Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S 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, 500mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke500 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S
The B04-SCD40X500S is an AirTAC double-acting, double-rod cylinder built for construction machinery. The B04- prefix marks it as a heavy-equipment dedicated variant, mechanically identical to the standard SCD40X500S. A through-rod protrudes from both end caps, yielding identical 739N push and pull force at 0.7 MPa.
Because the Ø16mm rod exits both ends, you gain superior anti-rotation control and symmetric bearing loading. The 500mm stroke falls within the 1200mm maximum for this bore. The barrel carries a built-in magnet (the S suffix) for CMSG/DMSG/EMSG sensor tracking, and adjustable cushions provide 21mm of end-of-stroke deceleration.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 500 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-SCD40X500S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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-SCD40X500S Is Used
Excavator Linkages
Drives synchronized positioning arms on heavy equipment where the rear rod operates a secondary mechanical stopper.
Shuttle Transfer Tables
Moves pallets back and forth on construction-machinery assembly lines, utilizing the equal push and pull thrust for consistent cycle times.
Non-Rotating Pushers
Indexes heavy components using the dual-end rod to prevent twisting, ensuring precise placement under high vibration.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X500S the Right Cylinder?
Choose this 40mm bore when an application demands 739N of thrust in both directions. If your machine needs less force, step down to the 32mm bore (345N at 0.5MPa); if you need more clamping power, step up to the 50mm bore (825N at 0.5MPa). A single-rod SC cylinder is preferable if rear tooling or equal thrust is unnecessary.
At 500mm stroke, the unsupported rod length increases susceptibility to bending under side loads. Use an external guide rail to prevent rod damage. To replace this unit, match the 40mm bore, 500mm stroke, PT1/4 port, basic mounting, and the -S magnet. Note that air cushions only decelerate the piston; they do not lock the load. A mechanical lock is required to hold position without live air pressure.
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-SCD40X500S FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated variant. It is mechanically identical to the standard SCD40X500S, offering the same 739N equal push/pull force at 0.7 MPa and built-in magnet.
A double-rod design provides identical push and pull forces (739N both ways here) and better anti-rotation resistance. It allows tooling or sensors to be mounted on the rear rod, which is ideal for symmetric heavy-equipment automation tasks.
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