Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S 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, 150mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke150 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S
The B04-SCD40X150S is an AirTAC double-acting, double-rod pneumatic cylinder engineered for construction machinery. The B04- prefix designates this as a construction-machinery dedicated variant, mechanically identical to the standard SCD40X150S. Its through-rod design yields identical push and pull thrust of 528 N at 0.5 MPa and 950 N at the 0.9 MPa maximum operating pressure.
Because the Ø16 mm piston rod exits both end caps, the effective pressure area remains balanced in both directions. This 150 mm stroke unit includes an adjustable cushion (21 mm) to decelerate the piston near the ends and features a built-in magnet (the S suffix) for mounting CMSG or DMSG sensors. It uses a PT1/4 port and has a body length A of 191 mm.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 150 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-SCD40X150S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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-SCD40X150S Is Used
Excavator Control Linkages
Provides equal bidirectional force for moving heavy control gates or linkages on construction equipment, where the rear rod can simultaneously operate a secondary return mechanism.
Shuttle Transfer Tables
Drives materials back and forth on heavy machinery transfer lines. The symmetric thrust ensures consistent cycle times in both directions without speed variation.
Non-Rotating Tooling Pushers
The dual-rod configuration offers better rod guidance and anti-rotation characteristics than single-rod types, making it suitable for pushing or positioning components on assembly jigs.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X150S the Right Cylinder?
Select this 40 mm bore when an application demands equal force in both directions, offering 528 N each way at 0.5 MPa. If your mechanism only requires thrust from one side, the single-rod AirTAC SC40X150S is a lighter, more compact alternative. For loads requiring high side-load resistance, a dedicated guided cylinder is recommended over a through-rod model.
When replacing this cylinder, match five points: 40 mm bore, 150 mm stroke, PT1/4 port thread, basic mounting (no bracket), and the built-in magnet. At 150 mm stroke, side-load on the unsupported rod is moderate, but external guides should be used if the load is heavy or off-center to prevent premature seal wear.
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-SCD40X150S FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated cylinder. It is mechanically identical to the standard SCD40X150S, offering the same 40 mm bore, 150 mm stroke, and 950 N force at 0.9 MPa, but is designated for heavy-equipment builders.
Yes, it equalizes it. Because the rod occupies space on both sides of the piston, the push and pull forces are identical. This model outputs 739 N in both directions at 0.7 MPa, unlike a single-rod cylinder which has a weaker pull force.
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