Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S
The B04-SCD40X125S is an AirTAC double-acting, double-rod cylinder built for construction machinery. The B04- prefix marks this as a heavy-equipment dedicated variant of the SCD40X125S, meaning it is mechanically identical to the standard model. It features a 40 mm bore and 125 mm stroke, with a 16 mm piston rod extending through both end caps. Because the rod area is subtracted on both sides, the effective pressure area is identical in each direction, yielding 739 N of thrust and pull force at 0.7 MPa.
This unit includes a built-in magnet (the S suffix) so CMSG, DMSG, or EMSG reed and solid-state sensors can clamp directly onto the barrel for end-of-stroke signaling. The standard TPU seal operates from -20 to +70 C, and the adjustable cushion runs 21 mm to decelerate the piston near the ends. With a PT1/4 port and an overall body length A of 191 mm, it provides symmetric bearing loading and enhanced anti-rotation support for dual-tooling or two-sided actuation tasks.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 125 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-SCD40X125S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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-SCD40X125S Is Used
Excavator Control Linkages
Provides equal push and pull thrust for symmetric positioning of auxiliary linkages on heavy construction equipment, utilizing the rear rod for a stopper or sensor flag.
Shuttle Transfer Tables
Drives bidirectional transfer shuttles on machinery assemblies, where the through-rod ensures identical speed and force regardless of travel direction.
Non-Rotating Tooling Pushers
Handles two-sided actuation tasks requiring better anti-rotation stability than a single-rod unit, with the built-in magnet confirming stroke endpoints.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125S the Right Cylinder?
Choose this 40 mm bore when an application requires 739 N of equal force in both directions at 0.7 MPa. If your machine needs less thrust, stepping down to a 32 mm bore drops the output to 483 N at the same pressure. Conversely, a 50 mm bore raises the bidirectional force to 1154 N. A single-rod SC cylinder is preferable if you only need one-sided actuation and want a shorter body, while a true guided cylinder is necessary for heavy side loads that exceed what a through-rod can support.
To replace this cylinder, match the 40 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting style, and the built-in magnet. The 125 mm stroke is within the 1200 mm maximum standard stroke for this bore, making it a standard off-the-shelf configuration. For strokes of 300 mm or longer, the extended unsupported rod is susceptible to bending under side loads, requiring an external guide or a guided cylinder to prevent damage.
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-SCD40X125S FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant of the standard SCD40X125S. It is mechanically identical to the base model, offering the same 40 mm bore, 125 mm stroke, and 739 N equal push/pull force at 0.7 MPa, but is designated for heavy-equipment builders.
The double-rod design provides identical 739 N force and speed in both directions because the 16 mm rod area is subtracted from both chambers. It also offers a rear rod for mounting a second tool or sensor flag, and better anti-rotation support than a single-rod cylinder, though it is not a substitute for a guided cylinder under heavy side loads.
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