This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X75S, 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-SID40X75S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75S 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-SAID40X75S, 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-SAID40X75S
- 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-SID40X75S
The B04-SID40X75S is an AirTAC double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID40X75S, 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. It features a 40 mm bore, G1/4 port, M12x1.25 rod thread, and 27 mm adjustable cushions. This SID model is discontinued; the direct replacement is the SAID40X75S, sharing the same 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 to two Y-shaped one-way elements for lower start-up pressure and longer life. 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 SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X75S |
| 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-SAID40X75S 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-SAID40X75S 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-SID40X75S
| 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-SID40X75S Is Used
Excavator Linkage Actuation
Drives secondary construction-machinery mechanisms where equal push/pull force and anti-rotation are critical for precise positioning of heavy-equipment components.
Synchronized Material Transfer
Uses both extending rods to push and pull simultaneously across a conveyor section, ensuring balanced load movement without single-rod force mismatch.
Dual-Tool Calibration Rig
Mounts a sensor cam on the back rod while the front rod drives a tool, leveraging the ISO 15552 interface for rigid construction-equipment testing frames.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X75S with the B04-SAID40X75S
To replace the discontinued B04-SID40X75S, use the SAID40X75S direct: it matches the 40 mm bore, 75 mm stroke, G1/4 port, M12x1.25 thread, and ISO 15552 mounting (Basic, FA, LB, TC). Size both ways by checking neighbor bores (32 mm or 50 mm) to ensure the equal both-ways force (528 N @0.5 MPa) fits your application. A double rod is right when you need anti-rotation, a back-rod sensor cam, or dual-tool driving. The -S magnet fits legacy CS1-B/DS1-B switches. For stroke lengths >=300 mm, verify side-load limits to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X75S
- ✓ 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-SID40X75S FAQ
Yes, the B04-SID40X75S (construction-machinery dedicated SID40X75S) is discontinued. The direct replacement is the SAID40X75S, which shares the same ISO 15552 interface, 40 mm bore, 75 mm stroke, G1/4 port, and mounting. The SAI family also adds upgraded piston seals and SAIL/BSAI lock variants.
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, M12x1.25 rod thread, and 27 mm adjustable cushions.
Related AirTAC SAI Cylinders
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