Airtac SCJ50 Standard Cylinder SCJ50X75-30S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X75-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 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-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X75-30S
The SCJ50X75-30S is a 50 mm bore, single-rod, double-acting pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. At 0.5 MPa it delivers 982 N of push force and 825 N on the pull stroke, making it a strong mid-range actuator for tasks that need fine end-position tuning during commissioning or format changes.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG solid-state and reed sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm diameter piston rod and 21 mm air cushion at each end handle rapid cycling, while the PT1/4 port and M16x1.5 rod thread integrate into standard pneumatic circuits.
Airtac SCJ50 Standard Cylinder SCJ50X75-30S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X75-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 30 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 SCJ50X75-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X75-30S Is Used
Commissioning & Setup
The 30 mm rear screw adjustment lets technicians dial in the exact stroke end-stop on a new machine without swapping cylinders or machining external hard stops, speeding up initial runoff.
Product Changeover
On a packaging line, operators can quickly shorten the stroke by up to 30 mm to accommodate a different box size, eliminating mechanical change parts and reducing downtime between batches.
Wear Compensation
In a clamping or pressing fixture, the adjustable stroke can be extended slightly over time to compensate for pad wear, maintaining consistent clamping force without replacing the tooling.
Is the Airtac SCJ50 Standard Cylinder SCJ50X75-30S the Right Cylinder?
Choose the SCJ50 when you need a mid-bore cylinder with push force around 982 N at 0.5 MPa. If your load demands more force, step up to the 63 mm bore (1559 N push at 0.5 MPa); for a lighter, more compact solution, the 40 mm bore delivers 628 N. Because the stroke is under 300 mm, rod bending from side loads is less of a concern, but always align the rod with the load path.
This adjustable-stroke cylinder replaces any AirTAC SCJ50 with a 75 mm nominal stroke and 30 mm adjust range, provided the port thread (PT), magnet option (-S), and basic mounting match. If you never need to alter the stroke length on the machine, the fixed-stroke SC50X75 is a simpler alternative.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X75-30S FAQ
At 0.5 MPa, it produces 982 N of push force and 825 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the push force is always greater than the pull force.
Yes, if you need the ability to fine-tune the stroke end. The SCJ50X75-30S has the same bore, port size, and mounting footprint as an SC50, but the rear adjusting screw adds a 30 mm reduction range. The body length A is 194 mm, slightly longer than a fixed-stroke SC50.
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