Airtac SCJ50 Standard Cylinder SCJ50X80-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 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-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-75S
The SCJ50X80-75S is a 50 mm bore, single-rod double-acting cylinder from AirTAC's SCJ series, delivering a push force of 982 N at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides up to 75 mm of field-adjustable stroke-end reduction, allowing operators to fine-tune the 80 mm nominal stroke for precise end-position setup without changing the cylinder.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the barrel for reliable end-of-stroke detection. The 20 mm diameter rod and PT1/4 port thread handle standard pneumatic connections, while the 21 mm air cushion decelerates the piston smoothly, making it a versatile workhorse for dynamic positioning tasks.
Airtac SCJ50 Standard Cylinder SCJ50X80-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 75 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 SCJ50X80-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ50X80-75S Is Used
Commissioning & Setup
The 75 mm adjustment range allows technicians to dial in the exact stroke end position during initial machine setup, compensating for minor assembly variations without fabricating custom stops.
Format Changeovers
On packaging or sorting lines, operators can quickly adjust the cylinder's end stop to handle different product sizes or box dimensions, reducing downtime between production runs.
Wear Compensation
In clamping or pressing applications, the stroke can be extended over time to compensate for tooling or pad wear, maintaining consistent contact force without immediate part replacement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-75S the Right Cylinder?
Choose the SCJ50X80-75S when you need a mid-bore cylinder with a wide 75 mm adjustment window for commissioning or format changes. If 982 N of push force at 0.5 MPa is insufficient, stepping up to a 63 mm bore provides 1559 N; if the force is adequate but a fixed stroke is acceptable, the standard SC series reduces cost and complexity. The adjustable stroke is purely mechanical, altering only the end position, not the force.
For direct replacement, match the 50 mm bore, 80 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet. This basic-mount model accepts the SCJ mounting subset: FA front flange (F-SC50FA), LB foot mount (F-SC50LB), or TC centre trunnion (F-SC50TC) for pivoting applications. Note that flange FB and clevis CA/CB mounts are not compatible with the SCJ tie-rod design.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ50X80-75S FAQ
At the standard 0.5 MPa operating pressure, the cylinder provides 982 N of push force and 825 N of pull force due to the 20 mm rod reducing the piston area on the retract side. The maximum push force at 0.9 MPa is 1767 N.
Yes, the SCJ50X80-75S is a direct dimensional replacement for an SC50X80, adding the rear adjustment screw. Ensure your mounting and port connections (PT1/4) match, and that you have clearance for the slightly longer body length A of 194 mm. The -S suffix adds a magnet for sensors, which must be accounted for if your original cylinder did not have one.
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