This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAIJ32X250-50S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAIJ32X250-50S 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-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S
The AirTAC Airtac B04-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø32mm bore and 250mm stroke, G1/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAIJ32X250-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ32 mm
- Stroke250 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- StatusDiscontinued → B04-SAIJ32X250-50S
About the Airtac B04-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S
The AirTAC B04-SIJ32X250-50S is a double-acting single-rod adjustable-stroke ISO 15552 cylinder. The B04- prefix marks it as a construction-machinery dedicated variant, mechanically identical to the base SIJ32X250-50S. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 200-250 mm window. The 32 mm bore uses a G1/8 port and M10x1.25 rod thread, delivering 402 N push and 345 N pull at 0.5 MPa.
This SIJ model is discontinued; the exact drop-in replacement is the SAIJ32X250-50S, retaining the same ISO 15552 mounting interface, force, and adjust window. The SAIJ upgrade features a two Y-shaped one-way piston seal for lower start-up pressure and longer life. Computed buyer insight: safe working load is roughly 241 N (60% of the 0.5 MPa push), yielding a 20 kg vertical lift capacity with a 2:1 margin. Note the stop screw sets end position only; it is not a load lock.
Airtac B04-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S Technical Specifications
| Model | Airtac B04-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAIJ32X250-50S |
| Bore size | Ø32 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| 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 1000 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAIJ32X250-50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø32mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 402 N | 346 N |
| 0.7 MPa | 563 N | — |
| Max (@1.0 MPa) | 82 kgf | |
The B04-SAIJ32X250-50S 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-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 32 | 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-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S Is Used
Excavator Panel Positioning
Field-tunes the extend stroke on heavy-equipment access doors, allowing on-site adjustment of the 50 mm window to accommodate varying panel tolerances without changing the cylinder.
Crane Component Actuation
Provides adjustable end-positioning for locking pins on construction cranes, trimming the extend stroke by up to 50 mm to align with structural variations during assembly.
Concrete Pump Valve Control
Handles flow diversion on concrete machinery where exact stroke endpoints must be dialed in on-site, using the external stop screw to set the precise 200-250 mm extension.
Replacing the Airtac B04-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S with the B04-SAIJ32X250-50S
To replace the discontinued B04-SIJ32X250-50S, order the drop-in SAIJ32X250-50S, which preserves the 32 mm bore, 250 mm nominal stroke, 50 mm adjust window, G1/8 port, and -S magnet. When sizing both ways, the neighboring 40 mm bore provides 628 N push at 0.5 MPa if more force is needed, while the 32 mm bore itself offers 402 N push at 0.5 MPa. Select the 50 mm adjust window if your construction mechanism requires field-tuning the extend stroke between 200 and 250 mm. Mounting options include FA, LB, and TC brackets. The -S suffix indicates a piston magnet for legacy CS1-B/DS1-B switches. For strokes of 300 mm or longer, verify side-load constraints to prevent guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAIJ32X250-50S
- ✓ 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-SIJ Construction Machinery Special ISO Standard Cylinder B04-SIJ32X250-50S FAQ
Yes, the AirTAC B04-SIJ32X250-50S is discontinued. The B04- prefix designates it as the construction-machinery dedicated variant of the base SIJ32X250-50S. The exact drop-in replacement is the SAIJ32X250-50S, which shares the identical ISO 15552 interface, 32 mm bore, 250 mm stroke, 50 mm adjust window, and G1/8 port.
The 32 mm bore delivers 402 N push and 345 N pull at 0.5 MPa, 563 N push at 0.7 MPa, 724 N push at 0.9 MPa, and a theoretical max of 82 kgf at 1.0 MPa. The external stop screw provides a 50 mm adjust window, allowing the extend stroke to be shortened from the 250 mm maximum down to 200 mm on-site. The stop sets end position only and does not hold the load on air loss.
Related AirTAC SAI Cylinders
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