Airtac SCJ40 Standard Cylinder SCJ40X70-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-40S 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, 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 SCJ40X70-40S
The SCJ40X70-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, offering a 40 mm adjustment range on the rear cap to fine-tune the stroke end without removing the unit. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid mid-range actuator for tasks requiring on-machine stroke calibration.
This model includes a built-in magnet (suffix -S), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for precise, non-contact position feedback. The body length A is 185 mm, and it uses PT1/4 ports with an M12x1.25 rod thread. The adjustable screw only sets the stroke end position; it does not alter the cylinder's force output or speed.
Airtac SCJ40 Standard Cylinder SCJ40X70-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-40S |
|---|---|
| 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 SCJ40X70-40S
| 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 SCJ40X70-40S Is Used
Commissioning & Setup
The 40 mm rear-end adjustment allows technicians to quickly fine-tune the end-of-stroke position during initial machine setup without swapping cylinders or machining external hard stops.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear on tooling or workpieces, maintaining consistent contact pressure over time.
Product Format Changeover
Adjust the cylinder's stroke end to accommodate different product sizes on a packaging line. The built-in magnet enables sensor-based confirmation of the new position for automated changeover sequences.
Is the Airtac SCJ40 Standard Cylinder SCJ40X70-40S the Right Cylinder?
Choose the SCJ40 when you need to dial in the stroke end on the fly, such as during commissioning or for format changeovers. If 628 N of push force at 0.5 MPa is insufficient, stepping up to the SCJ50 provides 982 N of push force. For applications where the stroke is fixed and never needs adjustment, the standard SC40 is a simpler, cost-effective alternative.
This cylinder is a direct replacement for another AirTAC SCJ40 with a 70 mm nominal stroke, a 40 mm adjust range, PT ports, a basic mount, and a magnet. If your application involves a stroke of 300 mm or more, be mindful of side loads on the rod; an external guide or a guided cylinder is recommended to prevent rod bending and premature seal wear.
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 SCJ40X70-40S FAQ
At the standard operating pressure of 0.5 MPa, this cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The adjustable stroke screw does not change these force values.
Yes, it is a direct replacement for any AirTAC SCJ40 with a 70 mm nominal stroke, a 40 mm adjustment range, PT ports, a basic mount, and a magnet. Ensure the bore, stroke, adjust range, and port thread match your existing unit.
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