Airtac SCJ40 Standard Cylinder SCJ40X350-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X350-50S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke350 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X350-50S
The SCJ40X350-50S is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal stroke of 350 mm, featuring a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke range. This allows fine-tuning of the stroke end position without removing the cylinder, ideal for commissioning and format changes. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, using a 16 mm diameter piston rod.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG, DMSG, or EMSG sensors on the tie-rod barrel for precise, non-contact position sensing. The cylinder body has an A(SCJ) length of 185 mm plus the nominal stroke, making it a compact yet powerful solution for automated equipment requiring variable end-stop positioning.
Airtac SCJ40 Standard Cylinder SCJ40X350-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X350-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 350 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 SCJ40X350-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SCJ40X350-50S Is Used
Commissioning & Setup
The 50 mm adjustment range lets technicians dial in the exact stroke end for a new machine during initial setup, compensating for assembly tolerances without needing to swap the cylinder.
Product Format Changeover
Quickly adapt a packaging machine's pusher stroke for different box sizes by adjusting the rear screw, minimizing downtime between production runs.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up slack as tooling or contact surfaces wear, maintaining consistent clamping force over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X350-50S the Right Cylinder?
Choose the SCJ40X350-50S when your application requires a stroke near 350 mm with the ability to fine-tune the end position by up to 50 mm. If you need more force, stepping up to a 50 mm bore provides 982 N of push force at the same pressure. For applications where the stroke is fixed and never needs adjustment, the standard SC series is a more cost-effective alternative. This cylinder is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 350 mm nominal stroke, a 50 mm adjustment range, PT ports, and a built-in magnet.
Given the 350 mm stroke, be mindful of side-loading on the 16 mm rod. If the load is not guided externally, the rod may be subject to bending moments. In such cases, use an external guide rail or consider a guided cylinder to ensure long seal life and reliable operation.
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 SCJ40X350-50S FAQ
At the standard operating pressure of 0.5 MPa, the cylinder produces 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The adjusting screw changes the stroke end position, not the force output.
It can replace an SC of the same bore and a stroke up to 350 mm, but the SCJ body is slightly longer to house the adjustment mechanism. The key advantage is the 50 mm field-adjustable range, which the fixed-stroke SC does not offer. Ensure the mounting and port threads (PT) match.
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