Airtac SCJ50 Standard Cylinder SCJ50X275-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke275 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X275-30
The SCJ50X275-30 is a 50 mm bore double-acting single-rod cylinder that lets you dial in the stroke end position with a rear adjusting screw, offering up to 30 mm of field adjustment on the nominal 275 mm stroke. This eliminates the need for external hard stops during commissioning and changeovers. The 20 mm piston rod and PT1/4 pneumatic ports deliver a push force of 982 N at 0.5 MPa, scaling to 1767 N at the maximum operating pressure of 0.9 MPa.
Its tie-rod construction provides a robust, serviceable design with an adjustable air cushion (21 mm long) to decelerate the piston smoothly. The body length A for this SCJ configuration is 194 mm, making it a compact solution for applications where the final stroke position must be precisely matched to a tool or workpiece after installation.
Airtac SCJ50 Standard Cylinder SCJ50X275-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 30 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 SCJ50X275-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×275 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X275-30 Is Used
Commissioning & Setup
Fine-tune the actuator's end stop on a new assembly line without re-machining brackets. The 30 mm adjustment screw lets technicians dial in the exact stroke during initial run-off.
Product Format Changeover
Quickly adapt a packaging machine's pusher stroke for different box sizes. The rear screw adjusts the stroke end, eliminating the need to swap out the cylinder for each product format.
Wear Compensation
In clamping or pressing fixtures, use the adjustable stroke to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamp force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X275-30 the Right Cylinder?
This 50 mm bore model is a strong mid-range actuator. If you need more force, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa, while a step down to the 40 mm bore delivers 628 N for lighter, faster-moving tasks. The adjustable stroke is the key differentiator from a fixed-stroke SC cylinder; choose this SCJ when your machine setup requires fine-tuning the end position to compensate for part tolerances or format changes. For a direct replacement, match the 50 mm bore, 275 mm nominal stroke, 30 mm adjustment range, PT port thread, and basic mounting style. At this stroke length, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external linear guide or switch to a guided cylinder assembly to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X275-30 FAQ
The push force is 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. Because it is a single-rod cylinder, the pull force is lower, at 825 N at 0.5 MPa, due to the area of the 20 mm rod.
Yes, if you need the ability to fine-tune the stroke end position. The SCJ50X275-30 matches the bore and nominal stroke of an SC50X275 but adds a rear adjusting screw with a 30 mm range. Ensure the longer body length A (194 mm) fits your mounting space and that you match the PT port thread and basic mounting.
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