This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement B04-SAUD40X225S, with the same bore, stroke, output force, port and mounting, so it fits the same application. 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-SUD40X225S
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S is a double-acting profile-type standard cylinder with a Ø40mm bore and 225mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAUD40X225S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke225 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAUD40X225S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S
The AirTAC B04-SUD40X225S is a double-acting, double-rod profile cylinder where a rod exits both ends on one piston, yielding equal push and pull force of 528N at 0.5MPa. The B04- prefix marks this as a construction-machinery dedicated variant of the base SUD40X225S, mechanically identical with a 40mm bore, 225mm stroke, 1/4" port, and M12x1.25 rod thread. This legacy SUD series is discontinued; the direct replacement is the SAUD40X225S, retaining the exact bore, stroke, and FA/LB mounting.
Because both faces use the rod-side area, the cylinder provides anti-rotation stability and can drive two tools simultaneously. The extruded aluminum profile barrel is more compact than an ISO 15552 cylinder. Note that the SAUD upgrade transitions from legacy CS1-B/DS1-B switches to current CMSG/DMSG/EMSG sensors.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD40X225S |
| Bore size | Ø40 mm |
| Stroke | 225 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-SAUD40X225S 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-SAUD40X225S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×225 | 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-SUD40X225S Is Used
Excavator Door Control
Uses equal both-ways force to reliably open and close heavy cab doors on construction machinery without sagging.
Dual-Tool Actuation
Drives two opposing mechanical linkages simultaneously from a single compact profile body for synchronized gripping.
Anti-Rotation Guide
Prevents piston rod twist in heavy-equipment positioning tasks where a single rod would bind under offset loads.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X225S with the B04-SAUD40X225S
To replace the discontinued B04-SUD40X225S, order the SAUD40X225S direct equivalent, which matches the 40mm bore, 225mm stroke, 1/4" port, and FA/LB mounting. Because force is equal both ways, sizing is straightforward: verify the 528N (@0.5MPa) requirement fits your load, or step up to the 50mm bore (825N) if more force is needed. A double-rod design is ideal when you need anti-rotation stability or must drive two mechanisms from one cylinder. For the -S magnet option, the SAUD uses CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B. At 225mm stroke (under 300mm), side-load leverage is minimal, but always ensure rigid FA/LB mounting. For load-holding during air loss, add an external rod lock, as cushions only decelerate.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD40X225S
- ✓ 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-SUD40X225S FAQ
Yes, the B04-SUD40X225S is discontinued. The direct replacement is the SAUD40X225S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SUD40X225S. The SAUD keeps the same 40mm bore, 225mm stroke, 1/4" port, and FA/LB mounting, but uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B.
Because it is a double-rod cylinder, force is equal both ways: 528N at 0.5MPa, 739N at 0.7MPa, and 950N at 0.9MPa. The bore is 40mm with a 1/4" port, a 16mm rod, and an M12x1.25 rod thread.
Related AirTAC SAU Cylinders
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