This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X125, 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-SID40X125
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X125
- 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-SID40X125
The AirTAC B04-SID40X125 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 AirTAC's construction-machinery dedicated variant of the SID40X125, mechanically identical to the base model with a 16 mm rod, G1/4 port, and M12x1.25 thread. This SID model is discontinued; the direct replacement is the SAID40X125, which reuses the exact ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because the rear rod can carry a sensor cam or drive a second tool while resisting rotation, the double-rod layout is highly effective for heavy-equipment builders. Note this non-magnetic SKU cannot take a switch, and the air cushion only decelerates near stroke end; it does not hold loads on air loss, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X125 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X125 |
| Bore size | Ø40 mm |
| Stroke | 125 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-SAID40X125 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-SAID40X125 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-SID40X125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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-SID40X125 Is Used
Excavator Linkage Control
Equal push/pull force drives synchronized actuation links on heavy equipment, preventing sag and ensuring precise positioning under varying hydraulic pressures.
Crane Load Stabilizer
The rear rod drives a secondary mechanical stop while the front rod handles the primary load, providing rigid anti-rotation stability for lifted components.
Pneumatic Brake Cam
Dual rods carry a cam mechanism on one end and a mounting bracket on the other, maintaining balanced tension and reliable deceleration for mobile machinery.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X125 with the B04-SAID40X125
To replace the discontinued B04-SID40X125, swap in the SAID40X125 directly—it matches the 125 mm stroke, 528 N equal-both-ways force, G1/4 port, and FA/LB/TC mounting footprint. When sizing both ways, verify if neighbouring bores (like the 32 mm or 50 mm) offer a better force fit, but the 40 mm bore provides a balanced 950 N maximum output. Choose a double-rod cylinder when you need anti-rotation stability or synchronous driving of two tools. Since this SKU lacks the -S magnet, it cannot support sensing; if sensing is required, select a -S model. For this 125 mm stroke, side-load alignment is generally manageable, but for any stroke >=300 mm, carefully support the rod to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X125
- ✓ 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-SID40X125 FAQ
Yes, the B04-SID40X125 is discontinued. The direct replacement is the SAID40X125. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SID40X125, so the SAID40X125 matches it mechanically, retaining the same ISO 15552 interface, G1/4 port, and 125 mm stroke.
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, a 16 mm rod, and an M12x1.25 rod thread. Operating pressure is 0.15-1.0 MPa, with an adjustable 27 mm cushion at each end.
Related AirTAC SAI Cylinders
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