Airtac SCJ50 Standard Cylinder SCJ50X120-50
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 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-50 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X120-50
The SCJ50X120-50 is a double-acting, single-rod pneumatic cylinder that delivers 982 N of push force at 0.5 MPa, stepping up to 1767 N at the maximum operating pressure of 0.9 MPa. Its defining feature is the rear-cap adjusting screw, which provides a 50 mm range to fine-tune the stroke end position without removing the cylinder from the machine, making it invaluable for commissioning and process tweaks.
This 50 mm bore model uses a 20 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion of 21 mm at each end to decelerate the piston smoothly. The SCJ body length for this bore is 194 mm, slightly longer than a fixed-stroke SC to house the adjustment mechanism, and it is built for standard strokes up to 1200 mm.
Airtac SCJ50 Standard Cylinder SCJ50X120-50 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 50 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 SCJ50X120-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ50X120-50 Is Used
Commissioning & Setup
Field engineers can dial in the exact 120 mm stroke end position with the 50 mm adjustment screw during initial machine setup, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error fitting.
Product Changeover
On packaging or assembly lines, the adjustable stroke allows operators to quickly adapt the cylinder's end-stop for different product sizes or formats without mechanical modifications, reducing downtime between batches.
Wear Compensation
In clamping or pressing fixtures, the 50 mm adjustment range can be used to take up mechanical wear in tooling or workpieces over time, maintaining consistent contact force without replacing the actuator.
Is the Airtac SCJ50 Standard Cylinder SCJ50X120-50 the Right Cylinder?
Choose the SCJ50X120-50 when your application demands a nominal 120 mm stroke with the ability to dial it back by up to 50 mm on-site. If your force calculation falls short, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa; if you need a lighter, more compact unit, the 40 mm bore offers 628 N. For a direct replacement, match the 50 mm bore, 120 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting configuration exactly.
Should your design require a fixed, non-adjustable stroke for high-cycle consistency, the standard SC series is a better fit. For strokes of 300 mm or more, always evaluate side-loading on the 20 mm rod; an external guide rail or a switch to a guided cylinder will protect the rod bearings and seals from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ50X120-50 FAQ
At 0.5 MPa, this single-rod cylinder generates 982 N pushing and 825 N pulling due to the rod area difference. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 2000 N (200 kgf).
A rear adjusting screw lets you shorten the stroke end by up to 50 mm from the 120 mm nominal maximum. It is a direct dimensional replacement for another AirTAC SCJ50X120-50 with the same adjust range, port, and mounting, but it is not a drop-in substitute for a fixed-stroke SC50X120, as the SCJ body is longer to accommodate the screw mechanism.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ50 Standard Cylinder SCJ50X120-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.