Airtac SCJ40 Standard Cylinder SCJ40X300-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X300-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 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-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X300-75S
The SCJ40X300-75S is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke-end reduction. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa, making it a practical workhorse for mid-range pneumatic positioning tasks.
This model includes a built-in magnet (-S), allowing direct mounting of CMSG/DMSG/EMSG sensors for end-of-stroke detection without external brackets. The PT1/4 ports and M12x1.25 rod thread are standard, and the 21 mm air cushion decelerates the piston smoothly. The body length A(SCJ) is 185 mm, slightly longer than the fixed-stroke SC due to the adjusting mechanism.
Airtac SCJ40 Standard Cylinder SCJ40X300-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X300-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 75 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 SCJ40X300-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ40X300-75S Is Used
Commissioning & Setup
The 75 mm adjustment range lets technicians dial in the exact stroke end during machine commissioning, accommodating build tolerances without re-machining end stops.
Product Format Changeover
Quickly adapt the stroke for different product sizes on a packaging line. The rear screw adjusts the stop position in seconds, minimizing downtime between batches.
Wear Compensation
As tooling or gripper pads wear over time, the adjustable stroke can be extended slightly to maintain consistent contact pressure and part engagement.
Is the Airtac SCJ40 Standard Cylinder SCJ40X300-75S the Right Cylinder?
Choose the SCJ40X300-75S when you need to fine-tune a 300 mm stroke on the machine without swapping cylinders. The 75 mm adjustment range is ideal for commissioning trials or format changeovers. If 628 N of push force at 0.5 MPa is insufficient, stepping up to a 50 mm bore (SCJ50) provides 982 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a simpler alternative.
At a 300 mm stroke, consider side-loading and rod bending. If the load is not guided, use an external guide rail or switch to a guided cylinder to protect the rod and seals. For direct replacement, match the 40 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT1/4 ports, and the -S magnet option. This model uses basic mounting; add FA, LB, or TC mounts if needed.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ40X300-75S 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. The pull force is lower because the 16 mm rod reduces the effective piston area on the return stroke.
A screw in the rear cap sets the stroke end position. You can shorten the nominal 300 mm stroke by up to 75 mm. It does not change the cylinder's force or speed—it only limits how far the piston extends, acting as a built-in, fine-tunable end stop.
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