Airtac SCJ50 Standard Cylinder SCJ50X80-40S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-40S 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. Ø50mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke80 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-40S
The SCJ50X80-40S is a 50 mm bore double-acting, single-rod cylinder with a field-adjustable stroke end, giving you a 40 mm adjustment range on the 80 mm nominal stroke. The rear-cap screw lets you dial in the exact end position without swapping the cylinder, making it ideal for commissioning trials or format changes. It delivers 982 N of push force at 0.5 MPa and houses a 20 mm diameter piston rod, with an adjustable air cushion to decelerate the load smoothly.
This model includes a built-in magnet, so you can mount CMSG/DMSG/EMSG reed or solid-state sensors directly on the tie-rod barrel for end-of-stroke position feedback. The body length A is 194 mm, and the standard PT1/4 ports connect easily to common pneumatic circuits. It operates from 0.15 to 1.0 MPa and handles speeds from 30 to 800 mm/s, with a TPU seal for standard -20 to +70 C environments.
Airtac SCJ50 Standard Cylinder SCJ50X80-40S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SCJ50 Standard Cylinder SCJ50X80-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | 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 SCJ50 Standard Cylinder SCJ50X80-40S Is Used
Commissioning & Fine-Tuning
During machine setup, the 40 mm stroke-end adjustment lets technicians dial in the exact stop position for a pusher or stop gate without machining new brackets, saving hours of mechanical work.
Format Changeovers
On packaging lines that handle multiple product sizes, the adjustable stroke allows operators to quickly reset the cylinder's end position for a different box height or pallet size, minimizing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the stroke can be extended slightly over time to compensate for pad wear or material compression, maintaining consistent clamping force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-40S the Right Cylinder?
Choose the SCJ50X80-40S when you need to fine-tune the stroke end position by up to 40 mm on a machine, rather than using external hard stops. If the 982 N push force at 0.5 MPa is slightly low, stepping up to a 63 mm bore SCJ provides 1559 N push; if it is more than you need, a 40 mm bore delivers 628 N. For applications where the stroke never needs field adjustment, a fixed-stroke SC50X80 is a simpler, lower-cost alternative.
To replace this unit, match the 50 mm bore, 80 mm nominal stroke, 40 mm adjust range, PT port thread, and built-in magnet. This basic-mount cylinder uses the standard tie-rod mounting pattern; add an FA front flange or LB foot bracket if panel or surface mounting is required. For strokes over 300 mm, consider an external guide rail to protect the 20 mm rod from side loads.
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 SCJ50 Standard Cylinder SCJ50X80-40S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. Because this is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Yes, provided your application can accommodate the slightly longer body length (A=194 mm) for the adjusting screw mechanism. The mounting footprint, rod thread (M16x1.5), and port size (PT1/4) are identical. You will gain the ability to shorten the stroke end by up to 40 mm, but the nominal 80 mm stroke remains the maximum.
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