Airtac SCJ40 Standard Cylinder SCJ40X650-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X650-40S 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, 650mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke650 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X650-40S
The SCJ40X650-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 40 mm fine-tuning range on the nominal 650 mm stroke. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, rising to 1130 N at the 0.9 MPa maximum operating pressure, making it a strong mid-range actuator for positioning tasks.
A built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for end-of-stroke detection without extra brackets. The cylinder uses a 16 mm diameter piston rod, PT1/4 ports, and an M12x1.25 rod thread, with a 21 mm air cushion to decelerate the piston smoothly. The body length A(SCJ) is 185 mm plus stroke, slightly longer than a fixed-stroke SC due to the rear adjusting mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X650-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X650-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 650 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 SCJ40X650-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SCJ40X650-40S Is Used
Commissioning & Setup
During machine commissioning, the 40 mm adjust screw lets technicians fine-tune the 650 mm end-stop position in seconds, compensating for small build tolerances without re-machining mounting brackets.
Wear Take-Up on Stops
On a packaging line where a mechanical stop slowly wears, the 40 mm adjustment range can be used to restore the precise stopping position, extending the time between maintenance cycles.
Format Changeover
For a machine handling multiple product sizes, the adjustable stroke allows a quick change of the cylinder's end position by up to 40 mm, enabling a single actuator to serve two different format settings.
Is the Airtac SCJ40 Standard Cylinder SCJ40X650-40S the Right Cylinder?
Choose this 40 mm bore when the 32 mm SCJ's 402 N push at 0.5 MPa is marginal but a 50 mm unit's 982 N is excessive for your load. The 40 mm adjustment range lets you dial in the exact stroke end during commissioning or after tooling wear, without swapping the cylinder. For a fixed-stroke application where no adjustment is ever needed, a standard SC40X650 would be the simpler, slightly shorter alternative.
At 650 mm stroke, rod buckling under side load is a real risk. If your load is not perfectly guided, add an external guide rail or switch to a guided cylinder to protect the 16 mm rod. The direct replacement is another AirTAC SCJ40X650-40S with a magnet, PT ports, and basic mounting; the F-SC40LB foot mount or F-SC40FA front flange can be added if a bracket is needed later.
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 SCJ40X650-40S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (single rod, so pull force is lower due to the 16 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
Yes, if you need the adjustable stroke feature. The SCJ40X650-40S has the same bore, port size (PT1/4), and rod thread (M12x1.25) as an SC40X650, but the body is slightly longer to house the rear adjusting screw. Ensure you have clearance for the extra length and the 40 mm adjustment range.
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