Airtac SCJ40 Standard Cylinder SCJ40X70-40STC
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-40STC 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke70 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X70-40STC
The SCJ40X70-40STC 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 reduction, letting you fine-tune the end position without changing the cylinder. Its 16 mm rod and PT1/4 port deliver 628 N of push force at 0.5 MPa, making it a versatile actuator for mid-range pneumatic tasks.
This model is factory-configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mount that ships with the TCM1 bracket (F-SC40TC), allowing the cylinder to pivot and handle swinging loads. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends.
Airtac SCJ40 Standard Cylinder SCJ40X70-40STC Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 70 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 SCJ40X70-40STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SCJ40X70-40STC Is Used
Commissioning & Setup
The 40 mm adjust range allows technicians to dial in the precise stroke end position during machine commissioning, compensating for minor assembly tolerances without needing to swap out the cylinder or machine custom stops.
Product Changeover
On packaging or sorting lines, the stroke can be quickly re-adjusted for different product sizes. The centre trunnion mount is ideal for the pivoting motion often required in diverter gates or flippers.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up slack as tooling or contact surfaces wear over time, maintaining consistent clamping force and position without mechanical shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X70-40STC the Right Cylinder?
Choose the SCJ40 for applications needing around 628 N of push force at standard plant pressure. If you require more force, stepping up to the 50 mm bore provides 982 N of push. For a fixed-stroke application where no field adjustment is needed, the standard SC40 is a more economical choice. This SCJ40X70-40STC is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 70 mm nominal stroke, 40 mm adjust range, PT ports, a magnet, and a TC centre trunnion mount.
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 SCJ40X70-40STC FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
No. Like all standard double-acting cylinders, the SCJ40X70-40STC will not hold its position if air pressure is exhausted or the directional valve is centered. The adjustable screw only sets the stroke end position and does not act as a mechanical lock. For load holding without live pressure, you must add an external rod brake or a pilot-operated check valve.
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