higher force is needed. A double rod is right when you need anti-rotation stability or must drive two tools from one piston. Reuse FA, LB, or TC mounts. Because this SKU has no -S magnet, add external sensors if needed. For any stroke over 300 mm, calculate side-load bearing limits to prevent guide wear. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or pilot-operated check valve, or specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X50
- ✓ 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-SID40X50 FAQ
Yes, the B04-SID40X50 is discontinued. The direct replacement is the SAID40X50. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X50. The SAID40X50 shares the exact ISO 15552 mounting interface, 40 mm bore, 50 mm stroke, G1/4 port, and equal both-ways force, but adds an upgraded Y-shaped piston seal for longer life.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm with a G1/4 air port and M12x1.25 rod thread. It operates at 0.15-1.0 MPa with adjustable 27 mm cushions at each end. It lacks a -S magnet so it cannot use magnetic switches, and air cushions only decelerate the load without holding it on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X50
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