Airtac SCJ40 Standard Cylinder SCJ40X50-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø40mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-20
The SCJ40X50-20 is a double-acting, single-rod pneumatic cylinder from AirTAC, featuring a rear-cap adjusting screw that allows the stroke end position to be fine-tuned by up to 20 mm. This field-adjustable design is ideal for commissioning and format changes, eliminating the need for external hard stops. With a 40 mm bore, it delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa, driven by a 16 mm diameter piston rod.
This tie-rod cylinder uses PT1/4 ports and an M12x1.25 rod thread, with an adjustable air cushion providing smooth deceleration over the final 21 mm of travel. The body length (A dimension) is 185 mm. It operates on filtered air from 0.15 to 1.0 MPa and is rated for speeds of 30-800 mm/s, making it a versatile workhorse for industrial automation tasks requiring a compact, adjustable stroke.
Airtac SCJ40 Standard Cylinder SCJ40X50-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 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 SCJ40X50-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40X50-20 Is Used
End-Stop Calibration
Fine-tune the retract or extend end position during machine commissioning without re-machining brackets, using the 20 mm adjustment screw to perfectly align tooling or stops.
Product Format Changeover
Quickly adapt a pusher or diverter's stroke on a packaging line for different box sizes by adjusting the rear screw, minimizing downtime between production runs.
Wear Compensation
Take up mechanical play or seal wear in clamping and pressing fixtures over time by incrementally adjusting the stroke end, maintaining consistent clamping force and position.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-20 the Right Cylinder?
Choose the SCJ40X50-20 when you need to precisely dial in a 50 mm maximum stroke on the machine, with 20 mm of adjustment to compensate for wear or setup variances. If you require more force, stepping up to a 50 mm bore provides 982 N of push force at the same pressure. For applications where the stroke length is fixed and never needs field adjustment, the standard SC40X50 fixed-stroke cylinder is a more economical choice. A direct replacement must match the 40 mm bore, 50 mm nominal stroke, 20 mm adjustment range, PT port thread, and basic mounting configuration.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40X50-20 FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides a push force of 628 N and a pull force of 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N.
Physically, it can mount in the same space, but the SCJ body is slightly longer to house the adjusting mechanism. It is a direct functional replacement only if you need the 20 mm adjustable stroke feature. Ensure the port size (PT1/4) and mounting style match your existing setup.
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