This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X75, 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-SID40X75
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X75, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X75
- 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-SID40X75
The AirTAC B04-SID40X75 is a double-acting double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID40X75, mechanically identical in every spec. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. This model is discontinued; the direct replacement is the SAID40X75, which adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure. It features a 16 mm rod, M12x1.25 thread, 27 mm adjustable cushions, and a G1/4 port.
Because the second rod prevents piston drift and rotation, it is ideal for driving two synchronized tools or carrying a sensor cam, though this specific SKU lacks the -S magnet and cannot take a switch. Note that a plain cylinder does not hold loads on air loss—the cushion only decelerates near stroke end—so use an external rod lock or pilot-operated check valve for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X75 |
| Bore size | Ø40 mm |
| Stroke | 75 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-SAID40X75 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-SAID40X75 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-SID40X75
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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-SID40X75 Is Used
Excavator Control Linkage
Equal both-ways force actuates secondary control linkages on heavy equipment, preventing rod sag and maintaining precise positioning under varying hydraulic pressures.
Crane Outrigger Locking
The double-rod design drives synchronized locking pins on both sides of an outrigger housing, ensuring stable deployment and retraction without rotational twist.
Concrete Mixer Gate
Opens and closes discharge gates on concrete mixers where abrasive dust demands a rigid double-rod mechanism that resists side loads and maintains a seal.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75 with the B04-SAID40X75
Replace the discontinued B04-SID40X75 directly with the SAID40X75, reusing the exact ISO 15552 mounting interface (Basic, FA, LB, TC) and G1/4 port without bracket changes. Size both ways by verifying the 528 N @0.5 MPa equal force is sufficient; if more push/pull is needed, step up to the 50 mm bore (825 N), or drop to the 32 mm bore (345 N) if lower. Choose a double-rod cylinder when you need anti-rotation stability or must drive two tools from one piston. This SKU has no -S magnet and cannot support sensing. For this 75 mm stroke, side-load is minimal, but for any stroke >=300 mm, ensure guide support to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X75
- ✓ 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-SID40X75 FAQ
Yes, the B04-SID40X75 (construction-machinery dedicated variant of SID40X75) is discontinued. The direct replacement is the SAID40X75. It shares the same ISO 15552 mounting, 40 mm bore, 75 mm stroke, G1/4 port, and equal both-ways force, while adding an upgraded piston seal.
Force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It uses a G1/4 port, a 16 mm rod, M12x1.25 thread, and 27 mm adjustable cushions. It has no -S magnet, so it cannot take a switch.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X75
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X75 replacement — usually within 7-8 hours.