Airtac SCJ40 Standard Cylinder SCJ40X300-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-30S 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. Ø40mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke300 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X300-30S
The SCJ40X300-30S is a 40 mm bore, double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap screw provides up to 30 mm of stroke shortening, letting you fine-tune the end position without swapping the cylinder. It delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa, using a 16 mm diameter piston rod.
This model includes a built-in magnet (-S), allowing easy mounting of CMSG/DMSG/EMSG sensors directly on the tie-rod barrel for end-of-stroke detection. The standard PT1/4 port, TPU seals, and 21 mm air cushion make it a durable workhorse for commissioning and format-change applications. Its body length A is 185 mm plus stroke.
Airtac SCJ40 Standard Cylinder SCJ40X300-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 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 | 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 SCJ40X300-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | 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 SCJ40 Standard Cylinder SCJ40X300-30S Is Used
Commissioning & Setup
The 30 mm adjust range lets technicians quickly dial in the exact stroke end position during initial machine setup, eliminating the need to swap fixed-stroke cylinders or machine custom stops.
Format Changeover
On packaging or assembly lines, operators can adjust the stroke to accommodate different product sizes without mechanical changes. The built-in magnet provides sensor feedback for each new position.
Wear Compensation
In clamping or pressing operations, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent process force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-30S the Right Cylinder?
Choose the SCJ40 when you need the 628 N push force at 0.5 MPa that a 40 mm bore provides. If your load requires more force, step up to the SCJ50, which offers 982 N at the same pressure. For a lighter, more compact solution, the SCJ32 delivers 402 N. This adjustable-stroke model is ideal when the exact stroke length must be dialed in on the machine; if your application uses a fixed, unchanging stroke, the standard SC series is a more economical choice.
For this 300 mm nominal stroke, be mindful of side loads. The 16 mm rod can experience bending under high lateral forces at full extension. To prevent premature seal wear or rod damage, use an external guide rail or consider a guided cylinder assembly. A direct replacement must match the 40 mm bore, 300 mm nominal stroke, 30 mm adjust range, PT ports, and the -S magnet option.
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 SCJ40 Standard Cylinder SCJ40X300-30S FAQ
A rear-cap adjusting screw limits the piston's retraction, effectively shortening the stroke end by up to 30 mm from the 300 mm nominal maximum. It does not change the cylinder's force or speed—it only sets the mechanical stop position for the stroke.
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (due to the 16 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force increases to 1130 N. Always use the pull force value when calculating the return stroke capacity.
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