Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 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-SCD50X125S
The B04-SCD50X125S is AirTAC's construction-machinery dedicated variant of the SCD50X125S double-acting, double-rod cylinder. The B04- prefix designates it for heavy-equipment builders, but mechanically it is identical to the standard model. It delivers an equal push and pull force of 825 N at 0.5 MPa, making it ideal for balanced two-sided actuation.
A Ø20 mm piston rod passes through both end caps, providing enhanced guidance and anti-rotation properties for dual-tooling setups. The built-in magnet (-S) allows CMSG or DMSG sensors to track piston position directly on the barrel. With a 125 mm stroke and a 21 mm adjustable cushion at each end, it safely decelerates loads up to a 1484 N thrust at 0.9 MPa.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 125 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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-SCD50X125S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | 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-SCD50X125S Is Used
Excavator Control Linkages
Provides equal push and pull thrust for synchronized positioning of heavy-equipment covers or gates where space requires a compact 50 mm bore.
Shuttle Transfer Tables
The through-rod design supports tooling on both ends, enabling perfectly balanced bi-directional part shuttling on construction machinery assembly lines.
Rear-Mounted Stroke Sensing
The built-in magnet allows DMSG sensors to clamp onto the cylinder body, confirming end-of-stroke positions for automated heavy-equipment processes.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S the Right Cylinder?
Choose this 50 mm bore when an application demands identical force in both directions, offering 825 N each way at 0.5 MPa. If your mechanism only requires thrust in one direction, stepping down to a single-rod SC50X125 saves space and weight. Conversely, if side loads are high, a dedicated guided cylinder is recommended over relying solely on the through-rod for support.
For strokes of 125 mm, rod bending is minimal, but always ensure external alignment to prevent bearing wear. To replace this unit, match the 50 mm bore, 125 mm stroke, PT1/4 port thread, basic mounting, and the -S magnet option. The adjustable air cushion decelerates the piston near stroke ends but does not lock or hold the load; a mechanical lock or pilot-operated check valve is required if the load must maintain its 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-SCD50X125S FAQ
The B04- prefix indicates this is AirTAC's construction-machinery dedicated line. It is mechanically identical to the standard SCD50X125S, offering the same 825 N equal push/pull force at 0.5 MPa, PT1/4 ports, and built-in magnet.
A double-rod cylinder provides identical push and pull forces (825 N each way at 0.5 MPa) because the rod area is subtracted from both chambers. It also offers better rod guidance, anti-rotation stability, and a rear rod for mounting secondary tooling or sensor flags.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCD Double-Rod Cylinders
Request a Quote for Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X125S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.