Airtac SCJ50 Standard Cylinder SCJ50X50-50LB
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-50LB is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø50mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke50 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X50-50LB
The SCJ50X50-50LB provides a 50 mm nominal stroke with a generous 50 mm rear-end adjustment range, letting you fine-tune the stroke end position on the fly without swapping the cylinder. At 0.5 MPa, it delivers 982 N of push force and 825 N on the pull stroke, backed by a 20 mm diameter piston rod and PT1/4 ports.
This LB variant arrives with axial foot mounts bolted directly to the barrel, making it straightforward to secure onto a machine bed or bracket. The body length A(SCJ) is 194 mm, and the built-in air cushion decelerates the piston smoothly across the 30-800 mm/s speed band.
Airtac SCJ50 Standard Cylinder SCJ50X50-50LB Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-50LB |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| 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 SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X50-50LB
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -50 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac SCJ50 Standard Cylinder SCJ50X50-50LB Is Used
Packaging Line Pusher
Adjust the stroke end in small increments to accommodate different box widths without changing the cylinder or adding mechanical stops.
Clamping & Fixturing
Set the final clamp position precisely during setup, then use the 50 mm range to compensate for part tolerance variations over a production run.
Format Changeover Station
Quickly dial the stroke back for a new product size on a multi-format machine, reducing downtime between batches.
Is the Airtac SCJ50 Standard Cylinder SCJ50X50-50LB the Right Cylinder?
Choose the SCJ50X50-50LB when you need to dial in a precise end stop during commissioning or format changes, and prefer bolting the cylinder down via its feet. If you need more push force, the SCJ63X50-50 steps up to 1559 N at 0.5 MPa with the same 20 mm rod. For a fixed-stroke alternative without the rear screw, the standard SC50X50 is a direct swap. To replace this unit, match the 50 mm bore, 50 mm nominal stroke, 50 mm adjustment range, PT ports, and LB foot mount.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ Required force at your working pressure
- ✓ 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 Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X50-50LB FAQ
A rear-cap adjusting screw limits how far the piston extends, giving you up to 50 mm of stroke-end reduction from the nominal 50 mm maximum. It sets the end position only and does not alter the cylinder's force or speed.
At 0.5 MPa air pressure, it generates 982 N pushing out and 825 N retracting. The push force is higher because the single rod reduces the effective piston area on the pull side.
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