This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement B04-SAUD50X300, 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-SUD50X300
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X300 is a double-acting profile-type standard cylinder with a Ø50mm bore and 300mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAUD50X300, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAUD50X300
- 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-SUD50X300
The B04-SUD50X300 is a double-acting, double-rod profile cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SUD50X300, sharing identical specifications. A rod exits both ends on one piston, meaning both faces use the rod-side area and push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The extruded aluminium profile barrel is shorter than an ISO 15552 cylinder of the same bore. This SUD model is discontinued and the direct replacement is the SAUD50X300, retaining the 50mm bore, 300mm stroke, 1/4" port, and FA/LB mounting.
Because the second rod drives a sensor cam or a second tool while resisting rotation, double-rod architecture provides superior anti-rotation stability. Note this non-magnetic SKU cannot take a switch. The 21mm adjustable air cushion only decelerates the piston near stroke end; it does not hold loads on air loss, requiring an external rod lock for held loads.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X300 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X300 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD50X300 |
| Bore size | Ø50 mm |
| Stroke | 300 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-SAUD50X300 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-SAUD50X300 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-SUD50X300
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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-SUD50X300 Is Used
Excavator Linkage Actuation
Drives dual-tool mechanisms on heavy-equipment builds where equal push and pull force is required to pivot construction machinery linkages without rotational deflection.
Crusher Feed Control
Regulates material flow on construction-site crushers, using the back rod to mechanically signal valve position while maintaining consistent clamping pressure both ways.
Sliding Cabin Door Mechanism
Actuates heavy access panels on mobile plant equipment, leveraging the double-rod profile to prevent twist and ensure smooth, balanced travel across the 300mm stroke.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X300 with the B04-SAUD50X300
To replace the discontinued B04-SUD50X300, order the SAUD50X300 direct: it preserves the 50mm bore, 300mm stroke, equal-both-ways force, 1/4" port, and FA/LB mounting. When sizing both ways, verify your force requirements against the 825 N @0.5 MPa output, stepping up to the 63mm bore if higher thrust is needed, or down to the 40mm bore if lower force suffices. 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. Because this SKU lacks a magnet (-S), it cannot support legacy CS1-B/DS1-B switches, but the SAUD replacement accepts current CMSG/DMSG/EMSG sensors. For this 300mm stroke, external guides are recommended to prevent rod bending under side loads. Remember that a plain cylinder drifts on air loss; use an external rod lock or pilot-operated check valve for load holding.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD50X300
- ✓ 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-SUD50X300 FAQ
Yes, the B04-SUD50X300 is discontinued. The B04- prefix marks it as the construction-machinery dedicated variant of the base SUD50X300. The direct replacement is the SAUD50X300, which matches the 50mm bore, 300mm stroke, 1/4" port, and FA/LB mounting. The SAUD also offers the SAUF built-in-valve variant the SU line lacked.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is 1/4".
Related AirTAC SAU Cylinders
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