Airtac SCJ50 Standard Cylinder SCJ50X450-30STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X450-30STC 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 SCJ50X450-30STC
The SCJ50X450-30STC is a double-acting, single-rod pneumatic cylinder from AirTAC's tie-rod series, engineered for applications demanding mid-stroke fine-tuning. With a 50 mm bore and a nominal stroke of 450 mm, the rear-cap adjusting screw provides a 30 mm field-adjustable range to precisely dial in the stroke end position without removing the cylinder. This model delivers a push force of 982 N at 0.5 MPa and is equipped with a built-in magnet for direct mounting of CMSG/DMSG sensors.
This specific configuration includes a centre trunnion (TC) mount, supplied with the TCM1 bracket, allowing the cylinder to pivot and absorb misalignment in swinging applications. The 20 mm piston rod features an M16x1.5 male thread, and the unit includes an adjustable air cushion (21 mm length) to decelerate the piston smoothly. Operating on filtered air from 0.15 to 1.0 MPa, it uses a PT1/4 port and standard TPU seals for a temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X450-30STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X450-30STC |
|---|---|
| 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 SCJ50X450-30STC
| 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 SCJ50X450-30STC Is Used
Product Diverters & Sortation
The 30 mm adjust range allows operators to fine-tune the pusher arm's end stop for different package widths on a conveyor line without stopping production for a cylinder swap.
Clamping & Fixturing Stations
In automated welding or assembly fixtures, the adjustable stroke compensates for part tolerance variations or tooling wear, ensuring consistent clamping pressure is applied at the exact contact point.
Format Changeovers on Packaging Machines
The centre trunnion mount permits the cylinder to swing, while the rear screw quickly adjusts the stroke end for different box or carton sizes during rapid format changeovers.
Is the Airtac SCJ50 Standard Cylinder SCJ50X450-30STC the Right Cylinder?
Select the SCJ50X450-30STC when you need to commission a 450 mm stroke with up to 30 mm of end-position adjustment on a pivoting mechanism. If the force is marginal, stepping up to a 63 mm bore increases push force to 1559 N at 0.5 MPa, while a step down to 40 mm reduces it to 628 N. The adjustable stroke is ideal for format changeovers, but if your application only requires a fixed, repeatable stroke, the standard SC series is a more economical choice.
For a direct replacement, match an AirTAC SCJ cylinder with a 50 mm bore, 450 mm nominal stroke, 30 mm adjust range, centre trunnion (TC) mount, and a built-in magnet (S). At this stroke length, be mindful of side loading on the 20 mm rod; ensure the load is guided externally or consider a guided cylinder if lateral forces are present. This model uses PT threads; verify port compatibility if replacing a G-thread unit.
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 SCJ50X450-30STC FAQ
At the maximum operating pressure of 1.0 MPa, the theoretical push force is 1963 N. At a common working pressure of 0.5 MPa, the push force is 982 N. The pull force is lower (825 N at 0.5 MPa) because the 20 mm piston rod reduces the effective piston area on the return stroke.
No. The SCJ is a double-acting cylinder and will not hold its position if air pressure is lost or the directional valve is centered. The rear adjusting screw only sets the physical stroke end limit; it does not act as a brake or lock. To hold a load safely without live pressure, you must add an external rod lock or a pilot-operated check valve.
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