Airtac SCJ50 Standard Cylinder SCJ50X400-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-40S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-40S
The SCJ50X400-40S is a 50 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, delivering 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa. The rear-cap adjusting screw provides a 40 mm shortening range, letting you fine-tune the end position without swapping the cylinder or adding external hard stops.
A built-in magnet (suffix -S) allows CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the tie-rod barrel for non-contact position sensing. The 20 mm diameter piston rod and PT1/4 port supply reliable cycle rates within a 30-800 mm/s speed range, while the 21 mm air cushion decelerates the load smoothly at stroke end.
Airtac SCJ50 Standard Cylinder SCJ50X400-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-40S Is Used
Commissioning & Setup
The 40 mm adjustment range lets commissioning engineers fine-tune the actuator end stop on a new assembly line without machining custom spacers or repositioning the entire cylinder.
Product Changeover
On a packaging machine running multiple box sizes, the stroke end can be quickly reset via the rear screw to match a new format, minimizing downtime between batches.
Wear Compensation
In a clamping or pressing fixture, the adjustable stroke can be gradually extended over time to compensate for tooling wear or material compression, maintaining consistent clamp force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-40S the Right Cylinder?
Choose the SCJ50X400-40S when you need to dial in a stroke end on a 50 mm bore platform. If your force requirement drops, stepping down to the 40 mm bore (628 N push at 0.5 MPa) reduces air consumption and physical size. For applications where the stroke is permanently fixed, the standard SC50X400 non-adjustable cylinder is a simpler alternative. This model is a direct replacement for an AirTAC SCJ50X400-40S with a PT port, basic mount, and magnet. At 400 mm of nominal stroke, ensure the rod is guided externally or consider a guided cylinder if the load applies significant side force.
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 SCJ50X400-40S FAQ
At a standard factory air pressure of 0.7 MPa, the push force is 1374 N and the pull force is 1155 N. The maximum push force at the 1.0 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the push force is always greater than the pull force.
A threaded screw on the rear cap physically limits how far the piston can retract, shortening the stroke end by up to 40 mm from the 400 mm nominal maximum. It adjusts the end position only and does not change the cylinder's speed, bore size, or force output.
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