Airtac SCJ50 Standard Cylinder SCJ50X450-100
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-100 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke450 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-100
The SCJ50X450-100 is a 50 mm bore double-acting single-rod cylinder that puts 982 N of push force at 0.5 MPa onto the rod, yet its defining feature is the rear-cap adjusting screw. With a 100 mm adjustment range, you can dial the stroke end back from the nominal 450 mm without swapping the cylinder or adding external hard stops, which is a real time-saver during commissioning and format changeovers.
This tie-rod cylinder uses a 20 mm diameter rod and PT1/4 ports, with a 21 mm air cushion at each end to decelerate the piston. The SCJ body is slightly longer than a fixed-stroke SC of the same bore to house the screw mechanism, with a base body length A(SCJ) of 194 mm. At the maximum 0.9 MPa operating pressure, it delivers 1767 N of push force.
Airtac SCJ50 Standard Cylinder SCJ50X450-100 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 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 SCJ50X450-100
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | 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 SCJ50X450-100 Is Used
Commissioning & Setup Trials
During machine bring-up, the 100 mm adjust range lets technicians dial in the exact end-of-stroke position for a 50 mm bore actuator without cutting brackets or re-drilling mounting holes.
Product Format Changeover
On a packaging line switching between box sizes, the rear screw quickly resets the pusher stroke from 450 mm down to 350 mm, avoiding a cylinder swap and keeping changeover time to minutes.
Wear Take-Up in Clamping
In a woodworking clamp, as the contact pad wears, the stroke-end screw is advanced to maintain full clamping pressure without re-machining the stop block, extending the fixture's service life.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-100 the Right Cylinder?
Step up to a 63 mm bore SCJ if your load needs more than the 50 mm's 982 N push at 0.5 MPa — the 63 offers 1559 N. If you never need to alter the stroke after installation, a fixed-stroke SC50 cylinder is a simpler, slightly shorter alternative. When replacing this unit, match the 50 mm bore, 450 mm nominal stroke, 100 mm adjust range, PT port thread, and basic mounting; the exact replacement is another SCJ50X450-100.
At 450 mm of stroke, side-loading and rod buckling become real risks. Keep the load axially aligned, or add an external guide rail. For inherently off-centre loads, consider a guided cylinder instead of a bare tie-rod unit.
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 SCJ50X450-100 FAQ
Because it is a single-rod cylinder, push and pull forces differ. At 0.5 MPa, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The adjusting screw does not change these force values.
You can, if you need the field-adjustable stroke feature. The SCJ body is slightly longer than an SC of the same nominal stroke to house the adjusting screw. Ensure the 100 mm adjustment range covers your stroke variation needs, and match the PT1/4 port thread and basic mounting style.
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