This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X250, 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-SID40X250
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X250
- 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-SID40X250
The AirTAC B04-SID40X250 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, 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 a construction-machinery dedicated variant, mechanically identical to the standard SID40X250 with a 40 mm bore, 250 mm stroke, G1/4 port, and M12x1.25 rod thread. This legacy SID series is discontinued.
The direct replacement is the SAID40X250, which reuses the same ISO 15552 mounting interface and adjustable 27 mm cushions. The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure and long life.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X250 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X250 |
| Bore size | Ø40 mm |
| Stroke | 250 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-SAID40X250 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-SAID40X250 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-SID40X250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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-SID40X250 Is Used
Excavator Linkage Control
Equal push/pull force drives dual-action mechanical linkages on heavy equipment without the stroke drift of single-rod pull phases.
Loader Transfer Gates
The second rod provides anti-rotation stability for routing aggregates on construction sites, ensuring precise gate alignment under vibration.
Crusher Tool Actuation
The rear rod extension drives a secondary tool or mechanical stop simultaneously, synchronizing heavy machinery jaw movements.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X250 with the B04-SAID40X250
To replace the discontinued B04-SID40X250, select the SAID40X250 direct upgrade, matching the 40 mm bore, 250 mm stroke, and G1/4 port. Size both directions by checking neighbour bores (32 mm or 50 mm) against your equal-both-ways force needs. A double-rod design is right when you need anti-rotation stability or a back rod to carry a sensor cam. Mounting options include FA, LB, and TC brackets. This SKU lacks the -S magnet and cannot take a sensor. For strokes of 300 mm or longer, account for side-load moments. Note that air cushions only decelerate; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X250
- ✓ 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-SID40X250 FAQ
Yes, the B04-SID40X250 (construction-machinery dedicated SID40X250) is discontinued. The direct replacement is the SAID40X250, which shares the identical ISO 15552 interface, bore, stroke, and G1/4 port.
Force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. Cushions only decelerate; use an external rod lock for load holding.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X250
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID40X250 replacement — usually within 7-8 hours.