Airtac SCJ50 Standard Cylinder SCJ50X500-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X500-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 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-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X500-20
The SCJ50X500-20 is a double-acting, single-rod pneumatic cylinder from AirTAC, engineered with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end control. With a 50 mm bore and 20 mm rod diameter, it delivers a push force of 982 N at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, making it a robust choice for mid-range linear tasks where the final position needs on-machine fine-tuning.
This tie-rod cylinder features a PT1/4 port, an M16x1.5 rod thread, and a 21 mm air cushion for smooth deceleration. Its body length A is 194 mm, and it operates reliably in a -20 to +70 °C temperature range with the standard TPU seal. The 500 mm nominal stroke is well within the 1200 mm maximum standard stroke for this bore, ensuring it is a readily available, standard configuration.
Airtac SCJ50 Standard Cylinder SCJ50X500-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X500-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 500 mm |
| Stroke adjustment | Up to 20 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 SCJ50X500-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×500 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ50X500-20 Is Used
End-Stop Calibration
Use the 20 mm adjust screw to dial in the precise stroke end position during machine commissioning, eliminating the need for external hard stops or shims.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to compensate for pad or tooling wear, maintaining consistent clamping force.
Format Changeover
Quickly adapt the cylinder's end position for different product sizes on a packaging line, reducing changeover time between batches without mechanical modifications.
Is the Airtac SCJ50 Standard Cylinder SCJ50X500-20 the Right Cylinder?
Select this 50 mm bore cylinder when your application requires a push force around 982 N at standard plant pressure. If your force needs are lower, stepping down to the 40 mm bore (628 N push) can save space and air consumption; for significantly higher demands, the 63 mm bore offers 1559 N of push force. The 20 mm adjustment range is ideal for commissioning trials or compensating for minor mechanical wear without replacing the cylinder.
For a direct replacement, match this unit with another AirTAC SCJ adjustable-stroke cylinder of the same 50 mm bore, 500 mm nominal stroke, and 20 mm adjust range, with PT ports and basic mounting. At this 500 mm stroke length, be mindful of side-loading on the 20 mm rod; if the load is not perfectly guided, 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 (-20)
- ✓ 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 SCJ50X500-20 FAQ
A screw in the rear cap limits the piston's return stroke. By turning it, you can shorten the stroke end by up to 20 mm from the nominal 500 mm. This is a mechanical stop adjustment, not a pressure or speed control, and does not alter the cylinder's force output.
At 0.5 MPa, the push force is 982 N and the pull force is 825 N due to the single 20 mm rod. The maximum push force at the 0.9 MPa operating limit is 1767 N. For applications requiring equal push and pull force, a double-rod (SCD) cylinder would be needed.
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