Airtac SCJ50 Standard Cylinder SCJ50X100-75LB
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X100-75LB is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke100 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X100-75LB
The SCJ50X100-75LB is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 75 mm without removing the unit from the machine. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need repeatable end-point adjustment during commissioning or format changes.
This model comes with an LB foot-mounting bracket (F-SC50LB) for secure surface installation and uses standard PT ports and TPU seals for reliable operation from -20 to +70 °C. The body length A is 194 mm, and the adjustable air cushion decelerates the piston smoothly at the stroke end you set with the rear screw.
Airtac SCJ50 Standard Cylinder SCJ50X100-75LB Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X100-75LB |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 75 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 SCJ50X100-75LB
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×100 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X100-75LB Is Used
Commissioning & Setup
Engineers can adjust the stroke end by 75 mm on the fly during machine commissioning, eliminating the need to swap cylinders or fabricate external hard stops to find the optimal actuator throw.
Product Changeover
On a packaging line, the adjustable stroke allows operators to quickly reset a pusher or diverter's end position when switching between different box sizes, reducing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the rear adjusting screw can be used to take up mechanical wear in tooling or seals over time, maintaining consistent contact pressure without reprogramming the machine control system.
Is the Airtac SCJ50 Standard Cylinder SCJ50X100-75LB the Right Cylinder?
Choose this 50 mm bore when your application calls for roughly 1000 N of push force. If you need more power, the 63 mm bore provides 1559 N at the same pressure; for a lighter, more compact solution, the 40 mm bore delivers 628 N. The SCJ series is the right pick when you need to dial in the stroke end on-site—if your stroke length is fixed and never changes, the standard SC fixed-stroke cylinder is a simpler, more economical alternative.
For a drop-in replacement, match the 50 mm bore, 100 mm nominal stroke, 75 mm adjust range, PT port thread, and LB foot mounting. At this 100 mm stroke, side-loading is typically not a primary concern, but for any off-axis force, an external guide rail or a guided cylinder should be used to protect the rod bearing.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ50X100-75LB FAQ
At the standard operating pressure of 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the retract side.
Yes, it is a direct form-and-function replacement for any AirTAC SCJ50X100-75 cylinder with an LB foot mount and PT threads. The adjustable stroke range, port size, rod thread (M16x1.5), and mounting footprint are all identical. Ensure your existing sensor setup is compatible, as this model does not include a built-in magnet.
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