Airtac SCJ50 Standard Cylinder SCJ50X450-30
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 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-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X450-30
The SCJ50X450-30 is a double-acting, single-rod pneumatic cylinder that puts stroke-end adjustment directly on the machine. A rear-cap adjusting screw lets you shorten the nominal 450 mm stroke by up to 30 mm in the field, which is invaluable during commissioning, format changeovers, or when taking up wear in a mechanical stop. With a 20 mm piston rod and PT1/4 ports, it delivers 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa.
This 50 mm bore model uses a tie-rod construction with a 21 mm air cushion to decelerate the piston quietly. The body length A(SCJ) is 194 mm, making it slightly longer than a fixed-stroke SC of the same bore. It runs on filtered air from 0.15 to 1.0 MPa and handles ambient temperatures from -20 to +70 °C with its standard TPU seals. The 450 mm stroke is well within the 1200 mm maximum for this bore size.
Airtac SCJ50 Standard Cylinder SCJ50X450-30 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 30 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 SCJ50X450-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ50X450-30 Is Used
Commissioning & Setup
During machine commissioning, the 30 mm adjustment range allows technicians to fine-tune the stroke end without removing the cylinder or machining external stops, speeding up the debug process.
Format Changeover
On packaging lines that switch between product sizes, the adjustable stroke lets operators quickly reset the push or stop position to match a new box or tray dimension.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced over time to compensate for wear on tooling or seals, maintaining consistent clamp force without replacing parts.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-30 the Right Cylinder?
Choose the SCJ50X450-30 when you need to dial in the end position of a 450 mm stroke without swapping cylinders. If your force requirement is lower, the 40 mm bore SCJ delivers 628 N push at 0.5 MPa; for a heavier load, the 63 mm bore provides 1559 N. Because this is a single-rod cylinder, push force is higher than pull force—plan your return stroke load accordingly. At 450 mm of stroke, side-loading can cause rod bending; if the load is not guided, pair the cylinder with an external guide rail or consider a guided cylinder. For a direct replacement, match the 50 mm bore, 450 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting. If you need position sensing, the -S magnet option allows CMSG/DMSG/EMSG sensors to clamp onto the barrel.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ50X450-30 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. The theoretical force at 1.0 MPa is 200 kgf. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the return side.
Yes, the SCJ50X450-30 shares the same bore, rod diameter, port size, and mounting footprint as the SC50 series. The body is slightly longer to accommodate the adjusting screw. You can use it as a direct replacement if you need the 30 mm stroke-end adjustment range. Ensure your mounting brackets and port connections match the PT1/4 thread.
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