Airtac SCJ40 Standard Cylinder SCJ40X300-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke300 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X300-50
The SCJ40X300-50 delivers a nominal 300 mm stroke with a 50 mm rear-end adjustable range, letting you dial in the exact stop position without swapping the cylinder. Its 40 mm bore and 16 mm rod generate 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa), making it a solid mid-range actuator for tasks that need field-tunable end positions.
This double-acting, single-rod cylinder uses a tie-rod construction with PT1/4 ports and an M12x1.25 rod thread. The 21 mm air cushion at each end decelerates the piston quietly, while the rear adjusting screw shortens the stroke end by up to 50 mm—ideal for commissioning tweaks or format changeovers on packaging and assembly lines.
Airtac SCJ40 Standard Cylinder SCJ40X300-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SCJ40 Standard Cylinder SCJ40X300-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40 Standard Cylinder SCJ40X300-50 Is Used
Commissioning & Setup
The 50 mm rear adjustment lets technicians fine-tune the stroke end position during initial machine setup without removing the cylinder or adding external hard stops, speeding up line commissioning.
Format Changeovers
On packaging lines that switch between product sizes, the adjustable stroke allows operators to quickly reset the push or clamp distance from 250 mm down to 300 mm, minimizing downtime between batches.
Wear Compensation
In pressing or clamping fixtures, the screw adjuster can be advanced over time to compensate for tooling or pad wear, maintaining consistent contact force without reprogramming the machine controller.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-50 the Right Cylinder?
Step up to the 50 mm bore SCJ50 series if your load exceeds 628 N push at 0.5 MPa; the SCJ50 provides 982 N at the same pressure. For fixed-stroke applications where no field adjustment is needed, the standard SC40 cylinder is a simpler, lighter alternative. If the 300 mm stroke introduces side-loading concerns, consider an external guide rail or a guided cylinder to protect the rod bearing.
This model replaces any AirTAC SCJ40X300-50 with PT ports and basic mounting. When ordering a direct replacement, match the 40 mm bore, 300 mm nominal stroke, 50 mm adjustment range, and port thread. Mounting accessories from the SCJ subset—FA front flange, LB foot, or TC centre trunnion—can be added using the F-SC40 prefix.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-50)
- ✓ 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 SCJ40 Standard Cylinder SCJ40X300-50 FAQ
At 0.5 MPa, the 40 mm bore generates 628 N pushing and 528 N pulling (the difference is due to the 16 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. Always size your load below 50-70% of the theoretical force for reliable dynamic operation.
Yes, provided the extra body length for the adjusting screw fits your machine envelope. The SCJ40X300-50 has the same bore, port, and mounting interface as the SC40. The key difference is the rear screw that shortens the stroke end by up to 50 mm, giving you field adjustability that the fixed SC40 does not offer.
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