Airtac SCJ50 Standard Cylinder SCJ50X75-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-40 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke75 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-40
The SCJ50X75-40 is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 75 mm stroke, featuring a rear adjusting screw that provides up to 40 mm of field-adjustable stroke-end reduction. This allows precise mechanical tuning of the piston stop position without replacing the cylinder or adding external hard stops. With a 20 mm diameter piston rod and PT1/4 ports, it delivers a push force of 982 N at 0.5 MPa, making it a capable mid-range actuator for positioning tasks.
Built on the proven SC tie-rod platform, this cylinder includes an adjustable air cushion to decelerate the piston smoothly at end of travel. The body length A(SCJ) is 194 mm, providing a compact footprint for its force class. Operating on filtered air from 0.15 to 1.0 MPa, it handles speeds of 30-800 mm/s and temperatures from -20 to +70 °C, suiting a wide range of general industrial automation applications.
Airtac SCJ50 Standard Cylinder SCJ50X75-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 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 SCJ50X75-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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 SCJ50X75-40 Is Used
Commissioning & Setup
Ideal for machine builders who need to fine-tune the actuator end-stop during initial system bring-up. The 40 mm adjustment screw allows rapid mechanical setting of the exact stroke required without iterative disassembly.
Product Changeover
Used on packaging lines where the pusher stroke must be altered for different box sizes. Operators can quickly adjust the cylinder's rear screw to match a new format, minimizing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact pressure without reprogramming the machine controller.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-40 the Right Cylinder?
Select the SCJ50X75-40 when you need to dial in a precise stroke end position during commissioning or for format changeovers, with the 40 mm adjustment range offering substantial flexibility. If your force requirement increases, stepping up to a 63 mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For applications needing a fixed, non-adjustable stroke, the standard SC50X75 is a direct alternative with identical mounting and force characteristics. The replacement match for this unit is another SCJ50 with a 75 mm nominal stroke, a 40 mm adjustment range, PT thread, and basic mounting. For strokes of this length, ensure the load is guided if significant side forces are present to prevent rod bending.
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 SCJ50X75-40 FAQ
At 0.5 MPa operating pressure, the cylinder provides a push force of 982 N and a pull force of 825 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. The maximum theoretical push force at 1.0 MPa is 200 kgf.
A screw mechanism in the rear end cap acts as an internal mechanical stop for the piston. By turning the screw, you can shorten the stroke end position by up to 40 mm from the nominal 75 mm maximum. It adjusts the end-of-stroke position only and does not change the cylinder's force or speed.
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