This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X25, 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-SID40X25
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 25mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X25, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke25 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X25
- 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-SID40X25
The AirTAC B04-SID40X25 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 (528 N at 0.5 MPa). The B04- prefix marks this as the construction-machinery dedicated variant of the base SID40X25, mechanically identical to it. This SKU is discontinued and has no -S magnet, so it cannot take a magnetic switch. The direct replacement is the SAID40X25, sharing the same 40 mm bore, 25 mm stroke, G1/4 port, and M12x1.25 rod thread.
Because the rod-side area drives both faces, force is equal both ways (739 N at 0.7 MPa, 950 N at 0.9 MPa). The SAI replacement upgrades the piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The 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-SID40X25 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X25 |
| Bore size | Ø40 mm |
| Stroke | 25 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-SAID40X25 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-SAID40X25 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-SID40X25
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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-SID40X25 Is Used
Excavator Linkage
Equal push/pull force drives a synchronized linkage on heavy equipment without rod rotation.
Loader Gate
The back rod operates a secondary gate mechanism while the front rod shifts the main load.
Crusher Ejector
Double-rod symmetry ejects material from a crusher hopper with stable, equal force.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X25 with the B04-SAID40X25
To replace the B04-SID40X25, use the SAID40X25 direct: same ISO 15552 mounting interface, 40 mm bore, 25 mm stroke, and G1/4 port. Size both ways by checking neighbor bores (32 mm or 50 mm) while keeping the equal-both-ways force requirement. A double rod is right when you need anti-rotation or must drive two tools. Reuse FA, LB, or TC mounts. Since this SKU lacks the -S magnet, add external sensors if needed. For stroke >=300 mm, verify side-load limits. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X25
- ✓ 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-SID40X25 FAQ
Yes, the B04-SID40X25 is discontinued. The direct replacement is the SAID40X25. The B04- prefix denotes the construction-machinery dedicated variant of the base SID40X25, so the SAID40X25 matches its 40 mm bore, 25 mm stroke, G1/4 port, and ISO 15552 mounting interface perfectly.
Force is equal both ways: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa. Speed is 30-800 mm/s. It uses a G1/4 air port, M12x1.25 rod thread, and 27 mm adjustable air cushions at each end.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X25
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X25 replacement — usually within 7-8 hours.