Airtac SCJ40 Standard Cylinder SCJ40X300-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-50S 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 SCJ40X300-50S
The SCJ40X300-50 is a 40 mm bore double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range. This lets you fine-tune the stroke end position without swapping the cylinder, making it ideal for commissioning trials and format changeovers. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, with a 16 mm diameter piston rod and PT1/4 ports.
The cylinder body length A is 185 mm, and the adjustable air cushion decelerates the piston smoothly at each end. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the tie-rod barrel for reliable end-of-stroke detection. The nominal 300 mm stroke is well within the 1200 mm maximum standard stroke for this bore size.
Airtac SCJ40 Standard Cylinder SCJ40X300-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-50S |
|---|---|
| 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 SCJ40X300-50S
| 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 SCJ40X300-50S Is Used
Commissioning & Setup
The 50 mm adjustment screw lets technicians dial in the precise stop position during initial machine commissioning without changing hard stops or cylinder mounts.
Format Changeovers
Quickly adapt the stroke end for different product sizes on packaging or sorting lines by simply turning the rear adjusting screw, minimizing downtime.
Wear Compensation
As tooling or gripper pads wear over time, the adjustable stroke can be extended slightly to maintain consistent contact and part engagement.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-50S the Right Cylinder?
Choose the SCJ40X300-50 when you need to dial in the exact stroke end position during machine setup or after tooling wear. If your force requirement is lower, the 32 mm bore SCJ32 series provides 402 N of push force at 0.5 MPa; for more force, the 50 mm bore SCJ50 series offers 982 N. This adjustable-stroke model is the right pick over a fixed-stroke SC cylinder when the application demands on-machine stroke tuning without dismounting the cylinder.
For a direct replacement, match the 40 mm bore, 300 mm nominal stroke, 50 mm adjustment range, PT port thread, and the built-in magnet. At a 300 mm stroke, ensure the rod is not subjected to high side loads; if lateral forces are present, add an external guide rail 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 (-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 SCJ40X300-50S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area on the piston.
Yes, it can replace a fixed-stroke SC40X300 if you need the added benefit of a 50 mm field-adjustable stroke range. The mounting footprint, port size (PT1/4), and force output are identical. Ensure the slightly longer body length for the adjusting screw mechanism fits your machine envelope.
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