This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI63X50 — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI63X50 in place of this model. 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-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø63mm bore and 50mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI63X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ63 mm
- Stroke50 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAI63X50
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50
The AirTAC B04-SI63X50 is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the SI63X50, mechanically identical to the base model. Delivering 1559 N push force at 0.5 MPa, it is replaced by the SAI63X50. This drop-in upgrade shares the exact same ISO 15552 mounting interface, 63 mm bore, 50 mm stroke, G3/8 port and M16x1.5 rod thread.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because this specific SKU lacks the -S magnet, it cannot accept a CS1-B/DS1-B sensor. For sizing, a safe working load is roughly 935 N (60% of the 0.5 MPa push force), equating to a vertical lift of about 79 kg with a 2:1 margin.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI63X50 |
| Bore size | Ø63 mm |
| Stroke | 50 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAI63X50 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 kgf | |
The B04-SAI63X50 produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 63 | Bore size in mm. |
| ×50 | 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-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 Is Used
Excavator Door Latches
Actuates heavy cab doors on earthmoving equipment, utilizing the 1559 N push force to secure panels against vibration and harsh site conditions.
Loader Linkage Stops
Provides a robust 50 mm stroke mechanical stop for auxiliary linkage positioning on front-end loaders, fitting seamlessly into ISO 15552 fixture mounts.
Crane Outrigger Pins
Deploys and retracts locking pins for mobile crane outriggers, where the 935 N safe working load ensures reliable mechanical engagement.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 with the B04-SAI63X50
To replace the B04-SI63X50, order the SAI63X50. Confirm the ISO 15552 mounting interface, 63 mm bore, 50 mm stroke, G3/8 port (PT/G/NPT thread) and mounting accessory. This no-S SKU cannot take a magnetic switch; if sensing is needed, select an SAI63X50S. For sizing alternatives, a 50 mm bore yields 982 N push @0.5 MPa, while an 80 mm bore yields 2513 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding on construction equipment, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI63X50
- ✓ 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-SI Construction Machinery Special ISO Standard Cylinder B04-SI63X50 FAQ
Yes, the B04-SI63X50 (the construction-machinery dedicated variant of SI63X50) is discontinued. The exact drop-in replacement is the SAI63X50. It is dimensionally interchangeable per ISO 15552, retaining the same 63 mm bore, 50 mm stroke, G3/8 port and mounting interface.
The 63 mm bore features a G3/8 air port and M16x1.5 rod thread. It delivers 1559 N push and 1402 N pull at 0.5 MPa, 2182 N push at 0.7 MPa, 2805 N push at 0.9 MPa, and a theoretical max force of 318 kgf at 1.0 MPa. Speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAI63X50
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