This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAUD40X400 — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAUD40X400 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-SUD40X400
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X400 is a double-acting profile-type standard cylinder with a Ø40mm bore and 400mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAUD40X400, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAUD40X400
About the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X400
The AirTAC B04-SUD40X400 is a double-acting, double-rod profile cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SUD40X400, mechanically identical in every spec. A rod exits both ends on a single piston, meaning push and pull force is equal both ways at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It features a 40 mm bore, 1/4" port, M12x1.25 rod thread, and 21 mm adjustable cushions. This SKU has no magnet (-S omitted) and cannot take a magnetic switch.
This discontinued profile cylinder is replaced by the drop-in SAUD40X400, which shares the exact bore, stroke, force, port, and FA/LB mounting. The double-rod design drives two tools simultaneously and prevents piston rotation. For buyers, the computed safe working load is ~317 N (60% of 528 N), yielding a ~27 kg vertical lift with a 2:1 margin. Note that air cushions only decelerate near stroke end; an external rod lock is required for load holding on air loss.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X400 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X400 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD40X400 |
| Bore size | Ø40 mm |
| Stroke | 400 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-SAUD40X400 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-SAUD40X400 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-SUD40X400
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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-SUD40X400 Is Used
Excavator Linkage
Equal both ways force actuates dual locking pins on heavy equipment arms without rotational play.
Crusher Feed Gates
Drives two opposing chutes simultaneously to regulate aggregate flow in harsh material handling.
Drilling Rig Indexing
The through-rod design provides stable, anti-rotation tool changing for track-mounted drill heads.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X400 with the B04-SAUD40X400
To replace the discontinued B04-SUD40X400, use the drop-in SAUD40X400, which retains the 40 mm bore, 400 mm stroke, 1/4" port, and equal-both-ways force. When sizing both ways, verify your load against the 528 N @0.5 MPa output, or step up to the 50 mm bore (825 N) if more force is needed. A double rod is right when driving two tools or requiring anti-rotation. Mounting is limited to Basic, FA, and LB (SC-series compatible only). As this non-magnetic SKU lacks a sensor cam, the SAUD upgrade path uses CMSG/DMSG/EMSG sensors if you add the -S option. For this 400 mm stroke, external guides are recommended to prevent rod bending under side loads.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD40X400
- ✓ 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-SUD40X400 FAQ
Yes, the B04-SUD40X400 (construction-machinery dedicated SUD40X400) is discontinued. The exact drop-in replacement is the SAUD40X400, which matches the 40 mm bore, 400 mm stroke, 1/4" port, and equal both ways force. The SAUD uses current CMSG/DMSG/EMSG sensors if you specify the -S magnet option.
Force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The computed safe working load is ~317 N (60% of 528 N), allowing a ~27 kg vertical lift with a 2:1 margin. Air cushions only decelerate the piston; a plain cylinder drifts on air loss, so use an external rod lock for load holding.
Related AirTAC SAU Cylinders
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