Airtac SCJ40 Standard Cylinder SCJ40X70-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X70-50S 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, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke70 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X70-50S
The SCJ40X70-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, giving you precise control over the stroke end position. With a 40 mm bore and a 16 mm diameter rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a capable actuator for mid-range automation tasks.
The rear-cap adjusting screw provides a 50 mm adjustment range, allowing the effective stroke to be shortened from the nominal 70 mm without replacing the cylinder. This model includes a built-in magnet, enabling easy mounting of CMSG, DMSG, or EMSG sensors directly on the tie-rod barrel for reliable end-of-stroke detection. Its compact body length A is 185 mm, and it features a 21 mm air cushion for smooth deceleration.
Airtac SCJ40 Standard Cylinder SCJ40X70-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X70-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 70 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 SCJ40X70-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 SCJ40X70-50S Is Used
Format Changeovers
Quickly adjust the end stop for different product sizes on a packaging line without mechanical modifications, reducing downtime between batches.
Dispensing Systems
Fine-tune the dispense head's travel in an adhesive or sealant application to control bead placement with high repeatability.
Clamping & Pressing
Set a precise clamping stroke for parts with slight thickness variations, ensuring consistent pressure without over-travel.
Is the Airtac SCJ40 Standard Cylinder SCJ40X70-50S the Right Cylinder?
Choose the SCJ40X70-50S when you need to fine-tune the stroke end on a machine during commissioning or for different product runs. If you require more force, stepping up to a 50 mm bore provides 982 N of push force at the same pressure. For applications needing a fixed, non-adjustable stroke, the standard SC series is a direct alternative. A direct replacement must match the 40 mm bore, 70 mm nominal stroke, 50 mm adjust range, PT port thread, and the built-in magnet option.
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 SCJ40X70-50S 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 push force is higher because the single rod reduces the effective piston area on the return stroke.
A screw in the rear cap lets you shorten the stroke end by up to 50 mm from the nominal 70 mm. This adjustment is done manually on the cylinder itself and does not change the bore size or force output.
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Related AirTAC SCJ Adjustable-Stroke Cylinders
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