Airtac SCJ50 Standard Cylinder SCJ50X275-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-75S 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 SCJ50X275-75S
The SCJ50X275-75S delivers a nominal 275 mm stroke that can be fine-tuned in the field by up to 75 mm using the rear-cap adjusting screw, giving you a precise 200–275 mm working range without swapping the cylinder. With a 50 mm bore and 20 mm rod, it generates 982 N of push force at 0.5 MPa and reaches 1767 N at the maximum operating pressure of 0.9 MPa, making it a solid mid-range actuator for positioning tasks.
This model includes a built-in magnet (denoted by the -S suffix), so you can directly clamp CMSG/DMSG/EMSG reed or solid-state sensors onto the tie-rod barrel for reliable end-of-stroke detection. The body length A is 194 mm, and the standard PT1/4 port and M16x1.5 rod thread ensure straightforward plumbing and tooling attachment.
Airtac SCJ50 Standard Cylinder SCJ50X275-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-75S |
|---|---|
| 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 SCJ50X275-75S
| 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 SCJ50X275-75S Is Used
Commissioning & Setup
Dial in the exact stroke end during machine commissioning with the 75 mm rear adjuster, eliminating the need to machine custom stops or swap cylinders to find the optimal actuator position.
Format Changeover
Quickly adapt a pusher or diverter station to different box or pallet sizes on a packaging line. The operator adjusts the screw to set a new stroke end for each format without any disassembly.
Wear Compensation
In clamping or pressing fixtures, use the adjustable stroke to take up slack as tooling or contact surfaces wear over time, maintaining consistent clamp force and part contact without reprogramming a servo axis.
Is the Airtac SCJ50 Standard Cylinder SCJ50X275-75S the Right Cylinder?
Choose this SCJ50 when you need more force than the 40 mm bore (628 N push at 0.5 MPa) but do not require the 63 mm bore's 1559 N push. The 75 mm adjustment range is ideal for applications where the stroke end must be dialled in during commissioning or changed across product formats. If your stroke never needs field adjustment, the fixed-stroke SC50 offers the same force in a slightly shorter body.
For a direct replacement, match the 50 mm bore, 275 mm nominal stroke, 75 mm adjust range, PT thread, basic mounting, and the -S magnet option. At 275 mm, the rod is fully supported by the front bushing, but if your load applies a significant side force, consider adding an external guide rail or switching 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 (-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 SCJ50X275-75S FAQ
The output force depends only on the bore, rod, and air pressure, not the stroke setting. At 0.5 MPa, it produces 982 N pushing and 825 N pulling. At the maximum operating pressure of 0.9 MPa, the push force increases to 1767 N. The rear screw only limits the stroke end position; it does not regulate force or speed.
Yes, this is a genuine AirTAC replacement. To ensure a drop-in fit, match the 50 mm bore, 275 mm nominal stroke, and 75 mm adjustment range. Also confirm your port thread is PT, your mounting is basic, and that your sensors are compatible with the built-in magnet (-S). The cylinder tie-rod body and mounting footprint are identical to the standard SCJ50 series.
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