Airtac SCJ50 Standard Cylinder SCJ50X125-75S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-75S 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-75S
The SCJ50X125-75S is a double-acting, single-rod pneumatic cylinder offering a 75 mm field-adjustable stroke range via a rear-cap screw, letting you fine-tune the end position without swapping the unit. With a 50 mm bore and 20 mm rod, it delivers 982 N of push force at 0.5 MPa (1767 N at 0.9 MPa) on a 125 mm nominal stroke.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 194 mm, and the adjustable air cushion decelerates the piston smoothly at each end. Operating pressure is 0.15–1.0 MPa with filtered air, and the standard PT1/4 port threads keep connections straightforward.
Airtac SCJ50 Standard Cylinder SCJ50X125-75S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 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 SCJ50X125-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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 SCJ50X125-75S Is Used
Format Changeovers
Quickly dial in a new stroke end position up to 75 mm shorter for different product sizes on packaging or labeling machines without mechanical rework.
Commissioning Fine-Tuning
During machine setup, adjust the cylinder's end stop in the field to perfectly align a pusher or gate, compensating for assembly tolerances.
Wear Compensation
As tooling or gripper pads wear, the 75 mm adjustment range lets you extend the effective stroke to maintain consistent contact pressure and part engagement.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-75S the Right Cylinder?
Choose the SCJ50X125-75S when you need to commission or change over a mid-force stroke end by up to 75 mm without external hard stops. If the 982 N push at 0.5 MPa is marginal, the 63 mm bore SCJ63 series steps up to 1559 N push; if space is tight, the 40 mm bore SCJ40 delivers 628 N. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative.
This cylinder is a direct replacement for another AirTAC SCJ50 with a 125 mm nominal stroke, 75 mm adjust range, PT ports, basic mount, and magnet. For strokes of 300 mm or more, consider an external guide or a guided cylinder to manage side loads and prevent rod 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 SCJ50X125-75S FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the difference is due to the 20 mm single rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N.
The rear-cap adjusting screw sets the stroke end position within a 75 mm range, shortening the 125 mm nominal stroke. It is not a speed or force controller. For speed regulation, use external flow control valves.
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