This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAUD40X500 — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAUD40X500 in place of this model. The SAU replacement uses the same profile body, bore, stroke, force and SC-series mounting. It moves to the current CMSG / DMSG / EMSG sensor switches (the SU used CS1-B / DS1-B) and adds the SAUF valve-integrated option.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 is a double-acting profile-type standard cylinder with a Ø40mm bore and 500mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAUD40X500, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke500 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAUD40X500
About the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500
The AirTAC B04-SUD40X500 is a double-acting, double-rod profile cylinder where a rod exits both ends on one piston, 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 SUD40X500, mechanically identical to the base model with a 40 mm bore, 500 mm stroke, 1/4" port, and M12x1.25 rod thread. This discontinued profile barrel is shorter than an ISO 15552 cylinder of the same bore and uses adjustable 21 mm air cushions at each end.
Because the second rod acts as an anti-rotation guide and can drive a second tool simultaneously, it is ideal for heavy-equipment builders. This SKU has no magnet and cannot take a sensor. The drop-in replacement is the SAUD40X500, which retains the exact FA/LB mounting, force, and 1/4" port, but upgrades sensing to current CMSG/DMSG/EMSG switches (the SUD used legacy CS1-B/DS1-B). Based on the 528 N @0.5 MPa figure, the safe working load is about 317 N, yielding a vertical lift capacity of roughly 27 kg with a 2:1 margin.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD40X500 |
| Bore size | Ø40 mm |
| Stroke | 500 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| 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, 21 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SU datasheet (now discontinued). The B04-SAUD40X500 carries the same 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-SAUD40X500 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-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SU-family variants: SUD (double rod), SUJ (adjustable stroke) — each maps to its SAU equivalent (SUD→SAUD, SUJ→SAUJ). The current SAU line adds the SAUF valve-integrated option.
Where the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 Is Used
Excavator Linkage Actuation
Drives synchronized dual-tool operations on construction machinery where the equal both ways force and anti-rotation properties of the second rod handle heavy offset loads safely.
Crane Boom Extension
Provides stable push and pull movements in heavy-equipment frames, using the double-rod design to maintain alignment and prevent twisting during 500 mm travel.
Concrete Pump Positioning
Shifts diverter gates on construction sites, relying on the compact profile barrel and 1/4" port to fit tight machinery spaces while delivering 950 N @0.9 MPa.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 with the B04-SAUD40X500
To replace the discontinued B04-SUD40X500, order the SAUD40X500 drop-in upgrade, which matches the 40 mm bore, 500 mm stroke, 1/4" port, and FA/LB mounting exactly. Size both ways by checking the equal push/pull force against neighbour bores: if less force is needed, step down to the 32 mm bore (345 N @0.5 MPa); if more is required, step up to the 50 mm bore (825 N @0.5 MPa). Choose a double-rod cylinder when you need anti-rotation stability or must drive two tools from one piston. Because this SKU lacks a magnet (-S), it cannot support sensors; if sensing is required on the SAUD replacement, specify the -S option and use CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. For this 500 mm stroke, external guides are recommended to prevent rod bending and manage side loads. A plain cylinder does not hold loads on air loss—the cushion only decelerates near stroke end—so use an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD40X500
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S): sensor family CS1-B → CMSG
- ✓ Mounting reused (FA/FB/CA/CB/LB)
- ✓ Need a built-in valve? → SAUF
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X500 FAQ
Yes, the B04-SUD40X500 is discontinued. The exact drop-in replacement is the SAUD40X500, which shares the same 40 mm bore, 500 mm stroke, equal both ways force, 1/4" port, and FA/LB mounting. The B04- prefix simply marks it as the construction-machinery dedicated variant of the SUD40X500. The SAUD upgrades sensing to CMSG/DMSG/EMSG sensors (the SUD used CS1-B/DS1-B).
The 40 mm bore double-rod design provides equal force both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The air port is 1/4" with an M12x1.25 rod thread. It operates at 0.15-1.0 MPa with adjustable 21 mm cushions at each end, yielding a safe working load of roughly 317 N and a vertical lift of about 27 kg with a 2:1 margin.
Related AirTAC SAU Cylinders
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