Airtac SCJ50 Standard Cylinder SCJ50X450-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-40
The SCJ50X450-40 is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 450 mm stroke, giving you a 40 mm field-adjustable range via the rear-cap screw. This puts the stroke-end fine-tuning directly on the machine, so you can dial in the exact stop position during commissioning or changeover without swapping the cylinder. At 0.5 MPa it delivers 982 N push and 825 N pull, and at the maximum operating pressure of 0.9 MPa the push force reaches 1767 N.
Built on the proven SC tie-rod platform, the SCJ adds a stroke-adjust mechanism that shortens the stroke end by up to 40 mm. The 20 mm diameter piston rod runs through a 21 mm air cushion for smooth deceleration, and the PT1/4 port keeps plumbing straightforward. The body length A(SCJ) is 194 mm plus stroke, making it slightly longer than a fixed-stroke SC of the same bore. This model is a genuine AirTAC unit, ready for applications where a repeatable, adjustable end-stop matters more than a fixed stroke.
Airtac SCJ50 Standard Cylinder SCJ50X450-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 40 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 SCJ50X450-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X450-40 Is Used
Multi-Product Assembly Jigs
A 450 mm stroke with 40 mm of adjustment lets a single fixture handle product variants of different lengths. Operators tweak the screw to set the final clamp or press position for each batch, eliminating the need for mechanical shims or multiple fixed-stroke cylinders.
End-Stop Wear Compensation
On a long-stroke pusher or diverter, mechanical stops can wear over thousands of cycles. The 40 mm adjust range allows maintenance teams to dial the cylinder end position back to the exact target without replacing the stop or the cylinder, keeping the line in spec.
Commissioning & Process Tuning
During machine bring-up, the ideal actuator stroke is often an estimate. The SCJ50X450-40 lets controls engineers incrementally adjust the stroke end from 410 mm to 450 mm while the machine runs, locking in the optimal motion profile before full production.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-40 the Right Cylinder?
Choose the SCJ50 when you need the 982 N push force class and the ability to trim the stroke end on-site. If your load requires more force, step up to the 63 mm bore SCJ63, which delivers 1559 N push at 0.5 MPa. For applications where the stroke never needs adjustment, the fixed-stroke SC50 is a simpler, slightly shorter alternative. When replacing an existing SCJ50X450-40, match the 50 mm bore, 450 mm nominal stroke, 40 mm adjust range, PT thread, and basic mounting. At 450 mm of stroke, be mindful of side loading—if the rod sees any lateral force, add an external linear guide or consider a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X450-40 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 40 mm stroke adjustment does not change the force output.
Only if you need the adjustable stroke feature. The SCJ body is slightly longer (A=194 mm plus stroke) to house the adjusting screw. You must match the 50 mm bore, 450 mm nominal stroke, PT1/4 port, and basic mounting. If your current SC50 has a magnet or different mount, order the corresponding suffix (e.g., SCJ50X450-40S for magnet).
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