Airtac SCJ40 Standard Cylinder SCJ40X185-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X185-40S 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. Ø40mm bore, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke185 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X185-40S
The SCJ40X185-40S is a 40 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 40 mm of field-adjustable stroke-end reduction. This model delivers 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa) and uses a 16 mm diameter piston rod with PT1/4 ports.
The built-in magnet (-S suffix) allows direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. With a 21 mm air cushion and a body length of 185 mm, it operates on 40 µm filtered air at 0.15-1.0 MPa and speeds of 30-800 mm/s.
Airtac SCJ40 Standard Cylinder SCJ40X185-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X185-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 185 mm |
| Stroke adjustment | Up to 40 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 SCJ40X185-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | 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 SCJ40 Standard Cylinder SCJ40X185-40S Is Used
Commissioning & Setup
The 40 mm adjust range lets technicians dial in the exact stroke end during machine commissioning without cutting guide rails or repositioning hard stops, speeding up the setup of packaging and assembly stations.
Product Changeover
On a multi-format conveyor diverter, the SCJ40X185-40S can be quickly re-adjusted to accommodate different box widths, reducing changeover time between production runs.
Wear Compensation
In clamping or pressing fixtures, the stroke-end screw can be advanced slightly over time to compensate for pad wear or material compression, maintaining consistent clamping force without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X185-40S the Right Cylinder?
Choose the SCJ40X185-40S when you need to fine-tune the stroke end on a machine without swapping cylinders. If a higher force is required, step up to the 50 mm bore SCJ which provides 982 N of push at 0.5 MPa. For applications where the stroke must be absolutely fixed and never adjusted, a standard SC fixed-stroke cylinder is a simpler choice.
This model is a direct replacement for another AirTAC SCJ40 cylinder with a 185 mm nominal stroke, 40 mm adjust range, PT ports, and a built-in magnet. At this 185 mm stroke, ensure the rod is not subjected to significant side loads; if lateral forces are present, add an external linear guide or switch to a guided cylinder assembly.
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 SCJ40 Standard Cylinder SCJ40X185-40S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
Yes, the SCJ40 shares the same body dimensions as the SC40 series and is compatible with the SCJ mounting subset: FA front flange (F-SC40FA), LB foot mount (F-SC40LB), and TC centre trunnion (F-SC40TC) with TCM1 bracket. Note that FB flange and CA/CB clevis mounts are not available for the SCJ.
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