This model is discontinued
AirTAC has phased out the SU series. You can still order this code here: we ship the direct replacement B04-SAUD40X350S, 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-SUD40X350S
The AirTAC Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X350S is a double-acting profile-type standard cylinder with a Ø40mm bore and 350mm stroke, 1/4" air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAUD40X350S, which matches its bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port size1/4"
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAUD40X350S
- 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-SUD40X350S
The AirTAC B04-SUD40X350S is a double-acting, double-rod profile cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SUD40X350S, mechanically identical to it. A rod exits both ends of the extruded aluminium profile barrel on a single piston, meaning both faces use the rod-side area and push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It features a 16 mm rod, M12x1.25 rod thread, 1/4" port, and 21 mm adjustable air cushions at each end. This legacy model is discontinued and the direct replacement is the SAUD40X350S.
Because the rear rod can carry a sensor cam or drive a second tool simultaneously while resisting rotation, double-rod designs excel in compact heavy-equipment builds. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches; the SAUD replacement upgrades to current CMSG/DMSG/EMSG sensors. Note that a plain cylinder does not hold its load on air loss—the air cushion only decelerates near stroke end, so use an external rod lock for held loads.
Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X350S Technical Specifications
| Model | Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X350S |
|---|---|
| Series | SU profile-type cylinder (discontinued) |
| Replacement | B04-SAUD40X350S |
| Bore size | Ø40 mm |
| Stroke | 350 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-SAUD40X350S 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-SAUD40X350S 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-SUD40X350S
| SU | Profile-type standard cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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-SUD40X350S Is Used
Excavator Control Linkages
Equal-both-ways force and anti-rotation stability make this cylinder ideal for synchronized actuation of heavy-equipment control linkages where a compact profile body is required.
Dual-Tool Synchronized Drives
The double-rod design allows the rear rod to drive a secondary mechanism or carry a sensor cam simultaneously, useful in construction-machinery automated jigs and fixturing.
Replacing the Airtac B04-SUD Construction Machinery Special Standard Cylinder B04-SUD40X350S with the B04-SAUD40X350S
To replace this discontinued B04-SUD40X350S, use the direct replacement SAUD40X350S which retains the exact 40 mm bore, 350 mm stroke, 1/4" port, and FA/LB mounting compatibility with the AirTAC SC series. A double rod is the right choice when you need anti-rotation stability or must drive two tools from one piston. If upgrading, note the -S sensor change from legacy CS1-B/DS1-B to current CMSG/DMSG/EMSG. Finally, for this 350 mm stroke, external guides are recommended to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same bore / stroke → B04-SAUD40X350S
- ✓ 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-SUD40X350S FAQ
Yes, the B04-SUD40X350S is discontinued. The direct replacement is the SAUD40X350S. The B04- prefix simply marks it as the construction-machinery dedicated variant of the base SUD40X350S, and the SAUD retains the identical 40 mm bore, 350 mm stroke, 1/4" port, and FA/LB mounting.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The bore is 40 mm with a 1/4" port, a 16 mm rod, M12x1.25 rod thread, and 21 mm adjustable cushions.
Related AirTAC SAU Cylinders
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