Airtac SCJ50 Standard Cylinder SCJ50X300-30STC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-30STC 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke300 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X300-30STC
The SCJ50X300-30STC provides a nominal 300 mm stroke with a 30 mm rear-end adjustment range, letting you dial in the exact stroke end position on the fly without swapping cylinders. This 50 mm bore double-acting, single-rod cylinder delivers 982 N of push force at 0.5 MPa and up to 1767 N at 0.9 MPa, making it a solid mid-range actuator for tasks that need field-tunable motion.
This model is factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion (TC) mount that ships with the TCM1 bracket for pivoting applications. The 20 mm rod and PT1/4 ports keep it compatible with standard AirTAC SCJ accessories, while the 21 mm air cushion at each end protects the assembly from hard end-of-stroke impacts.
Airtac SCJ50 Standard Cylinder SCJ50X300-30STC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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 SCJ50X300-30STC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SCJ50X300-30STC Is Used
Commissioning & Setup
The 30 mm rear screw adjustment allows technicians to precisely set the retract end position during machine commissioning, eliminating the need for shims or external hard stops.
Format Changeovers
On packaging or assembly lines, quickly adapt the stroke end for different product sizes or tooling setups without changing the cylinder, reducing downtime between batches.
Wear Compensation
In high-cycle applications, the adjustable stroke can be tweaked over time to compensate for wear in grippers, linkages, or tooling, maintaining consistent clamping or positioning performance.
Is the Airtac SCJ50 Standard Cylinder SCJ50X300-30STC the Right Cylinder?
Choose the SCJ50X300-30STC when you need a 50 mm bore with a 300 mm stroke and the ability to fine-tune the retract end position by up to 30 mm. If your force requirement is lower, the 40 mm bore SCJ delivers 628 N push at 0.5 MPa; for more force, step up to the 63 mm bore which provides 1559 N push at the same pressure. For this 300 mm stroke, be mindful of side-loading on the rod—if the load is not guided, consider an external guide rail or a guided cylinder to prevent rod bending and premature seal wear.
As a direct replacement, match the SCJ50 bore, the 300 mm nominal stroke, the 30 mm adjustment range, the centre trunnion mount (F-SC50TC), the PT port thread, and the magnet option. A fixed-stroke SC cylinder is a better pick if your application never requires stroke-end adjustment and you want a simpler, slightly more compact body.
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 SCJ50X300-30STC FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N. Always size for the lower pull force if the cylinder works in both directions.
A rear-cap screw sets the retract stroke end position within a 30 mm range from the nominal 300 mm stroke. It does not change the bore or force. Use the SCJ if you need field-adjustable stroke ends for setup or changeovers; choose a fixed-stroke SC if your stroke is permanently fixed and you prefer a slightly shorter body length.
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