Airtac SCJ50 Standard Cylinder SCJ50X500-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X500-40S 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke500 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X500-40S
The SCJ50X500-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 40 mm adjustment range via a rear-cap screw. With a 50 mm bore, it delivers 982 N of push force at 0.5 MPa, making it suitable for applications requiring precise end-position tuning without swapping the cylinder.
This model features a 20 mm piston rod, M16x1.5 rod thread, and PT1/4 ports. The built-in magnet (-S) allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection. Its body length A(SCJ) is 194 mm plus stroke, and it includes an adjustable air cushion for smooth deceleration.
Airtac SCJ50 Standard Cylinder SCJ50X500-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X500-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 500 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 SCJ50X500-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×500 | 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 SCJ50X500-40S Is Used
Commissioning Fine-Tuning
The 40 mm rear adjustment screw allows engineers to precisely dial in the final stop position on a new assembly line without removing the cylinder, saving setup time.
Format Changeover
Quickly adjust the push stroke for different product sizes on a packaging machine. The sensor-ready magnet confirms the new position is reached every cycle.
Wear Compensation
In long-running clamping or pressing fixtures, the adjustable stroke can be extended slightly to compensate for tooling or pad wear, maintaining consistent force application.
Is the Airtac SCJ50 Standard Cylinder SCJ50X500-40S the Right Cylinder?
Choose the SCJ50X500-40S when you need to fine-tune a 500 mm stroke end position by up to 40 mm during commissioning or changeovers. If the 982 N push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore provides 1559 N. For a fixed stroke without adjustment, the standard SC series is a simpler alternative. This cylinder is a direct replacement for an AirTAC SCJ of the same 50 mm bore, 500 mm nominal stroke, 40 mm adjust range, PT ports, and magnet option. For a 500 mm stroke, ensure the rod is supported if significant side loads are present, or consider an external guide to prevent bending.
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 SCJ50X500-40S FAQ
At 0.5 MPa, the theoretical push force is 982 N and the pull force is 825 N. Since it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
No, it is not a speed control. A rear-cap screw mechanically limits the piston's stroke end by up to 40 mm. It sets the physical stopping point, allowing you to shorten the nominal 500 mm stroke. Operating speed is managed separately by flow controls in your air circuit.
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