Airtac SCJ50 Standard Cylinder SCJ50X275-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-75 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke275 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X275-75
The SCJ50X275-75 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke-end reduction, letting you dial in the exact stop position for a 275 mm nominal stroke. With a 20 mm piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa), suiting medium-force positioning and clamping tasks where commissioning or format changes demand on-machine fine-tuning.
Built on the proven SC tie-rod platform, this 50 mm bore cylinder includes an adjustable air cushion (21 mm length) for smooth deceleration and a body length A of 194 mm. The adjusting screw only sets the stroke end—it does not alter force or speed—so pair it with a flow control for full motion tuning. Operating range is 0.15–1.0 MPa with filtered air, and speed is 30–800 mm/s.
Airtac SCJ50 Standard Cylinder SCJ50X275-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 275 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 SCJ50X275-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×275 | 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 SCJ50X275-75 Is Used
Commissioning & Setup
The 75 mm adjustment range lets technicians fine-tune the end-stop position during machine bring-up without removing the cylinder, speeding up start-up on assembly lines.
Format Changeover
On packaging or filling machines that handle multiple product sizes, the rear screw allows quick stroke-end changes between batches, eliminating mechanical stop swaps.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke takes up tooling or pad wear over time, maintaining consistent contact force without reprogramming the machine.
Is the Airtac SCJ50 Standard Cylinder SCJ50X275-75 the Right Cylinder?
Choose the SCJ50X275-75 when you need to fine-tune the stroke end by up to 75 mm without changing the cylinder or adding external hard stops—ideal for commissioning trials, wear take-up, or multi-format fixtures. If you need more push force, step up to the 63 mm bore (1559 N at 0.5 MPa); for a lighter, more compact solution, the 40 mm bore offers 628 N. If your application requires a fixed, repeatable stroke with no adjustment, the standard SC50X275 is a simpler, lower-cost alternative. For direct replacement, match bore (50 mm), nominal stroke (275 mm), adjust range (-75), port thread (PT), and mounting style. At 275 mm stroke, rod bending under side load is a risk—use an external guide or switch to a guided cylinder if the load is not perfectly axial.
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 SCJ50X275-75 FAQ
At 0.5 MPa, push force is 982 N and pull force is 825 N (the difference is due to the 20 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The adjusting screw does not change the force output.
Yes, if the original is an SCJ adjustable-stroke cylinder with 50 mm bore, 275 mm nominal stroke, and a -75 adjustment range. Also match the port thread (PT), mounting accessory (basic/FA/LB/TC), and magnet option. The SCJ series is not dimensionally interchangeable with ISO 15552 cylinders.
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