Airtac SCJ50 Standard Cylinder SCJ50X500-75
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X500-75 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke500 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X500-75
The SCJ50X500-75 is a double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you shorten the stroke end by up to 75 mm directly on the machine. With a 50 mm bore and 500 mm nominal stroke, it delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, while the pull force is 825 N at 0.5 MPa due to the 20 mm piston rod.
This adjustable-stroke design uses a 21 mm air cushion to decelerate the piston near the end of travel, and the SCJ body length A measures 194 mm. The cylinder operates on 40 µm filtered air from 0.15 to 1.0 MPa across a -20 to +70 °C temperature range, with a speed envelope of 30-800 mm/s. The 500 mm stroke is within the 1200 mm maximum standard stroke for bore 50, and the PT1/4 port and M16x1.5 rod thread match common pneumatic plumbing.
Airtac SCJ50 Standard Cylinder SCJ50X500-75 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X500-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 500 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 SCJ50X500-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SCJ50X500-75 Is Used
Commissioning & Fine-Tuning
The 75 mm adjustment screw lets technicians dial in the exact stroke end on a new assembly line without removing the cylinder, speeding up start-up and reducing the need for shims or external hard stops.
Format Changeover on Packaging Lines
When a packaging machine switches between box sizes, the SCJ50X500-75 adapts the pusher stroke in minutes by turning the rear screw, eliminating mechanical rework and keeping changeover downtime to a minimum.
Wear Compensation in Clamping Fixtures
In a long-stroke clamping station, the adjustable end position takes up pad wear or material thickness variation over time, maintaining consistent clamp force without reprogramming the PLC or replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X500-75 the Right Cylinder?
Choose the SCJ50 when you need to fine-tune the stroke end position during commissioning or after tooling wear, without swapping the cylinder. If your force requirement drops, the SCJ40 delivers 628 N push at 0.5 MPa; if you need more, the SCJ63 steps up to 1559 N push at 0.5 MPa. For applications where the stroke is permanently fixed and you want a simpler unit, the standard SC series is a better fit.
At a 500 mm stroke, watch for side loading that can bend the 20 mm rod — add an external guide rail or switch to a guided cylinder if the load is not perfectly axial. To replace this unit, match the 50 mm bore, 500 mm nominal stroke, 75 mm adjust range, PT thread, and basic mounting. The F-SC50LB foot mount or F-SC50FA front flange can be added if the mounting style changes.
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 SCJ50X500-75 FAQ
Push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. Pull force is lower because of the single 20 mm rod: 825 N at 0.5 MPa. The adjusting screw does not change the force — it only sets the stroke end position within the 75 mm range.
Yes, if you need the adjustable stroke feature. The SCJ body is slightly longer (A = 194 mm) to house the adjusting screw. Ensure the 50 mm bore, PT1/4 port, and M16x1.5 rod thread match your existing setup. If you do not need adjustability, the standard SC50X500 is the direct fixed-stroke alternative.
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