Airtac SCJ50 Standard Cylinder SCJ50X120-100S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke120 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-100S
The SCJ50X120-100S is a 50 mm bore double-acting single-rod cylinder with a generous 100 mm rear-end stroke adjustment, letting you dial in the exact stroke end position from 20 mm up to the full 120 mm nominal length. Its 20 mm diameter piston rod and PT1/4 ports deliver a robust 982 N push force at 0.5 MPa, making it a workhorse for mid-range pneumatic tasks that need frequent fine-tuning.
This model includes a built-in magnet, so you can clip CMSG, DMSG, or EMSG reed and solid-state sensors directly onto the tie-rod barrel for reliable end-of-stroke or mid-stroke position feedback. The standard TPU seal and PT thread keep it compatible with most factory air systems, and the 21 mm air cushion at each end protects the end caps during high-cycle operation.
Airtac SCJ50 Standard Cylinder SCJ50X120-100S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 100 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 SCJ50X120-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ50X120-100S Is Used
Commissioning & Setup
Fine-tune the end stop during initial machine run-off without disconnecting air lines or removing the cylinder, saving hours of mechanical adjustment time.
Format Changeovers
Quickly adapt the stroke for different product sizes on a packaging or sorting line by turning the rear screw, eliminating the need for multiple fixed-stroke cylinders.
Wear Compensation
Take up mechanical play in linkages or compensate for gradual tooling wear by extending the effective stroke, maintaining consistent process quality over long production runs.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-100S the Right Cylinder?
Choose the SCJ50X120-100S when you need to commission a machine with a variable stroke end or accommodate wear on tooling without swapping the cylinder. If 982 N push force is marginal, stepping up to the 63 mm bore provides 1559 N at the same 0.5 MPa; if space is tight, the 40 mm bore delivers 628 N. For a fixed, non-adjustable stroke, the standard SC series is a simpler and more cost-effective alternative. This cylinder is a direct replacement for any AirTAC SCJ50X120-100S with a PT port, basic mount, and magnet.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ50X120-100S FAQ
At the standard 0.5 MPa operating pressure, the cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The rear adjusting screw changes only the stroke end position, not the output force.
The rear cap screw mechanically limits how far the piston retracts, giving you an adjustable stroke end within a 100 mm range. Use the SCJ when your application needs field-tunable stroke length for setup, format changes, or wear take-up. Choose a standard SC cylinder if your stroke requirement is fixed and will never need adjustment.
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