Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 350mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke350 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S
The B04-SCD40X350S is an AirTAC construction-machinery dedicated double-rod cylinder, mechanically identical to the standard SCD40X350S. The B04- prefix simply designates its optimization for heavy-equipment builders. It features a 40mm bore and 350mm stroke, driven by a Ø16mm piston rod extending from both end caps.
Because the rod occupies both chambers, the effective area is identical in each direction, yielding an equal push and pull force of 739 N at 0.7 MPa. The built-in magnet (-S) allows CMSG or DMSG sensors to track piston position along the 191mm body length A(SCD). Adjustable cushions at both ends provide 21mm of end-of-stroke deceleration.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 350 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| 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 stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S Is Used
Excavator Linkages
Drives secondary articulation arms on heavy equipment where the B04- designation ensures suitability for rugged construction environments.
Shuttle Transfer
Moves parts across a machinery bed using both rod ends, ensuring identical speed and 739 N force in both directions.
Non-Rotating Pushers
The dual-rod design provides better resistance to twist than single-rod types, ideal for pushing heavy panels or molds.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S the Right Cylinder?
Choose this 40mm bore when an application demands 739 N of symmetrical thrust at 0.7 MPa. If your machine requires less force, stepping down to a 32mm bore yields 483 N; if more power is needed, a 50mm bore provides 1154 N. A single-rod SC cylinder is preferable if rear tooling or anti-rotation is unnecessary, while a true guided cylinder is required for heavy lateral loads.
With a 350mm stroke, the unsupported rod length increases susceptibility to bending under side loads; always use external guides or a linear rail to support the workpiece. To replace this unit, match the 40mm bore, 350mm stroke, PT1/4 port thread, basic mounting, and the -S magnet option.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X350S FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD40X350S. It is mechanically identical to the standard model, offering the same 40mm bore, 350mm stroke, and 739 N force.
A double-rod cylinder provides equal push and pull forces (739 N at 0.7 MPa) because the rod area is subtracted from both sides. It also offers better rod guidance, anti-rotation capability, and a rear rod for mounting sensors or tooling.
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