This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement B04-SAUD50X225, 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-SUD50X225
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X225 is a double-acting profile-type standard cylinder with a Ø50mm bore and 225mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAUD50X225, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke225 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAUD50X225
- 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-SUD50X225
The AirTAC B04-SUD50X225 is a double-acting, double-rod profile cylinder where the B04- prefix designates it as a construction-machinery dedicated variant of the base SUD50X225, mechanically identical to the standard model. Because a rod exits both ends on a single piston, both faces use the rod-side area, yielding equal push and pull force of 825 N at 0.5 MPa. The extruded aluminium profile barrel is more compact than an ISO 15552 cylinder of the same bore. This discontinued model uses a 1/4" port, M16x1.5 rod thread, and 21 mm adjustable cushions at each end.
As the SUD series is discontinued, the direct replacement is the SAUD50X225, which retains the same bore, stroke, equal-both-ways force, port, and FA/LB mounting. The SAUD upgrade uses current CMSG/DMSG/EMSG sensors instead of the legacy CS1-B/DS1-B switches used here, and also offers the SAUF built-in-valve variant. Note that this specific SKU lacks a magnet and cannot take a magnetic switch.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X225 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X225 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD50X225 |
| Bore size | Ø50 mm |
| Stroke | 225 mm |
| Acting type | Double acting |
| Port size | 1/4" |
| Rod thread | M16×1.5 |
| 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-SAUD50X225 carries the same ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The B04-SAUD50X225 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-SUD50X225
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | 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-SUD50X225 Is Used
Excavator Linkage Actuation
Drives secondary construction machinery mechanisms where equal push/pull force is required to move linkage components smoothly in both directions without rotational drift.
Heavy Equipment Material Transfer
Pushes and pulls heavy-duty transfer arms on construction site material handling systems, utilizing the dual rods to maintain strict alignment under offset loads.
Synchronized Tool Driving
Operates two separate mechanisms simultaneously from one piston, using the rod protruding from both ends to actuate clamping and positioning tools on heavy machinery assemblies.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X225 with the B04-SAUD50X225
To replace the B04-SUD50X225, order the SAUD50X225, which is a direct upgrade keeping the 50 mm bore, 225 mm stroke, 1/4" port, and FA/LB mounting. When sizing both ways, verify the equal-both-ways force fits your needs: the 50 mm bore delivers 825 N at 0.5 MPa, while the neighbouring 40 mm bore provides 528 N and the 63 mm bore provides 1402 N. Choose a double-rod cylinder when you need anti-rotation stability, or when the back rod must carry a sensor cam or drive a second tool simultaneously. Since this SKU has no magnet, you cannot mount sensors; the SAUD replacement with a -S suffix is required for CMSG/DMSG/EMSG sensing. For strokes of 300 mm or longer, carefully manage side-load alignment to prevent guide wear. A plain cylinder cannot hold a load on air loss—the cushion only decelerates near stroke end—so use an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD50X225
- ✓ 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-SUD50X225 FAQ
Yes, the B04-SUD50X225 is discontinued. The direct replacement is the SAUD50X225, which shares the same 50 mm bore, 225 mm stroke, 1/4" port, and FA/LB mounting. The B04- prefix simply marks it as a construction-machinery dedicated variant of the base SUD50X225, so all physical specifications remain identical.
Because it is a double-rod cylinder, the force is equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The air port size is 1/4".
Related AirTAC SAU Cylinders
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