Airtac SCJ50 Standard Cylinder SCJ50X400-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-75S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke400 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X400-75S
The SCJ50X400-75S is a double-acting, single-rod pneumatic cylinder that delivers a push force of 982 N at 0.5 MPa, making it a solid choice for mid-range industrial tasks where the end-of-stroke position needs fine-tuning. Its rear-cap adjusting screw provides up to 75 mm of stroke-end reduction, so you can dial in the exact stopping point on the machine without swapping the cylinder or adding external hard stops.
This model features a built-in magnet, allowing CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for reliable position feedback. The 20 mm diameter piston rod and PT1/4 ports are standard for the 50 mm bore, and the adjustable air cushion helps decelerate the piston smoothly. With a body length A(SCJ) of 194 mm plus stroke, it fits into layouts where commissioning trials or format changes demand a variable stroke end.
Airtac SCJ50 Standard Cylinder SCJ50X400-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 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 SCJ50X400-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SCJ50X400-75S Is Used
Commissioning & Setup
The 75 mm adjustment range lets technicians fine-tune the stroke end during machine commissioning without removing the cylinder, saving hours of mechanical rework on packaging or assembly lines.
Format Changeovers
Quickly adapt the stopping position for different product sizes on conveyors or diverters. The SCJ50X400-75S adjusts in-field, eliminating the need to stock multiple fixed-stroke cylinders.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke end can take up tooling wear over time, maintaining consistent contact force without reprogramming the PLC or adding shims.
Is the Airtac SCJ50 Standard Cylinder SCJ50X400-75S the Right Cylinder?
Choose the SCJ50X400-75S when your application needs a nominal 400 mm stroke but you require the flexibility to shorten the stroke end by up to 75 mm during setup or changeover. If 982 N of push force at 0.5 MPa is insufficient, stepping up to the 63 mm bore (SCJ63 series) provides 1559 N of push force. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder of the same 50 mm bore, 400 mm nominal stroke, 75 mm adjust range, PT port thread, and built-in magnet. For strokes of 300 mm or more, consider an external guide or a guided cylinder to protect the 20 mm rod from side-load bending.
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 SCJ50X400-75S FAQ
At 0.5 MPa, this 50 mm bore cylinder delivers 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.
Not directly. The SCJ50X400-75S has a rear adjusting screw that allows you to shorten the stroke end by up to 75 mm. A fixed-stroke SC50 would lack this field-adjustable feature, so the machine's end-stop position would not be tunable without adding external hardware.
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