This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAUD40X50 — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAUD40X50 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-SUD40X50
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X50 is a double-acting profile-type standard cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAUD40X50, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAUD40X50
About the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X50
The AirTAC B04-SUD40X50 is a double-acting, double-rod profile cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SUD40X50, mechanically identical in every spec. A rod exits both ends on a single piston, meaning push and pull force are equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The extruded aluminum profile barrel is more compact than an ISO 15552 cylinder of the same 40mm bore. This discontinued model features a 16mm rod, M12x1.25 rod thread, 21mm adjustable cushions, and a 1/4" port.
This SUD series is discontinued and the exact drop-in replacement is the SAUD40X50, preserving the bore, stroke, equal force, port, and FA/LB mounting. The double-rod design prevents rotation and allows driving two tools simultaneously. For sizing, a safe working load is roughly 317 N (60% of the 528 N @0.5 MPa force), yielding a vertical lift capacity of about 27 kg with a 2:1 margin. Note this non-magnetic SKU cannot take a sensor, and while cushions decelerate near stroke end, an external rod lock is required for load holding.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X50 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X50 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD40X50 |
| Bore size | Ø40 mm |
| Stroke | 50 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-SAUD40X50 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-SAUD40X50 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-SUD40X50
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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-SUD40X50 Is Used
Excavator Linkage
Synchronizes dual actuation points on heavy equipment cabins where equal push and pull force prevents linkage binding.
Loader Material Diverter
Drives a two-sided diverter gate on aggregate conveyors, utilizing the dual rods to move counterweights without rotation.
Crane Gripper Jaws
Powers opposing gripper jaws on lifting attachments, using the equal both ways force to maintain balanced clamping pressure.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X50 with the B04-SAUD40X50
To replace the discontinued B04-SUD40X50, drop in the SAUD40X50 which matches the 40mm bore, 50mm stroke, 1/4" port, and equal-both-ways force. If sizing both ways, neighboring bores (32mm or 50mm) offer 345 N or 825 N @0.5 MPa respectively, but this 40mm provides 528 N. A double rod is right when you need anti-rotation or to drive two tools. Mounting uses FA or LB brackets (SC-series compatible only). Because this SKU lacks the -S magnet, it cannot use legacy CS1-B/DS1-B sensors, and the SAUD upgrade uses current CMSG/DMSG/EMSG sensors. For strokes >=300, verify the side-load rating. A plain cylinder drifts on air loss, so add an external rod lock for held loads.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD40X50
- ✓ 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-SUD40X50 FAQ
Yes, the B04-SUD40X50 (construction-machinery dedicated SUD40X50) is discontinued. The exact drop-in replacement is the SAUD40X50, which matches the 40mm bore, 50mm stroke, 1/4" port, and FA/LB mounting.
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 air port is 1/4". The safe working load is ~317 N, allowing a ~27 kg vertical lift with a 2:1 margin.
Related AirTAC SAU Cylinders
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