Airtac SCJ40 Standard Cylinder SCJ40X450-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø40mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-40S
The SCJ40X450-40S is a double-acting, single-rod pneumatic cylinder from AirTAC's SCJ series, featuring a rear-cap adjusting screw that provides a 40 mm field-adjustable stroke range. This allows you to fine-tune the stroke end position on your machine without swapping the cylinder. With a 40 mm bore and 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a strong mid-range actuator.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors on the barrel for reliable end-of-stroke detection. The standard PT1/4 port and M12x1.25 rod thread are standard. The cylinder's tie-rod construction is robust, and the adjustable air cushion decelerates the piston smoothly at both ends, with a 21 mm cushion length. Its body length A(SCJ) is 185 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X450-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 40 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 SCJ40X450-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ40X450-40S Is Used
Commissioning & Process Tuning
During machine setup, the 40 mm adjust range lets technicians precisely dial in the optimal stroke end for a pick-and-place or clamping operation without needing to machine custom stops or swap cylinders.
Product Format Changeover
On a packaging line, quickly adjust the stroke of a pusher or diverter arm to handle different box or product sizes, minimizing downtime between batches and eliminating the need for multiple fixed-stroke cylinders.
Wear Compensation
In a pressing or crimping application, the adjustable stroke can be periodically extended to compensate for tooling or pad wear, maintaining consistent final position and force application over the life of the consumables.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-40S the Right Cylinder?
Choose the SCJ40X450-40S when you need a mid-range force actuator with the ability to dial in the stroke end position during commissioning or for different product runs. If you require more force, stepping up to a 50 mm bore SCJ50 series provides 982 N of push force at 0.5 MPa. For applications where the stroke is fixed and will never need adjustment, the standard SC40 fixed-stroke cylinder is a more economical choice. This SCJ model is a direct dimensional and performance replacement for another AirTAC SCJ40 cylinder with a 450 mm nominal stroke, 40 mm adjust range, PT ports, and a built-in magnet. For a 450 mm stroke, be mindful of side loads; ensure the load is guided externally or consider a guided cylinder if the rod is subjected to significant lateral forces.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X450-40S FAQ
A screw mechanism in the rear cap allows you to shorten the stroke end by up to 40 mm. The cylinder's nominal maximum stroke is 450 mm, but you can field-adjust the actual stroke to any length between 410 mm and 450 mm. This adjustment only changes the end position, not the cylinder's force or speed.
At the standard operating pressure of 0.5 MPa, the SCJ40X450-40S provides a push force of 628 N and a pull force of 528 N. The push force is higher because it acts on the full 40 mm bore area, while the pull force is reduced by the area of the 16 mm piston rod. The maximum push force at 0.9 MPa is 1130 N.
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