This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement B04-SAUD50X900, 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-SUD50X900
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X900 is a double-acting profile-type standard cylinder with a Ø50mm bore and 900mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAUD50X900, which matches its bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke900 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAUD50X900
- 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-SUD50X900
The AirTAC B04-SUD50X900 is a double-acting, double-rod profile cylinder where the B04- prefix marks it as a construction-machinery dedicated variant, mechanically identical to the standard SUD50X900. Because a rod exits both ends on the same piston, the push and pull forces are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The extruded aluminum profile barrel is shorter than an ISO 15552 cylinder of the same bore. This model uses a 1/4 inch port and a M16x1.5 rod thread.
This SUD series is discontinued and the direct replacement is the SAUD50X900, retaining the 50mm bore, 900mm stroke, 1/4 inch port, and FA/LB mounting. The SAUD upgrades to current CMSG/DMSG/EMSG sensors, whereas this legacy model used CS1-B/DS1-B switches. Note that this specific SKU lacks a magnet (-S) and cannot take a magnetic switch.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X900 Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X900 |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD50X900 |
| Bore size | Ø50 mm |
| Stroke | 900 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-SAUD50X900 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-SAUD50X900 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-SUD50X900
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×900 | 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-SUD50X900 Is Used
Excavator Panel Pusher
Drives opposing forming tools on heavy-equipment cabins with equal both-ways force, using the back rod as an anti-rotation guide.
Crusher Gate Sync
Opens and closes material discharge gates on construction crushers, relying on the compact profile barrel to fit tight chassis frames.
Loader Arm Stopper
Acts as a dual-ended mechanical stopper for loader arm alignment, providing 42 kg of vertical lift margin at 0.5 MPa.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD50X900 with the B04-SAUD50X900
To replace this discontinued cylinder, use the SAUD50X900 direct, which matches the 50mm bore, 900mm stroke, and 1/4 inch port. When sizing both ways, verify the equal push/pull force against neighbor bores (40mm or 63mm) to ensure the 825 N @0.5 MPa baseline fits your system. A double rod is right when you need anti-rotation stability or need to drive two tools from one piston. Mounting is limited to Basic, FA, and LB (SC-series compatible only). Because this SKU has no magnet, you cannot mount sensors; the SAUD upgrade uses CMSG/DMSG/EMSG sensors. For the 900mm stroke, external guides are mandatory to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD50X900
- ✓ 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-SUD50X900 FAQ
Yes, the B04-SUD50X900 is discontinued. The B04- prefix marks it as a construction-machinery dedicated variant of the base SUD50X900. The direct replacement is the SAUD50X900, which shares the same 50mm bore, 900mm stroke, 1/4 inch port, and FA/LB mounting.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This SKU lacks a magnet and cannot take a magnetic switch. The air cushion only decelerates near stroke end; it does not hold the load on air loss, so an external rod lock is required for held loads.
Related AirTAC SAU Cylinders
Request a Quote for the B04-SAUD50X900
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAUD50X900 replacement — usually within 7-8 hours.