This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X150S, 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-SID40X150S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X150S
- 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-SID40X150S
The AirTAC B04-SID40X150S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston, ensuring push and pull force are 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 SID40X150S, mechanically identical to the base model with a 40mm bore, 150mm stroke, 16mm rod, and G1/4 port. This SID model is discontinued and end-of-life.
The direct replacement is the SAID40X150S, which reuses the same ISO 15552 mounting interface, bore, stroke, and force. The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. 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-SID40X150S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X150S |
| Bore size | Ø40 mm |
| Stroke | 150 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-SAID40X150S 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-SAID40X150S 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-SID40X150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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-SID40X150S Is Used
Excavator Linkage Actuation
Drives secondary construction-machinery linkages where equal push and pull force is required for precise positioning of heavy-equipment components.
Crusher Feed Diversion
Uses the double-rod design to divert aggregate flow on construction-site conveyors, ensuring stable two-way operation without rotational drift.
Loader Attachment Sync
Synchronizes loader attachment movements where the rear rod end simultaneously carries a sensor cam to track fork positioning in harsh environments.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X150S with the B04-SAID40X150S
To replace the discontinued B04-SID40X150S, select the SAID40X150S, which is a direct upgrade retaining the exact ISO 15552 mounting interface, 40mm bore, 150mm stroke, G1/4 port, and equal-both-ways force. When sizing both ways, verify that 528 N @0.5 MPa (or 739 N @0.7 MPa) meets your push and pull requirements, or step to neighbouring bores like 32mm or 50mm if you need less or more force. A double-rod design is right when you need equal force in both directions, anti-rotation stability, or a back rod to carry a sensor cam. You can reuse FA, LB, or TC mounts. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches (the SAI replacement uses current AirTAC switches). For this 150mm stroke, side-load is minimal, but for any stroke >=300mm, ensure proper guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X150S
- ✓ 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-SID40X150S FAQ
Yes, the B04-SID40X150S is discontinued. The direct replacement is the SAID40X150S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X150S, and the SAID replacement is mechanically identical with the same ISO 15552 mounting interface, bore, stroke, G1/4 port, and force. The SAI family also adds upgraded piston seals and SAIL/BSAI lock variants.
Because it is a double-rod cylinder, the force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40mm with a G1/4 air port, a 16mm piston rod, and an M12x1.25 rod-end thread. Note that the air cushion only decelerates near stroke end; it does not hold loads on air loss.
Related AirTAC SAI Cylinders
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