Airtac SCJ40 Standard Cylinder SCJ40X400-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-50S
The SCJ40X400-50S is a double-acting, single-rod pneumatic cylinder from the AirTAC SCJ adjustable-stroke family, featuring a rear-cap adjusting screw that provides up to 50 mm of field-adjustable stroke-end reduction. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a versatile actuator for applications requiring fine position tuning during commissioning or format changes.
The built-in magnet (suffix -S) allows direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. Its PT1/4 ports and M12x1.25 rod thread are standard, while the 21 mm air cushion at each end decelerates the piston smoothly. The body length A dimension is 185 mm plus the 400 mm nominal stroke, offering a compact yet powerful solution for mid-range linear tasks.
Airtac SCJ40 Standard Cylinder SCJ40X400-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 50 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 SCJ40X400-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40X400-50S Is Used
Multi-Product Conveyor Stops
Fine-tune the stop position for boxes or pallets of varying widths on a conveyor line. The 50 mm adjustment range allows operators to quickly dial in the correct stroke end for each product run without mechanical modifications.
Test & Commissioning Rigs
Ideal for lab fixtures and R&D test stands where the exact stroke length must be empirically determined. Engineers can adjust the rear screw to set the precise end point for a pressing or clamping operation during the development phase.
Wear Compensation in Clamping
In high-cycle clamping tools, the adjustable stroke end can be used to take up mechanical wear on contact surfaces or workpieces over time, maintaining consistent clamp force without reprogramming the machine controller or adding shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-50S the Right Cylinder?
Choose the SCJ40X400-50S when your application benefits from a 50 mm adjustable stroke end, such as aligning a stop position for different product sizes without replacing the cylinder. If you need more force, step up to the 50 mm bore SCJ series, which provides 982 N of push force at 0.5 MPa. For applications where the stroke length is fixed and never needs field adjustment, the standard SC fixed-stroke cylinder offers a simpler, more cost-effective alternative. This model is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 400 mm nominal stroke, 50 mm adjustment range, PT ports, and a built-in magnet. For strokes of 300 mm or more, be mindful of side loading; if the rod is subjected to radial forces, use an external linear guide or switch 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 (-50)
- ✓ 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 SCJ40X400-50S FAQ
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder produces 628 N of push force and 528 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum theoretical force at 1.0 MPa is 128 kgf.
A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm from the 400 mm nominal maximum. It is a direct dimensional replacement for another SCJ40X400-50S. If you do not need field adjustability, a fixed-stroke SC40X400 cylinder can be used, but you will lose the ability to fine-tune the stroke end on the machine.
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