Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S 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. Ø63mm bore, 900mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke900 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S
The B04-SCD63X900S is an AirTAC double-acting, double-rod cylinder where the B04- prefix designates it as a construction-machinery dedicated variant, mechanically identical to the standard SCD63X900S. The through-rod design yields identical thrust and retraction force, outputting 1402 N in both directions at 0.5 MPa and reaching 2523 N at 0.9 MPa. A 900 mm stroke provides extensive travel for heavy-equipment actuation.
Because the Ø20 mm piston rod passes through both end caps, the unit carries tooling or stopper mechanisms on the rear side while offering superior anti-rotation characteristics compared to a single-rod build. The barrel measures 210 mm in body length A(SCD) and features adjustable cushions with a 28 mm length to decelerate the payload smoothly at stroke extremes. The built-in S suffix magnet allows CMSG, DMSG, or EMSG sensors to track piston position along the full 900 mm travel.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 900 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, 28 mm |
| Max stroke | Up to 1500 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 (Ø63mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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-SCD63X900S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×900 | 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-SCD63X900S Is Used
Excavator Panel Shifting
Drives heavy cabin or body panels on earthmoving equipment, utilizing the equal push and pull force to reliably extend and retract components without drift under symmetric loading.
Bidirectional Material Transfer
Powers shuttle mechanisms on construction-material conveyors where tooling is mounted to both rod ends, allowing the 900 mm stroke to move payloads left or right with identical 1402 N thrust.
Non-Rotating Gating Mechanism
Actuates safety gates or heavy-duty latches on machinery, leveraging the through-rod guidance to prevent rod twist and ensuring precise alignment over the long 900 mm travel.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD63X900S the Right Cylinder?
Choose this 63 mm bore when an application demands 1402 N of balanced force at 0.5 MPa across a long 900 mm span. If your mechanism requires less thrust, dropping to a 50 mm bore reduces the output to 825 N each way; stepping up to an 80 mm bore increases it to 2268 N. For tasks needing only one-sided pushing, the standard single-rod AirTAC SC cylinder is lighter and more compact. Furthermore, a double-rod unit offers better guidance than a single rod but is not a substitute for a true guided cylinder under heavy side loads.
At 900 mm of stroke, the unsupported rod length is substantial; always use an external guide rail to prevent rod bending and premature bearing wear. To replace this unit, match the 63 mm bore, 900 mm stroke, PT1/4 port thread, basic mounting style, and the -S magnet option. Note that the adjustable air cushion only decelerates the piston near end-of-stroke and will not hold a load if air pressure is lost—an external mechanical lock or pilot-operated check valve is required for position holding.
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-SCD63X900S FAQ
The B04- prefix indicates this cylinder is part of AirTAC's construction-machinery dedicated line. It is mechanically identical to the standard SCD63X900S, featuring the same 63 mm bore, 900 mm stroke, and 1402 N equal push/pull force at 0.5 MPa, with no changes to physical dimensions or sealing materials.
The double-rod SCD design provides identical force in both directions since the rod area is subtracted from both chambers. It allows mounting tooling on the rear rod, offers better anti-rotation resistance, and balances bearing loads, which is critical for heavy-equipment applications over a 900 mm stroke.
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