Airtac SCJ50 Standard Cylinder SCJ50X275-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X275-40
The SCJ50X275-40 is a double-acting, single-rod tie-rod cylinder with a field-adjustable stroke end, giving you up to 40 mm of fine-tuning range from the rear cap. At 0.5 MPa it delivers 982 N of push force and 825 N on the pull stroke, using a 20 mm diameter piston rod and PT1/4 ports. The adjustable screw lets commissioning engineers dial in the exact stroke end without swapping the cylinder or adding external hard stops.
With a 275 mm nominal stroke and a 21 mm air cushion at each end, this cylinder decelerates the piston smoothly before it contacts the adjusting screw. The body length A(SCJ) is 194 mm plus stroke, making it slightly longer than a fixed-stroke SC of the same bore. It operates on filtered air from 0.15 to 1.0 MPa and handles ambient temperatures from -20 to +70 °C with its standard TPU seals.
Airtac SCJ50 Standard Cylinder SCJ50X275-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 40 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 SCJ50X275-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×275 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X275-40 Is Used
Commissioning & Setup Trials
During machine commissioning, the 40 mm rear adjuster lets technicians fine-tune the stroke end position in seconds with a hex key, eliminating the need to machine custom stop blocks or swap cylinders when the exact stroke is still being determined.
Product Format Changeover
On packaging or assembly lines that run multiple product sizes, the SCJ50X275-40 allows operators to quickly dial in a new stroke end for different box heights or part lengths, reducing changeover downtime without any disassembly.
Wear Compensation & End-Stop Adjustment
In clamping or pressing fixtures where tooling or contact surfaces wear over time, the adjustable stroke screw compensates for material loss by advancing the stroke end, maintaining consistent clamp force and part contact without re-machining fixture plates.
Is the Airtac SCJ50 Standard Cylinder SCJ50X275-40 the Right Cylinder?
Step up to a 63 mm bore SCJ if your application needs more force—the SCJ63 delivers 1559 N push at 0.5 MPa. For lighter, more compact installations, the 40 mm bore SCJ40 provides 628 N push. If your stroke never needs field adjustment, a fixed-stroke SC50 cylinder is a simpler, lower-cost alternative. This SCJ50X275-40 is a direct replacement for another AirTAC SCJ50 with a 275 mm nominal stroke and 40 mm adjust range, PT ports, and basic mounting. At 275 mm of stroke, 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 to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X275-40 FAQ
The cylinder produces 982 N of push force and 825 N of pull force at 0.5 MPa. The rear adjusting screw only sets the physical stroke end position within a 40 mm range; it does not alter the bore size, piston area, or output force. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N.
Yes, this is a direct dimensional and performance match for any AirTAC SCJ50 cylinder with a 275 mm nominal stroke and a 40 mm adjustable range, PT ports, and basic mounting. If your existing cylinder has a magnet (S suffix), a different mounting bracket, or G threads, you must order the corresponding suffix code to ensure full compatibility.
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