Airtac SCJ40 Standard Cylinder SCJ40X500-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X500-20S 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. Ø40mm bore, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke500 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X500-20S
The SCJ40X500-20S is a 40 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This model delivers 628 N of push force at 0.5 MPa and features a 16 mm diameter piston rod with PT1/4 ports, making it well-suited for medium-duty automation tasks where stroke fine-tuning during commissioning or format changes is required.
A built-in magnet (suffix -S) is integrated into the piston, allowing CMSG/DMSG/EMSG solid-state and reed sensors to be clamped directly onto the tie-rod barrel for reliable end-of-stroke position sensing. The cylinder body length A(SCJ) is 185 mm, and it includes an adjustable air cushion for smooth deceleration. The standard TPU seal ensures consistent operation within a -20 to +70 °C temperature range.
Airtac SCJ40 Standard Cylinder SCJ40X500-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X500-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 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 | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X500-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | 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 SCJ40 Standard Cylinder SCJ40X500-20S Is Used
Commissioning & Setup
The 20 mm stroke-end adjustment allows technicians to precisely dial in the stopping position during initial machine setup without fabricating custom hard stops, saving time on the factory floor.
Wear Compensation
In material handling pushers, the adjustable stroke can compensate for wear on gripper pads or product contact surfaces over time, maintaining consistent engagement without replacing the actuator.
Format Changeovers
For packaging lines that switch between product sizes, the screw adjuster enables rapid stroke-length changes, accommodating different box heights or pallet dimensions with a simple mechanical adjustment.
Is the Airtac SCJ40 Standard Cylinder SCJ40X500-20S the Right Cylinder?
Choose the SCJ40X500-20S when you need a 500 mm nominal stroke with the ability to dial the end position back by up to 20 mm without changing the cylinder. If your force requirement is lower, the 32 mm bore SCJ series offers 402 N of push force at 0.5 MPa; for higher demands, the 50 mm bore provides 982 N. For this 500 mm stroke length, ensure the rod is adequately supported against side loads—consider adding an external linear guide or switching to a guided cylinder if lateral forces are present.
This model is a direct replacement for any AirTAC SCJ40X500-20S cylinder. When replacing, match the 40 mm bore, 500 mm nominal stroke, 20 mm adjustment range, PT port thread, basic mounting, and the built-in magnet. If stroke adjustment is not needed, the fixed-stroke SC series offers a simpler alternative.
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 SCJ40 Standard Cylinder SCJ40X500-20S FAQ
At the standard 0.5 MPa operating pressure, the cylinder produces 628 N of push force and 528 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 128 kgf.
A threaded screw on the rear cap acts as an internal, adjustable end-stop for the piston. By turning the screw, you can shorten the stroke end position by up to 20 mm from the nominal 500 mm maximum. It is a mechanical stroke limiter and does not regulate air pressure, speed, or force.
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