Airtac SCJ40 Standard Cylinder SCJ40X450-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X450-75S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke450 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X450-75S
The SCJ40X450-75S is a single-rod double-acting pneumatic cylinder with a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. At 0.5 MPa, it delivers 628 N of push force and 528 N of pull force, making it suitable for mid-range linear tasks where the end position needs fine-tuning without replacing the cylinder.
This model features a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors for reliable end-of-stroke detection. The 16 mm diameter rod and PT1/4 port ensure a robust connection, while the adjustable air cushion decelerates the piston smoothly over the final 21 mm of travel.
Airtac SCJ40 Standard Cylinder SCJ40X450-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X450-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 450 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 SCJ40X450-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×450 | 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 SCJ40X450-75S Is Used
Commissioning & Setup
Engineers can precisely dial in the stroke end position during machine commissioning without cutting or swapping hard stops, saving significant setup time on packaging lines.
Format Changeovers
Quickly adjust the push stroke for different box sizes on a case packer. The 75 mm adjustment range accommodates multiple product formats with a single cylinder.
Wear Compensation
In clamping or pressing fixtures, the screw can be advanced over time to compensate for tooling or pad wear, maintaining consistent clamping force without reprogramming.
Is the Airtac SCJ40 Standard Cylinder SCJ40X450-75S the Right Cylinder?
Choose the SCJ40 when you need to adjust the stroke end position on the fly during commissioning or format changeovers. If you require more force, stepping up to the SCJ50 provides 982 N of push force at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice. A direct replacement must match the 40 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet for sensor compatibility. With a 450 mm stroke, consider an external guide rail or a guided cylinder if the load applies significant side force, to prevent rod bending and ensure long seal life.
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 SCJ40X450-75S FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 1256 N.
Yes, the SCJ40X450-75S shares the same bore, port, and mounting dimensions as the SC series. You can replace a fixed-stroke cylinder with this adjustable-stroke version to gain on-machine stroke tuning. Ensure your mounting and sensor setup is compatible, and note the SCJ body is slightly longer to house the adjusting mechanism.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCJ Adjustable-Stroke Cylinders
Request a Quote for Airtac SCJ40 Standard Cylinder SCJ40X450-75S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.